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Xu Y, Liu D, Wang M. Enhancing Gating Performance in Organic Molecular Field-Effect Transistors by Introducing Polar Azulene Components. Chemistry 2023; 29:e202301294. [PMID: 37589330 DOI: 10.1002/chem.202301294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Revised: 08/16/2023] [Accepted: 08/17/2023] [Indexed: 08/18/2023]
Abstract
Organic molecular field-effect transistors (FETs) are promising building components for future electronic circuits. Efficient control of charge transport properties is one key issue in the design of organic molecular FETs. In this study, we propose a redesign of a naphthalene-based FET by introducing two azulene components in opposite dipole moment directions. Using density functional theory combined with non-equilibrium Green's function, the simulated electronic transport characteristics reveal that the introduction of polar azulene components effectively narrows the frontier molecular orbitals gap, leading to an increase in the ON-state current. Meanwhile, the OFF-state current is significantly suppressed by highly localizing the dominant electronic transport channel. As a result, improved gate controllability is achieved with a higher ON-OFF current ratio, which is nearly seven times higher than that of the naphthalene-based FET device. These findings provide theoretical directions for future design of organic molecular FET devices with enhanced gating regulation efficiency.
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Affiliation(s)
- Yuqing Xu
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai, 264025, P. R. China
| | - Desheng Liu
- School of Physics, Shandong University, Jinan, 250100, P. R. China
- Department of Physics, Jining University, Ji Ning Shi, Qufu, 273155, P. R. China
| | - Meishan Wang
- School of Integrated Circuits, Ludong University, Yantai, 264025, P. R. China
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2
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Chen J, Subotnik JE. A Dynamically Weighted Constrained Complete Active Space Ansatz for Constructing Multiple Potential Energy Surfaces within the Anderson-Holstein Model. J Chem Theory Comput 2023. [PMID: 37399506 DOI: 10.1021/acs.jctc.3c00327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/05/2023]
Abstract
We derive and implement the necessary equations for solving a dynamically weighted, state-averaged constrained CASSCF(2,2) wave function describing a molecule on a metal surface, where we constrain the overlap between two active orbitals and the impurity atomic orbitals to be a finite number. We show that a partial constraint is far more robust than a full constraint. We further calculate the system-bath electronic couplings that arise because, near a metal, there is a continuum (rather than discrete) number of electronic states. This approach should be very useful for simulating heterogeneous electron transfer and electrochemical dynamics going forward.
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Affiliation(s)
- Junhan Chen
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Joseph E Subotnik
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
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3
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Chen J, Subotnik J. Nonadiabatic Potential Energy Surfaces for a Molecule on a Surface as Found by Constrained Complete Active Space Theory. J Phys Chem Lett 2023:5665-5673. [PMID: 37311218 DOI: 10.1021/acs.jpclett.3c00777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
In order to study electron-transfer mediated chemical processes on a metal surface, one requires not one but two potential energy surfaces (one ground state and one excited state) as in Marcus theory. In this letter, we report that a novel, dynamically weighted, state-averaged constrained CASSCF(2,2) (DW-SA-cCASSCF(2,2)) can produce such surfaces for the Anderson impurity model. Both ground and excited state potentials are smooth, they incorporate states with a charge transfer character, and the accuracy of the ground state surface can be verified for some model problems by renormalization group theory. Future development of gradients and nonadiabatic derivative couplings should allow for the study of nonadiabatic dynamics for molecules near metal surfaces.
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Affiliation(s)
- Junhan Chen
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Joseph Subotnik
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
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4
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Xu Y, Zhao W, Zou D, Li X, Qin M, Wang C, Liu D, Wang M. Effects of Inorganic Substitutions and Different Metal Electrode Materials on Electronic Transport Properties of Organic Molecular Devices. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023. [PMID: 37307594 DOI: 10.1021/acs.langmuir.3c00773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Incorporating inorganic components into organic molecular devices offers one novel alternative to address challenges existing in the fabrication and integration of nanoscale devices. In this study, using a theoretical method of density functional theory combined with the nonequilibrium Green's function, a series of benzene-based molecules with group III and V substitutions, including borazine molecule and XnB3-nN3H6 (X = Al or Ga, n = 1-3) molecules/clusters, are constructed and investigated. An analysis of electronic structures reveals that the introduction of inorganic components effectively reduces the energy gap between the highest occupied molecular orbital and the lowest unoccupied molecular orbital, albeit at the cost of reduced aromaticity in these molecules/clusters. Simulated electronic transport characteristics demonstrate that XnB3-nN3H6 molecules/clusters coupled between metal electrodes exhibit lower conductance compared to prototypical benzene molecule. Additionally, the choice of metal electrode materials significantly impacts the electronic transport properties, with platinum electrode devices displaying distinct behavior compared to silver, copper, and gold electrode devices. This distinction arises from the amount of transferred charge, which modulates the alignment between molecular orbitals and the Fermi level of the metal electrodes by shifting the molecular orbitals in energy. These findings provide valuable theoretical insights for the future design of molecular devices incorporating inorganic substitutions.
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Affiliation(s)
- Yuqing Xu
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, P. R. China
| | - Wenkai Zhao
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, P. R. China
| | - Dongqing Zou
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, P. R. China
| | - Xiaoteng Li
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, P. R. China
| | - Ming Qin
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, P. R. China
| | - Chunyang Wang
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, P. R. China
| | - Desheng Liu
- School of Physics, Shandong University, Jinan 250100, P. R. China
- Department of Physics, Jining University, Qufu 273155, P. R. China
| | - Meishan Wang
- College of Integrated Circuits, Ludong University, Yantai 264025, P. R. China
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5
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Ojeda JH, Piracón Muñoz LK, Guerra Pinzón JA, Gómez Castaño JA. 1,4-Dithiolbenzene, 1,4-dimethanediolbenzene and 4-thioacetylbiphenyl molecular systems: electronic devices with possible applications in molecular electronics. RSC Adv 2020; 10:32127-32136. [PMID: 35518157 PMCID: PMC9056573 DOI: 10.1039/d0ra05605g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Accepted: 08/17/2020] [Indexed: 11/21/2022] Open
Abstract
A theoretical study of the electronic transport properties of the 1,4-dithiolbenzene, 1,4-dimethanediolbenzene and 4-thioacetylbiphenyl molecules coupled to two metal contacts is carried out.
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Affiliation(s)
- J. H. Ojeda
- Grupo de Física de Materiales
- Universidad Pedagógica y Tecnológica de Colombia
- Tunja
- Colombia
- Laboratorio de Química Teórica y Computacional
| | - Lina K. Piracón Muñoz
- Laboratorio de Química Teórica y Computacional
- Grupo de Investigación Química-Física Molecular y Modelamiento Computacional (QUIMOL)
- Facultad de Ciencias
- Universidad Pedagógica y Tecnológica de Colombia
- Tunja
| | - Julian A. Guerra Pinzón
- Laboratorio de Química Teórica y Computacional
- Grupo de Investigación Química-Física Molecular y Modelamiento Computacional (QUIMOL)
- Facultad de Ciencias
- Universidad Pedagógica y Tecnológica de Colombia
- Tunja
| | - Jovanny A. Gómez Castaño
- Laboratorio de Química Teórica y Computacional
- Grupo de Investigación Química-Física Molecular y Modelamiento Computacional (QUIMOL)
- Facultad de Ciencias
- Universidad Pedagógica y Tecnológica de Colombia
- Tunja
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6
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Chen J, Kim M, Gathiaka S, Cho SJ, Kundu S, Yoon HJ, Thuo MM. Understanding Keesom Interactions in Monolayer-Based Large-Area Tunneling Junctions. J Phys Chem Lett 2018; 9:5078-5085. [PMID: 30126267 DOI: 10.1021/acs.jpclett.8b01731] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Charge transport across self-assembled monolayers (SAMs) has been widely studied. Discrepancies of charge tunneling data that arise from various studies, however, call for efforts to develop new statistical analytical approaches to understand charge tunneling across SAMs. Structure-property studies on charge tunneling across SAM-based junctions have largely been through comparison of average tunneling rates and associated variance. These early moments (especially the average) are dominated by barrier width-a static property of the junction. In this work, we show that analysis of higher statistical moments (skewness and kurtosis) reveals the dynamic nature of the tunnel junction. Intramolecular Keesom (dipole-dipole) interactions dynamically fluctuate with bias as dictated by stereoelectronic limitations. Analyzing variance in the distribution of tunneling data instead of the first statistical moment (average), for a series of n-alkanethiols containing internal amide and aromatic terminal groups, we observe that the direction of dipole moments affects molecule-electrode coupling. An applied bias induces changes in the tunneling probability, affecting the distribution of tunneling paths in large-area molecular junctions.
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Affiliation(s)
- Jiahao Chen
- Department of Materials Science and Engineering , Iowa State University , Ames , Iowa 50010 , United States
| | - Miso Kim
- Department of Chemistry , Korea University , Seongbuk-gu , Seoul 02841 , South Korea
| | - Symon Gathiaka
- School of Pharmacy and Pharmaceutical Science , University of California , La Jolla , California 92093-0657 , United States
| | - Soo Jin Cho
- Department of Chemistry , Korea University , Seongbuk-gu , Seoul 02841 , South Korea
| | - Souvik Kundu
- Department of Electrical and Computer Engineering , Iowa State University , Ames , Iowa 50010 , United States
| | - Hyo Jae Yoon
- Department of Chemistry , Korea University , Seongbuk-gu , Seoul 02841 , South Korea
| | - Martin M Thuo
- Department of Materials Science and Engineering , Iowa State University , Ames , Iowa 50010 , United States
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7
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Chen J, Giroux TJ, Nguyen Y, Kadoma AA, Chang BS, VanVeller B, Thuo MM. Understanding interface (odd–even) effects in charge tunneling using a polished EGaIn electrode. Phys Chem Chem Phys 2018; 20:4864-4878. [DOI: 10.1039/c7cp07531f] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Charge transport across large area molecular tunneling junctions is widely studied due to its potential in the development of quantum electronic devices.
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Affiliation(s)
- Jiahao Chen
- Department of Materials Science and Engineering
- Iowa State University
- Ames
- USA
| | - Thomas J. Giroux
- Department of Mechanical Engineering
- Iowa State University
- Ames
- USA
| | - Yen Nguyen
- Department of Chemistry
- Iowa State University
- Ames
- USA
| | - Atte A. Kadoma
- Department of Materials Science and Engineering
- Iowa State University
- Ames
- USA
| | - Boyce S. Chang
- Department of Materials Science and Engineering
- Iowa State University
- Ames
- USA
| | | | - Martin M. Thuo
- Department of Materials Science and Engineering
- Iowa State University
- Ames
- USA
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8
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Stevens TE, Pearce CJ, Whitten CN, Grant RP, Monson TC. Self-Assembled Array of Tethered Manganese Oxide Nanoparticles for the Next Generation of Energy Storage. Sci Rep 2017; 7:44191. [PMID: 28287183 PMCID: PMC5347033 DOI: 10.1038/srep44191] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Accepted: 02/03/2017] [Indexed: 11/09/2022] Open
Abstract
Many challenges must be overcome in order to create reliable electrochemical energy storage devices with not only high energy but also high power densities. Gaps exist in both battery and supercapacitor technologies, with neither one satisfying the need for both large power and energy densities in a single device. To begin addressing these challenges (and others), we report a process to create a self-assembled array of electrochemically active nanoparticles bound directly to a current collector using extremely short (2 nm or less) conductive tethers. The tethered array of nanoparticles, MnO in this case, bound directly to a gold current collector via short conducting linkages eliminates the need for fillers, resulting in a material which achieves 99.9% active material by mass (excluding the current collector). This strategy is expected to be both scalable as well as effective for alternative tethers and metal oxide nanoparticles.
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Affiliation(s)
- Tyler E. Stevens
- Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Charles J. Pearce
- Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Caleah N. Whitten
- Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Richard P. Grant
- Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Todd C. Monson
- Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
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9
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Energy-filtered Electron Transport Structures for Low-power Low-noise 2-D Electronics. Sci Rep 2016; 6:36167. [PMID: 27796343 PMCID: PMC5086915 DOI: 10.1038/srep36167] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Accepted: 10/07/2016] [Indexed: 11/15/2022] Open
Abstract
In addition to cryogenic techniques, energy filtering has the potential to achieve high-performance low-noise 2-D electronic systems. Assemblies based on graphene quantum dots (GQDs) have been demonstrated to exhibit interesting transport properties, including resonant tunnelling. In this paper, we investigate GQDs based structures with the goal of producing energy filters for next generation lower-power lower-noise 2-D electronic systems. We evaluate the electron transport properties of the proposed GQD device structures to demonstrate electron energy filtering and the ability to control the position and magnitude of the energy passband by appropriate device dimensioning. We also show that the signal-to-thermal noise ratio performance of the proposed nanoscale device can be modified according to device geometry. The tunability of two-dimensional GQD structures indicates a promising route for the design of electron energy filters to produce low-power and low-noise electronics.
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10
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Stuyver T, Fias S, De Proft F, Fowler PW, Geerlings P. Conduction of molecular electronic devices: Qualitative insights through atom-atom polarizabilities. J Chem Phys 2015; 142:094103. [DOI: 10.1063/1.4913415] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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11
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Theoretical study of conformational effect on electronic structure and charge transfer in silabiphenyl system. COMPUT THEOR CHEM 2015. [DOI: 10.1016/j.comptc.2014.11.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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12
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Abstract
Scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) can characterize intriguing nanoparticle properties towards solid-state nanodevices.
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Affiliation(s)
- Shinya Kano
- Materials and Structures Laboratory
- Tokyo Institute of Technology
- Yokohama 226-8503
- Japan
| | - Tsukasa Tada
- Materials and Structures Laboratory
- Tokyo Institute of Technology
- Yokohama 226-8503
- Japan
| | - Yutaka Majima
- Materials and Structures Laboratory
- Tokyo Institute of Technology
- Yokohama 226-8503
- Japan
- Department of Printed Electronics Engineering
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13
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Tada T, Yoshizawa K. Molecular design of electron transport with orbital rule: toward conductance-decay free molecular junctions. Phys Chem Chem Phys 2015; 17:32099-110. [DOI: 10.1039/c5cp05423k] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this study, we report our viewpoint of single molecular conductance in terms of frontier orbitals.
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Affiliation(s)
- Tomofumi Tada
- Materials Research Center for Element Strategy
- Tokyo Institute of Technology
- Yokohama 226-8503
- Japan
| | - Kazunari Yoshizawa
- Institute for Materials Chemistry and Engineering
- Kyushu University
- Fukuoka 819-0395
- Japan
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14
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Zhang JL, Zhong JQ, Lin JD, Hu WP, Wu K, Xu GQ, Wee ATS, Chen W. Towards single molecule switches. Chem Soc Rev 2015; 44:2998-3022. [DOI: 10.1039/c4cs00377b] [Citation(s) in RCA: 247] [Impact Index Per Article: 27.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Scanning tunneling microscope (STM) controlled reversible switching of a single-dipole molecule imbedded in hydrogen-bonded binary molecular networks on graphite.
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Affiliation(s)
- Jia Lin Zhang
- Department of Chemistry
- National University of Singapore
- Singapore
- Department of Physics
- National University of Singapore
| | - Jian Qiang Zhong
- Department of Chemistry
- National University of Singapore
- Singapore
- Department of Physics
- National University of Singapore
| | - Jia Dan Lin
- Department of Chemistry
- National University of Singapore
- Singapore
- Department of Physics
- National University of Singapore
| | - Wen Ping Hu
- School of Science
- Tianjin University
- Tian Jin
- China
| | - Kai Wu
- Singapore-Peking University Research Center for a Sustainable Low-Carbon Future
- Singapore
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871
| | - Guo Qin Xu
- Department of Chemistry
- National University of Singapore
- Singapore
- Singapore-Peking University Research Center for a Sustainable Low-Carbon Future
- Singapore
| | | | - Wei Chen
- Department of Chemistry
- National University of Singapore
- Singapore
- Department of Physics
- National University of Singapore
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15
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Shao Y, Gan Z, Epifanovsky E, Gilbert AT, Wormit M, Kussmann J, Lange AW, Behn A, Deng J, Feng X, Ghosh D, Goldey M, Horn PR, Jacobson LD, Kaliman I, Khaliullin RZ, Kuś T, Landau A, Liu J, Proynov EI, Rhee YM, Richard RM, Rohrdanz MA, Steele RP, Sundstrom EJ, Woodcock HL, Zimmerman PM, Zuev D, Albrecht B, Alguire E, Austin B, Beran GJO, Bernard YA, Berquist E, Brandhorst K, Bravaya KB, Brown ST, Casanova D, Chang CM, Chen Y, Chien SH, Closser KD, Crittenden DL, Diedenhofen M, DiStasio RA, Do H, Dutoi AD, Edgar RG, Fatehi S, Fusti-Molnar L, Ghysels A, Golubeva-Zadorozhnaya A, Gomes J, Hanson-Heine MW, Harbach PH, Hauser AW, Hohenstein EG, Holden ZC, Jagau TC, Ji H, Kaduk B, Khistyaev K, Kim J, Kim J, King RA, Klunzinger P, Kosenkov D, Kowalczyk T, Krauter CM, Lao KU, Laurent AD, Lawler KV, Levchenko SV, Lin CY, Liu F, Livshits E, Lochan RC, Luenser A, Manohar P, Manzer SF, Mao SP, Mardirossian N, Marenich AV, Maurer SA, Mayhall NJ, Neuscamman E, Oana CM, Olivares-Amaya R, O’Neill DP, Parkhill JA, Perrine TM, Peverati R, Prociuk A, Rehn DR, Rosta E, Russ NJ, Sharada SM, Sharma S, Small DW, Sodt A, Stein T, Stück D, Su YC, Thom AJ, Tsuchimochi T, Vanovschi V, Vogt L, Vydrov O, Wang T, Watson MA, Wenzel J, White A, Williams CF, Yang J, Yeganeh S, Yost SR, You ZQ, Zhang IY, Zhang X, Zhao Y, Brooks BR, Chan GK, Chipman DM, Cramer CJ, Goddard WA, Gordon MS, Hehre WJ, Klamt A, Schaefer HF, Schmidt MW, Sherrill CD, Truhlar DG, Warshel A, Xu X, Aspuru-Guzik A, Baer R, Bell AT, Besley NA, Chai JD, Dreuw A, Dunietz BD, Furlani TR, Gwaltney SR, Hsu CP, Jung Y, Kong J, Lambrecht DS, Liang W, Ochsenfeld C, Rassolov VA, Slipchenko LV, Subotnik JE, Van Voorhis T, Herbert JM, Krylov AI, Gill PM, Head-Gordon M. Advances in molecular quantum chemistry contained in the Q-Chem 4 program package. Mol Phys 2014. [DOI: 10.1080/00268976.2014.952696] [Citation(s) in RCA: 1769] [Impact Index Per Article: 176.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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16
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17
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Jackson NE, Heitzer HM, Savoie BM, Reuter MG, Marks TJ, Ratner MA. Emergent Properties in Locally Ordered Molecular Materials. Isr J Chem 2014. [DOI: 10.1002/ijch.201400021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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18
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Ganji MD, Sohbatzadeh Z, Khosravi A. Spin-dependent transport characteristics of Fe met-cars. Struct Chem 2013. [DOI: 10.1007/s11224-013-0328-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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19
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Guo YD, Yan XH, Xiao Y. Conformational change-induced switching behavior in pure-carbon systems. RSC Adv 2013. [DOI: 10.1039/c3ra41401a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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20
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Abstract
The transfer of electrons in molecules and solids is an essential process both in biological systems and in electronic devices. Devices that take advantage of the unique electronic properties of a single molecule have attracted much attention, and applications of these devices include molecular wire, molecular memory, and molecular diodes. The so-called Landauer formula with Green's function techniques provides a basis for theoretical calculations of coherent electron transport in metal-molecule-metal junctions. We have developed a chemical way of thinking about electron transport in molecules in terms of frontier orbital theory. The phase and amplitude of the HOMO and LUMO of π-conjugated molecules determine the essential properties of their electron transport. By considering a close relationship between Green's function and the molecular orbital, we derived an orbital rule that would help our chemical understanding of the phenomenon. First, the sign of the product of the orbital coefficients at sites r and s in the HOMO should be different from the sign of the product of the orbital coefficients at sites r and s in the LUMO. Second, sites r and s in which the amplitude of the HOMO and LUMO is large should be connected. The derived rule allows us to predict essential electron transport properties, which significantly depend on the route of connection between a molecule and electrodes. Qualitative analyses of the site-dependent electron transport in naphthalene (as shown in the graphics) demonstrate that connections 1-4, 1-5, 2-3, and 2-6 are symmetry-allowed for electron transmission, while connections 1-8 and 2-7 are symmetry-forbidden. On the basis of orbital interaction analysis, we have extended this rule to metal-molecule-metal junctions of dithiol derivatives in which two gold electrodes have direct contacts with a molecule through two Au-S bonds. Recently we confirmed these theoretical predictions experimentally by using nanofabricated mechanically controllable break junctions to measure the single-molecule conductance of naphthalene dithiol derivatives. The measurement of the symmetry-allowed 1,4-naphthalene dithiol shows a single-molecule conductance that exceeds that of the symmetry-forbidden 2,7-naphthalene dithiol by 2 orders of magnitude. Because the HOMO and LUMO levels and the HOMO-LUMO gaps are similar in the derivatives, the difference in the measured molecular conductances arises from the difference in the phase relationship of the frontier orbitals. Thus, the phase, amplitude, and spatial distribution of the frontier orbitals provide a way to rationally control electron transport properties within and between molecules.
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Affiliation(s)
- Kazunari Yoshizawa
- Institute for Materials Chemistry and Engineering and International Research Center for Molecular Systems, Kyushu University, Fukuoka 819-0395, Japan
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22
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Aoki M, Kamada T, Sasaki K, Masuda S, Morikawa Y. Chemisorption-induced gap states at organic–metal interfaces: benzenethiol and benzeneselenol on metal surfaces. Phys Chem Chem Phys 2012; 14:4101-8. [DOI: 10.1039/c2cp23206e] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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23
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SEIDEMAN TAMAR, GUO HONG. QUANTUM TRANSPORT AND CURRENT-TRIGGERED DYNAMICS IN MOLECULAR TUNNEL JUNCTIONS. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2011. [DOI: 10.1142/s0219633603000616] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The modelling of nanoelectronic systems has been the topic of ever increasing activity for nearly two decades. Yet, new questions, challenges and opportunities continue to emerge. In this article we review theoretical and numerical work on two new developments in the theory of molecular-scale electronics. First we review a density functional theory analysis within the Keldysh non-equilibrium Green function formalism to predict nonlinear charge transport properties of nanoelectronic devices. Next we review a recently developed quantum mechanical formalism of current-triggered nuclear dynamics. Finally we combine these theories to describe from first principles the inelastic current and the consequent molecular dynamics in molecular heterojunctions.
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Affiliation(s)
- TAMAR SEIDEMAN
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL. 60208-3113, USA
| | - HONG GUO
- Center for the Physics of Materials & Department of Physics, McGill University, Montreal, PQ, Canada H3A 2T8, Canada
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24
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Renaud N, Hliwa M, Joachim C. Single molecule logical devices. Top Curr Chem (Cham) 2011; 313:217-68. [PMID: 21826604 DOI: 10.1007/128_2011_222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
After almost 40 years of development, molecular electronics has given birth to many exciting ideas that range from molecular wires to molecular qubit-based quantum computers. This chapter reviews our efforts to answer a simple question: how smart can a single molecule be? In our case a molecule able to perform a simple Boolean function is a child prodigy. Following the Aviram and Ratner approach, these molecules are inserted between several conducting electrodes. The electronic conduction of the resulting molecular junction is extremely sensitive to the chemical nature of the molecule. Therefore designing this latter correctly allows the implementation of a given function inside the molecular junction. Throughout the chapter different approaches are reviewed, from hybrid devices to quantum molecular logic gates. We particularly stress that one can implement an entire logic circuit in a single molecule, using either classical-like intramolecular connections, or a deformation of the molecular orbitals induced by a conformational change of the molecule. These approaches are radically different from the hybrid-device approach, where several molecules are connected together to build the circuit.
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Affiliation(s)
- Nicolas Renaud
- Department of Chemistry, Northwestern University, Evanston, IL 60208-3113, USA.
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25
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Negre CFA, Jara GE, Vera DMA, Pierini AB, Sánchez CG. Detailed analysis of water structure in a solvent mediated electron tunneling mechanism. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2011; 23:245305. [PMID: 21628786 DOI: 10.1088/0953-8984/23/24/245305] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
This work aims at describing the water structure characteristics that influence the electron transfer superexchange mechanism by explicitly calculating the solvent mediated conductance between the donor and acceptor in a generic pair. The method employed here is based on the non-equilibrium Green function formalism for calculating the conductance over solvent trajectories previously determined by molecular dynamics methods. A non-exponential dependence of the conductance is observed with respect to the distance between the donor and the acceptor. Local fluctuations of the solvent structure are responsible for the non-monotonic dependence, mainly due to the formation of solvent bridges that act as a molecular wire connecting the sites. This shortcutting phenomenon is observed for certain ranges of distances between the donor and acceptor in the pair. Charge on the sites strongly affects the local solvent structure and causes qualitative changes in the distance dependence of the tunneling probability.
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Affiliation(s)
- Christian F A Negre
- Departamento de Matemática y Física, Facultad de Ciencias Químicas, INFIQC, Universidad Nacional de Córdoba, Ciudad Universitaria, Córdoba, Argentina
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26
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Renaud N, Ratner MA, Joachim C. A Time-Dependent Approach to Electronic Transmission in Model Molecular Junctions. J Phys Chem B 2011; 115:5582-92. [DOI: 10.1021/jp111384d] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- N. Renaud
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - M. A. Ratner
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - C. Joachim
- Nanoscience Group & MANA Sattelite CEMES/CNRS, 29 rue J. Marvig, BP 4347, 31055 Toulouse Cedex, France
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27
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Wang G, Kim TW, Lee T. Electrical transport characteristics through molecular layers. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm12702k] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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28
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Ding B, Washington V, Dunietz BD. On the conditions for enhanced transport through molecular junctions based on metal centres ligated by pairs of pyridazino-derived ligands. Mol Phys 2010. [DOI: 10.1080/00268976.2010.514303] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Bei Ding
- a Department of Chemistry , The University of Michigan , Ann Arbor , Michigan, 48109 , USA
| | - Victoria Washington
- a Department of Chemistry , The University of Michigan , Ann Arbor , Michigan, 48109 , USA
| | - Barry D. Dunietz
- a Department of Chemistry , The University of Michigan , Ann Arbor , Michigan, 48109 , USA
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Liu H, Yu C, Gao N, Zhao J. The diversity of electron-transport behaviors of molecular junctions: correlation with the electron-transport pathway. Chemphyschem 2010; 11:1895-902. [PMID: 20379983 DOI: 10.1002/cphc.201000092] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
We report the electron-transport behaviors of a number of molecular junctions composed of pi-conjugated molecular wires. From calculations performed by using density functional theory (DFT) combined with the non-equilibrium Green's function (NEGF) method, we found that the length-conductivity relations are diverse, depending on the particular molecular structures. The results reveal that the conductance-length dependence follows an exponential law for many conjugated molecules with a single channel, such as oligothiophene, oligopyrrole and oligophenylene. Therefore, a quantitative relation between the energy gap (E(g))(infinity) of the molecular wire and the attenuation factor beta can be defined. However, when the molecular wires have multichannels, the decay of conductance does not follow the exponential relation. For example, the conductance of porphyrin-based oligomers and fused thiophene decays almost linearly. The diversity of electron-transport behaviors of molecular junctions is directly dominated by the electron-transport pathway.
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Affiliation(s)
- Hongmei Liu
- Key laboratory of Analytical Chemistry for Life Science (Ministry of Education), School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210008, PR China
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30
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Perrine TM, Dunietz BD. Contact Geometry Symmetry Dependence of Field Effect Gating in Single-Molecule Transistors. J Am Chem Soc 2010; 132:2914-8. [DOI: 10.1021/ja906234v] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Trilisa M. Perrine
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109
| | - Barry D. Dunietz
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109
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31
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Masuda S, Kamada T, Sasaki K, Aokia M, Morikawa Y. Chemisorption-induced gap state at organic–metal interface: Benzenethiol on Pt(111). Phys Chem Chem Phys 2010; 12:10914-8. [DOI: 10.1039/c001016b] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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32
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Scott AM, Miura T, Ricks AB, Dance ZEX, Giacobbe EM, Colvin MT, Wasielewski MR. Spin-Selective Charge Transport Pathways through p-Oligophenylene-Linked Donor−Bridge−Acceptor Molecules. J Am Chem Soc 2009; 131:17655-66. [DOI: 10.1021/ja907625k] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Amy M. Scott
- Department of Chemistry and Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113
| | - Tomoaki Miura
- Department of Chemistry and Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113
| | - Annie Butler Ricks
- Department of Chemistry and Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113
| | - Zachary E. X. Dance
- Department of Chemistry and Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113
| | - Emilie M. Giacobbe
- Department of Chemistry and Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113
| | - Michael T. Colvin
- Department of Chemistry and Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113
| | - Michael R. Wasielewski
- Department of Chemistry and Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113
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33
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Huisman EH, Guédon CM, van Wees BJ, van der Molen SJ. Interpretation of transition voltage spectroscopy. NANO LETTERS 2009; 9:3909-13. [PMID: 19685928 DOI: 10.1021/nl9021094] [Citation(s) in RCA: 123] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
The promise of transition voltage spectroscopy (TVS) is that molecular level positions can be determined in molecular devices without applying extreme voltages. Here, we consider the physics behind TVS in more detail. Remarkably, we find that the Simmons model employed thus far is inconsistent with experimental data. However, a coherent molecular transport model does justify TVS as a spectroscopic tool. Moreover, TVS may become a critical test to distinguish molecular junctions from vacuum tunnel junctions.
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Affiliation(s)
- Everardus H Huisman
- Physics of Nanodevices, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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34
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George CB, Ratner MA, Lambert JB. Strong Conductance Variation in Conformationally Constrained Oligosilane Tunnel Junctions. J Phys Chem A 2009; 113:3876-80. [DOI: 10.1021/jp809963r] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - Mark A. Ratner
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208
| | - Joseph B. Lambert
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208
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35
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Kondo H, Nara J, Kino H, Ohno T. Transport properties of a biphenyl-based molecular junction system-the electrode metal dependence. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2009; 21:064220. [PMID: 21715922 DOI: 10.1088/0953-8984/21/6/064220] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We investigate the transport properties of a biphenyl-dithiol molecule sandwiched between electrodes made of metal Y (Y = Cu, Ag and Au) using the non-equilibrium Green's function method based on a density functional theory. The electrode metal Y has an influence on the coupling between the molecule and electrodes, and thus on the transmission peak height. For the transmission T(Y) at the Fermi energy, we obtain T(Cu)∼T(Ag)<T(Au). As a result, the current value at low bias voltage for the junction system with Ag or Cu electrodes is smaller than that for Y = Au. At high bias voltage, on the other hand, the current value of an Ag electrode system becomes larger than the others due to the higher transmission peak around -1.5 eV below the Fermi energy. Besides this, it is shown that the transmission peak value for all the electrode metals can be expressed generally as a function of a ratio of the coupling between the two phenyl rings to the peak width of the projected density of states with respect to a corresponding molecular orbital.
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Affiliation(s)
- Hisashi Kondo
- CMSC, National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0047, Japan. Institute of Industrial Science, University of Tokyo, Meguro, Tokyo 153-8505, Japan
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36
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Pan Z, Li QX, Shi QW, Wang XP. First-principles Study of Electron Transport Through Oligoacenes. CHINESE J CHEM PHYS 2009. [DOI: 10.1088/1674-0068/22/01/7-12] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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37
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Hansen T, Solomon GC, Andrews DQ, Ratner MA. Interfering pathways in benzene: An analytical treatment. J Chem Phys 2009; 131:194704. [DOI: 10.1063/1.3259548] [Citation(s) in RCA: 114] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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38
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Liu H, Li P, Zhao J, Yin X, Zhang H. Theoretical investigation on molecular rectification on the basis of asymmetric substitution and proton transfer reaction. J Chem Phys 2008; 129:224704. [DOI: 10.1063/1.3030949] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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39
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Perrine TM, Berto T, Dunietz BD. Enhanced Conductance via Induced Π-Stacking Interactions in Cobalt(II) Terpyridine Bridged Complexes. J Phys Chem B 2008; 112:16070-5. [DOI: 10.1021/jp8075854] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Timothy Berto
- The University of Michigan, Ann Arbor, Michigan 48109
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40
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Jiang J, Kula M, Luo Y. Molecular modeling of inelastic electron transport in molecular junctions. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2008; 20:374110. [PMID: 21694417 DOI: 10.1088/0953-8984/20/37/374110] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A quantum chemical approach for the modeling of inelastic electron tunneling spectroscopy of molecular junctions based on scattering theory is presented. Within a harmonic approximation, the proposed method allows us to calculate the electron-vibration coupling strength analytically, which makes it applicable to many different systems. The calculated inelastic electron transport spectra are often in very good agreement with their experimental counterparts, allowing the revelation of detailed information about molecular conformations inside the junction, molecule-metal contact structures, and intermolecular interaction that is largely inaccessible experimentally.
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Affiliation(s)
- Jun Jiang
- Department of Theoretical Chemistry, School of Biotechnology, Royal Institute of Technology, S-106 91 Stockholm, Sweden
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41
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Liu H, Wang N, Zhao J, Guo Y, Yin X, Boey FYC, Zhang H. Length-dependent conductance of molecular wires and contact resistance in metal-molecule-metal junctions. Chemphyschem 2008; 9:1416-24. [PMID: 18512822 DOI: 10.1002/cphc.200800032] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Molecular wires are covalently bonded to gold electrodes--to form metal-molecule-metal junctions--by functionalizing each end with a -SH group. The conductance of a wide variety of molecular junctions is studied theoretically by using first-principles density functional theory (DFT) combined with the nonequilibrium Green's function (NEGF) formalism. Based on the chain-length-dependent conductance of the series of molecular wires, the attenuation factor beta is obtained and compared with the experimental data. The beta value is quantitatively correlated to the molecular HOMO-LUMO gap. Coupling between the metallic electrode and the molecular bridge plays an important role in electron transport. A contact resistance of 6.0+/-2.0 Kohms is obtained by extrapolating the molecular-bridge length to zero. This value is of the same magnitude as the quantum resistance.
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Affiliation(s)
- Hongmei Liu
- Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210008, PR China
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42
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Morita T, Lindsay S. Reduction-Induced Switching of Single-Molecule Conductance of Fullerene Derivatives. J Phys Chem B 2008; 112:10563-72. [DOI: 10.1021/jp8021387] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tomoyuki Morita
- Biodesign Institute, Department of Chemistry and Biochemistry, and Department of Physics, Arizona State University, Tempe, Arizona 85287, and Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto-Daigaku-Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Stuart Lindsay
- Biodesign Institute, Department of Chemistry and Biochemistry, and Department of Physics, Arizona State University, Tempe, Arizona 85287, and Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto-Daigaku-Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
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43
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Farmanzadeh D, Sabzyan H. Characterization of a candidate multi-pole molecular switch using computational techniques. J Mol Model 2008; 14:1023-33. [DOI: 10.1007/s00894-008-0345-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2007] [Accepted: 06/23/2008] [Indexed: 10/21/2022]
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44
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Ulgut B, Abruña HD. Electron Transfer through Molecules and Assemblies at Electrode Surfaces. Chem Rev 2008; 108:2721-36. [DOI: 10.1021/cr068060w] [Citation(s) in RCA: 109] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Burak Ulgut
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301
| | - Héctor D. Abruña
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301
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45
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Yoshizawa K, Tada T, Staykov A. Orbital Views of the Electron Transport in Molecular Devices. J Am Chem Soc 2008; 130:9406-13. [DOI: 10.1021/ja800638t] [Citation(s) in RCA: 196] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kazunari Yoshizawa
- Institute for Materials Chemistry and Engineering, Kyushu University, Nishi-ku, Fukuoka 819-0395, Japan, and Department of Materials Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Tomofumi Tada
- Institute for Materials Chemistry and Engineering, Kyushu University, Nishi-ku, Fukuoka 819-0395, Japan, and Department of Materials Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Aleksandar Staykov
- Institute for Materials Chemistry and Engineering, Kyushu University, Nishi-ku, Fukuoka 819-0395, Japan, and Department of Materials Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
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46
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Beste A, Meunier V, Harrison RJ. Electron transport in open systems from finite-size calculations: Examination of the principal layer method applied to linear gold chains. J Chem Phys 2008; 128:154713. [PMID: 18433264 DOI: 10.1063/1.2905219] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We describe the occurrence of computational artifacts when the principal layer method is used in combination with the cluster approximation for the calculation of electronic transport properties of nanostructures. For a one-dimensional gold chain, we observe an unphysical band in the band structure. The artificial band persists for large principal layers and for large buffer sizes. We demonstrate that the assumption of equality between Hamiltonian elements of neighboring layers is no longer valid and that a discontinuity is introduced in the potential at the layer transition. The effect depends on the basis set. When periodic boundary conditions are imposed and the k-space sampling is converged, the discontinuity disappears and the principal layer method can be correctly applied by using a linear combination of atomic orbitals as basis set.
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Affiliation(s)
- Ariana Beste
- Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6367, USA.
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47
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Kondo H, Nara J, Kino H, Ohno T. Dependence of the conduction of a single biphenyl dithiol molecule on the dihedral angle between the phenyl rings and its application to a nanorectifier. J Chem Phys 2008; 128:064701. [DOI: 10.1063/1.2828531] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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48
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Scendo M, Hepel M. Inhibiting properties of benzimidazole films for Cu(II)/Cu(I) reduction in chloride media studied by RDE and EQCN techniques. J Electroanal Chem (Lausanne) 2008. [DOI: 10.1016/j.jelechem.2007.10.014] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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49
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Abstract
Quantum transport properties through some multilevel quantum dots sandwiched between two metallic contacts are investigated by the use of Green's function technique. Here, we do parametric calculations, based on the tight-binding model, to study the transport properties through such bridge systems. The electron transport properties are significantly influenced by (a) the number of quantized energy levels in the dots, (b) the dot-to-electrodes coupling strength, (c) the location of the equilibrium Fermi energy E F , and (d) the surface disorder. In the limit of weak-coupling, the conductance (g) shows sharp resonance peaks associated with the quantized energy levels in the dots, while, they get substantial broadening in the strong-coupling limit. The behavior of the electron transfer through these systems becomes much more clearly visible from our study of the current–voltage (I–V) characteristics. In this context, we also describe the noise power of current fluctuations (S) and determine the Fano factor (F) which provides an important information about the electron correlation among the charge carriers. Finally, we explore a novel transport phenomenon by studying the surface disorder effect in which the current amplitude increases with the increase of the surface disorder strength in the strong disorder regime, while, the amplitude decreases in the limit of weak disorder. Such an anomalous behavior is completely opposite to that of bulk disordered system where the current amplitude always decreases with the disorder strength. It is also observed that the current amplitude strongly depends on the system size which reveals the finite quantum size effect.
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Affiliation(s)
- SANTANU K. MAITI
- Theoretical Condensed Matter Physics Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700 064, India
- Department of Physics, Narasinha Dutt College, 129, Belilious Road, Howrah 711 101, India
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50
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Zhou YX, Jiang F, Chen H, Note R, Mizuseki H, Kawazoe Y. First-principles study of length dependence of conductance in alkanedithiols. J Chem Phys 2008; 128:044704. [DOI: 10.1063/1.2827868] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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