1
|
Rodgers LVH, Nguyen ST, Cox JH, Zervas K, Yuan Z, Sangtawesin S, Stacey A, Jaye C, Weiland C, Pershin A, Gali A, Thomsen L, Meynell SA, Hughes LB, Jayich ACB, Gui X, Cava RJ, Knowles RR, de Leon NP. Diamond surface functionalization via visible light-driven C-H activation for nanoscale quantum sensing. Proc Natl Acad Sci U S A 2024; 121:e2316032121. [PMID: 38451945 PMCID: PMC10945787 DOI: 10.1073/pnas.2316032121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Accepted: 01/08/2024] [Indexed: 03/09/2024] Open
Abstract
Nitrogen-vacancy (NV) centers in diamond are a promising platform for nanoscale NMR sensing. Despite significant progress toward using NV centers to detect and localize nuclear spins down to the single spin level, NV-based spectroscopy of individual, intact, arbitrary target molecules remains elusive. Such sensing requires that target molecules are immobilized within nanometers of NV centers with long spin coherence. The inert nature of diamond typically requires harsh functionalization techniques such as thermal annealing or plasma processing, limiting the scope of functional groups that can be attached to the surface. Solution-phase chemical methods can be readily generalized to install diverse functional groups, but they have not been widely explored for single-crystal diamond surfaces. Moreover, realizing shallow NV centers with long spin coherence times requires highly ordered single-crystal surfaces, and solution-phase functionalization has not yet been shown with such demanding conditions. In this work, we report a versatile strategy to directly functionalize C-H bonds on single-crystal diamond surfaces under ambient conditions using visible light, forming C-F, C-Cl, C-S, and C-N bonds at the surface. This method is compatible with NV centers within 10 nm of the surface with spin coherence times comparable to the state of the art. As a proof-of-principle demonstration, we use shallow ensembles of NV centers to detect nuclear spins from surface-bound functional groups. Our approach to surface functionalization opens the door to deploying NV centers as a tool for chemical sensing and single-molecule spectroscopy.
Collapse
Affiliation(s)
- Lila V. H. Rodgers
- Department of Electrical and Computer Engineering, Princeton University, Princeton, NJ08540
| | - Suong T. Nguyen
- Department of Chemistry, Princeton University, Princeton, NJ08540
| | - James H. Cox
- Department of Chemistry, Princeton University, Princeton, NJ08540
| | - Kalliope Zervas
- Department of Electrical and Computer Engineering, Princeton University, Princeton, NJ08540
| | - Zhiyang Yuan
- Department of Electrical and Computer Engineering, Princeton University, Princeton, NJ08540
| | - Sorawis Sangtawesin
- School of Physics, Suranaree University of Technology, Nakhon Ratchasima30000, Thailand
- Center of Excellence in Advanced Functional Materials, Suranaree University of Technology, Nakhon Ratchasima30000, Thailand
| | - Alastair Stacey
- School of Physics, University of Melbourne, Parkville, VIC3010, Australia
- School of Science, RMIT University, Melbourne, VIC3000, Australia
| | - Cherno Jaye
- Materials Measurement Science Division, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD20899
| | - Conan Weiland
- Materials Measurement Science Division, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD20899
| | - Anton Pershin
- HUN-REN Wigner Research Centre for Physics, Institute for Solid State Physics and Optics, BudapestH-1525, Hungary
- MTA-WFK Lendület “Momentum” Semiconductor Nanostructures Research Group, BudapestH-1525, Hungary
| | - Adam Gali
- HUN-REN Wigner Research Centre for Physics, Institute for Solid State Physics and Optics, BudapestH-1525, Hungary
- MTA-WFK Lendület “Momentum” Semiconductor Nanostructures Research Group, BudapestH-1525, Hungary
- Department of Atomic Physics, Institute of Physics, Budapest University of Technology and Economics, BudapestH-1111, Hungary
| | - Lars Thomsen
- Australian Synchrotron, Australian Nuclear Science and Technology Organisation, Clayton, VIC3168, Australia
| | - Simon A. Meynell
- Physics Department, University of California, Santa Barbara, CA93106
| | - Lillian B. Hughes
- Materials Department, University of California, Santa Barbara, CA93106
| | | | - Xin Gui
- Department of Chemistry, Princeton University, Princeton, NJ08540
| | - Robert J. Cava
- Department of Chemistry, Princeton University, Princeton, NJ08540
| | | | - Nathalie P. de Leon
- Department of Electrical and Computer Engineering, Princeton University, Princeton, NJ08540
| |
Collapse
|
2
|
Freire-Moschovitis FA, Rizzato R, Pershin A, Schepp MR, Allert RD, Todenhagen LM, Brandt MS, Gali A, Bucher DB. The Role of Electrolytes in the Relaxation of Near-Surface Spin Defects in Diamond. ACS Nano 2023. [PMID: 37212793 DOI: 10.1021/acsnano.3c01298] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Quantum sensing with spin defects in diamond, such as the nitrogen vacancy (NV) center, enables the detection of various chemical species on the nanoscale. Molecules or ions with unpaired electronic spins are typically probed by their influence on the NV center's spin relaxation. Whereas it is well-known that paramagnetic ions reduce the NV center's relaxation time (T1), here we report on the opposite effect for diamagnetic ions. We demonstrate that millimolar concentrations of aqueous diamagnetic electrolyte solutions increase the T1 time of near-surface NV center ensembles compared to pure water. To elucidate the underlying mechanism of this surprising effect, single and double quantum NV experiments are performed, which indicate a reduction of magnetic and electric noise in the presence of diamagnetic electrolytes. In combination with ab initio simulations, we propose that a change in the interfacial band bending due to the formation of an electric double layer leads to a stabilization of fluctuating charges at the interface of an oxidized diamond. This work not only helps to understand noise sources in quantum systems but could also broaden the application space of quantum sensors toward electrolyte sensing in cell biology, neuroscience, and electrochemistry.
Collapse
Affiliation(s)
- Fabian A Freire-Moschovitis
- Technical University of Munich, TUM School of Natural Sciences, Department of Chemistry, Lichtenbergstraße 4, 85748 Garching, Germany
- Munich Center for Quantum Science and Technology (MCQST), Schellingstraße 4, 80799 München, Germany
| | - Roberto Rizzato
- Technical University of Munich, TUM School of Natural Sciences, Department of Chemistry, Lichtenbergstraße 4, 85748 Garching, Germany
- Munich Center for Quantum Science and Technology (MCQST), Schellingstraße 4, 80799 München, Germany
| | - Anton Pershin
- Wigner Research Centre for Physics, Institute for Solid State Physics and Optics, P.O. Box 49, Budapest H-1525, Hungary
| | - Moritz R Schepp
- Technical University of Munich, TUM School of Natural Sciences, Department of Chemistry, Lichtenbergstraße 4, 85748 Garching, Germany
| | - Robin D Allert
- Technical University of Munich, TUM School of Natural Sciences, Department of Chemistry, Lichtenbergstraße 4, 85748 Garching, Germany
- Munich Center for Quantum Science and Technology (MCQST), Schellingstraße 4, 80799 München, Germany
| | - Lina M Todenhagen
- Munich Center for Quantum Science and Technology (MCQST), Schellingstraße 4, 80799 München, Germany
- Technical University of Munich, Walter Schottky Institut, Am Coulombwall 4, 85748 Garching, Germany
- Technical University of Munich, TUM School of Natural Sciences, Department of Physics, James-Franck-Straße 1, 85748 Garching, Germany
| | - Martin S Brandt
- Munich Center for Quantum Science and Technology (MCQST), Schellingstraße 4, 80799 München, Germany
- Technical University of Munich, Walter Schottky Institut, Am Coulombwall 4, 85748 Garching, Germany
- Technical University of Munich, TUM School of Natural Sciences, Department of Physics, James-Franck-Straße 1, 85748 Garching, Germany
| | - Adam Gali
- Wigner Research Centre for Physics, Institute for Solid State Physics and Optics, P.O. Box 49, Budapest H-1525, Hungary
- Department of Atomic Physics, Institute of Physics, Budapest University of Technology and Economics, Műegyetem rakpart 3, Budapest H-1111, Hungary
| | - Dominik B Bucher
- Technical University of Munich, TUM School of Natural Sciences, Department of Chemistry, Lichtenbergstraße 4, 85748 Garching, Germany
- Munich Center for Quantum Science and Technology (MCQST), Schellingstraße 4, 80799 München, Germany
| |
Collapse
|
3
|
Hall D, Sancho-García JC, Pershin A, Beljonne D, Zysman-Colman E, Olivier Y. Benchmarking DFT Functionals for Excited-State Calculations of Donor-Acceptor TADF Emitters: Insights on the Key Parameters Determining Reverse Inter-System Crossing. J Phys Chem A 2023. [PMID: 37196185 DOI: 10.1021/acs.jpca.2c08201] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
The importance of intermediate triplet states and the nature of excited states has gained interest in recent years for the thermally activated delayed fluorescence (TADF) mechanism. It is widely accepted that simple conversion between charge transfer (CT) triplet and singlet excited states is too crude, and a more complex route involving higher-lying locally excited triplet excited states has to be invoked to witness the magnitude of the rate of reverse inter-system crossing (RISC) rates. The increased complexity has challenged the reliability of computational methods to accurately predict the relative energy between excited states as well as their nature. Here, we compare the results of widely used density functional theory (DFT) functionals, CAM-B3LYP, LC-ωPBE, LC-ω*PBE, LC-ω*HPBE, B3LYP, PBE0, and M06-2X, against a wavefunction-based reference method, Spin-Component Scaling second-order approximate Coupled Cluster (SCS-CC2), in 14 known TADF emitters possessing a diversity of chemical structures. Overall, the use of the Tamm-Dancoff Approximation (TDA) together with CAM-B3LYP, M06-2X, and the two ω-tuned range-separated functionals LC-ω*PBE and LC-ω*HPBE demonstrated the best agreement with SCS-CC2 calculations in predicting the absolute energy of the singlet S1, and triplet T1 and T2 excited states and their energy differences. However, consistently across the series and irrespective of the functional or the use of TDA, the nature of T1 and T2 is not as accurately captured as compared to S1. We also investigated the impact of the optimization of S1 and T1 excited states on ΔEST and the nature of these states for three different functionals (PBE0, CAM-B3LYP, and M06-2X). We observed large changes in ΔEST using CAM-B3LYP and PBE0 functionals associated with a large stabilization of T1 with CAM-B3LYP and a large stabilization of S1 with PBE0, while ΔEST is much less affected considering the M06-2X functional. The nature of the S1 state barely evolves after geometry optimization essentially because this state is CT by nature for the three functionals tested. However, the prediction of the T1 nature is more problematic since these functionals for some compounds interpret the nature of T1 very differently. SCS-CC2 calculations on top of the TDA-DFT optimized geometries lead to a large variation in terms of ΔEST and the excited-state nature depending on the chosen functionals, further stressing the large dependence of the excited-state features on the excited-state geometries. The presented work highlights that despite good agreement of energies, the description of the exact nature of the triplet states should be undertaken with caution.
Collapse
Affiliation(s)
- David Hall
- Organic Semiconductor Centre, EaStCHEM School of Chemistry, University of St Andrews, KY16 9ST St Andrews, U.K
- Laboratory for Chemistry of Novel Materials, University of Mons, 7000 Mons, Belgium
| | | | - Anton Pershin
- Wigner Research Centre for Physics, P.O. Box 49, 1121 Budapest, Hungary
| | - David Beljonne
- Laboratory for Chemistry of Novel Materials, University of Mons, 7000 Mons, Belgium
| | - Eli Zysman-Colman
- Organic Semiconductor Centre, EaStCHEM School of Chemistry, University of St Andrews, KY16 9ST St Andrews, U.K
| | - Yoann Olivier
- Laboratory for Computational Modeling of Functional Materials, Namur Institute of Structured Matter, University of Namur, Rue de Bruxelles, 61, 5000 Namur, Belgium
| |
Collapse
|
4
|
Neethirajan J, Hache T, Paone D, Pinto D, Denisenko A, Stöhr R, Udvarhelyi P, Pershin A, Gali A, Wrachtrup J, Kern K, Singha A. Controlled Surface Modification to Revive Shallow NV - Centers. Nano Lett 2023; 23:2563-2569. [PMID: 36927005 PMCID: PMC10103335 DOI: 10.1021/acs.nanolett.2c04733] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Revised: 03/14/2023] [Indexed: 06/18/2023]
Abstract
Near-surface negatively charged nitrogen vacancy (NV) centers hold excellent promise for nanoscale magnetic imaging and quantum sensing. However, they often experience charge-state instabilities, leading to strongly reduced fluorescence and NV coherence time, which negatively impact magnetic imaging sensitivity. This occurs even more severely at 4 K and ultrahigh vacuum (UHV, p = 2 × 10-10 mbar). We demonstrate that in situ adsorption of H2O on the diamond surface allows the partial recovery of the shallow NV sensors. Combining these with band-bending calculations, we conclude that controlled surface treatments are essential for implementing NV-based quantum sensing protocols under cryogenic UHV conditions.
Collapse
Affiliation(s)
| | - Toni Hache
- Max
Planck Institute for Solid State Research, 70569 Stuttgart, Germany
| | - Domenico Paone
- Max
Planck Institute for Solid State Research, 70569 Stuttgart, Germany
- 3rd
Institute of Physics and Research Center SCoPE, University of Stuttgart, 70049 Stuttgart, Germany
| | - Dinesh Pinto
- Max
Planck Institute for Solid State Research, 70569 Stuttgart, Germany
- Institute
de Physique, École Polytechnique
Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Andrej Denisenko
- 3rd
Institute of Physics and Research Center SCoPE, University of Stuttgart, 70049 Stuttgart, Germany
| | - Rainer Stöhr
- 3rd
Institute of Physics and Research Center SCoPE, University of Stuttgart, 70049 Stuttgart, Germany
| | - Péter Udvarhelyi
- Wigner
Research Centre for Physics, Institute for Solid State Physics and Optics, Budapest, POB 49, H-1525, Hungary
- Department
of Atomic Physics, Institute of Physics, Budapest University of Technology and Economics, Műegyetem rakpart 3, H-1111 Budapest, Hungary
| | - Anton Pershin
- Wigner
Research Centre for Physics, Institute for Solid State Physics and Optics, Budapest, POB 49, H-1525, Hungary
- Department
of Atomic Physics, Institute of Physics, Budapest University of Technology and Economics, Műegyetem rakpart 3, H-1111 Budapest, Hungary
| | - Adam Gali
- Wigner
Research Centre for Physics, Institute for Solid State Physics and Optics, Budapest, POB 49, H-1525, Hungary
- Department
of Atomic Physics, Institute of Physics, Budapest University of Technology and Economics, Műegyetem rakpart 3, H-1111 Budapest, Hungary
| | - Joerg Wrachtrup
- Max
Planck Institute for Solid State Research, 70569 Stuttgart, Germany
- 3rd
Institute of Physics and Research Center SCoPE, University of Stuttgart, 70049 Stuttgart, Germany
| | - Klaus Kern
- Max
Planck Institute for Solid State Research, 70569 Stuttgart, Germany
- Institute
de Physique, École Polytechnique
Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Aparajita Singha
- Max
Planck Institute for Solid State Research, 70569 Stuttgart, Germany
- Center
for
Integrated Quantum Science and Technology IQST, University of Stuttgart, 70049 Stuttgart, Germany
| |
Collapse
|
5
|
Pershin A, Beaume C, Li K, Tobias SM. Training a neural network to predict dynamics it has never seen. Phys Rev E 2023; 107:014304. [PMID: 36797895 DOI: 10.1103/physreve.107.014304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Accepted: 12/15/2022] [Indexed: 01/24/2023]
Abstract
Neural networks have proven to be remarkably successful for a wide range of complicated tasks, from image recognition and object detection to speech recognition and machine translation. One of their successes lies in their ability to predict future dynamics given a suitable training data set. Previous studies have shown how echo state networks (ESNs), a type of recurrent neural networks, can successfully predict both short-term and long-term dynamics of even chaotic systems. This study shows that, remarkably, ESNs can successfully predict dynamical behavior that is qualitatively different from any behavior contained in their training set. Evidence is provided for a fluid dynamics problem where the flow can transition between laminar (ordered) and turbulent (seemingly disordered) regimes. Despite being trained on the turbulent regime only, ESNs are found to predict the existence of laminar behavior. Moreover, the statistics of turbulent-to-laminar and laminar-to-turbulent transitions are also predicted successfully. The utility of ESNs in acting as early-warning generators for transition is discussed. These results are expected to be widely applicable to data-driven modeling of temporal behavior in a range of physical, climate, biological, ecological, and finance models characterized by the presence of tipping points and sudden transitions between several competing states.
Collapse
Affiliation(s)
- Anton Pershin
- Atmospheric, Oceanic and Planetary Physics, University of Oxford, Oxford, United Kingdom and School of Mathematics, University of Leeds, Leeds, OX1 3PU United Kingdom
| | - Cédric Beaume
- School of Mathematics, University of Leeds, Leeds, LS2 9JT United Kingdom
| | - Kuan Li
- School of Mathematics, University of Leeds, Leeds, LS2 9JT United Kingdom
| | - Steven M Tobias
- School of Mathematics, University of Leeds, Leeds, LS2 9JT United Kingdom
| |
Collapse
|
6
|
Barcza G, Werner MA, Zaránd G, Pershin A, Benedek Z, Legeza Ö, Szilvási T. Toward Large-Scale Restricted Active Space Calculations Inspired by the Schmidt Decomposition. J Phys Chem A 2022; 126:9709-9718. [PMID: 36520596 DOI: 10.1021/acs.jpca.2c05952] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
We present an alternative, memory-efficient, Schmidt decomposition-based description of the inherently bipartite restricted active space (RAS) scheme, which can be implemented effortlessly within the density matrix renormalization group (DMRG) method via the dynamically extended active space procedure. Benchmark calculations are compared against state-of-the-art results of C2 and Cr2, which are notorious for their multireference character. Our results for ground and excited states together with spectroscopic constants demonstrate that the proposed novel approach, dubbed as DMRG-RAS, which is variational and free of uncontrolled method errors, has the potential to outperfom conventional methods for strongly correlated molecules.
Collapse
Affiliation(s)
- Gergely Barcza
- Wigner Research Centre for Physics, H-1525Budapest, Hungary.,Department of Physics of Complex Systems, ELTE Eötvös Loránd University, H-1117, Budapest, Hungary.,Department of Chemical and Biological Engineering, The University of Alabama, Tuscaloosa, Alabama35487, United States
| | - Miklós Antal Werner
- Department of Theoretical Physics, Institute of Physics, Budapest University of Technology and Economics, H-1111Budapest, Hungary.,MTA-BME Quantum Dynamics and Correlations Research Group, H-1111Budapest, Hungary
| | - Gergely Zaránd
- Department of Theoretical Physics, Institute of Physics, Budapest University of Technology and Economics, H-1111Budapest, Hungary.,MTA-BME Quantum Dynamics and Correlations Research Group, H-1111Budapest, Hungary
| | - Anton Pershin
- Wigner Research Centre for Physics, H-1525Budapest, Hungary
| | - Zsolt Benedek
- Wigner Research Centre for Physics, H-1525Budapest, Hungary.,Department of Chemical and Biological Engineering, The University of Alabama, Tuscaloosa, Alabama35487, United States
| | - Örs Legeza
- Wigner Research Centre for Physics, H-1525Budapest, Hungary.,Fachbereich Physik, Philipps-Universität Marburg, 35032Marburg, Germany.,Institute for Advanced Study, Technical University of Munich, Lichtenbergstrasse 2a, 85748Garching, Germany
| | - Tibor Szilvási
- Department of Chemical and Biological Engineering, The University of Alabama, Tuscaloosa, Alabama35487, United States
| |
Collapse
|
7
|
Barcza G, Pershin A, Gali A, Legeza Ö. Excitation spectra of fully correlated donor-acceptor complexes by density matrix renormalisation group. Mol Phys 2022. [DOI: 10.1080/00268976.2022.2130834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/10/2022]
Affiliation(s)
- Gergely Barcza
- Wigner Research Centre for Physics, Budapest, Hungary
- Department of Chemical and Biological Engineering, The University of Alabama, Tuscaloosa, AL, USA
| | - Anton Pershin
- Wigner Research Centre for Physics, Budapest, Hungary
- Department of Atomic Physics, Institute of Physics, Budapest University of Technology and Economics, Budapest, Hungary
| | - Adam Gali
- Wigner Research Centre for Physics, Budapest, Hungary
- Department of Atomic Physics, Institute of Physics, Budapest University of Technology and Economics, Budapest, Hungary
| | - Örs Legeza
- Wigner Research Centre for Physics, Budapest, Hungary
- Fachbereich Physik, Philipps-Universität Marburg, Marburg, Germany
- Institute for Advanced Study, Technical University of Munich, Garching, Germany
| |
Collapse
|
8
|
Gillett AJ, Pershin A, Pandya R, Feldmann S, Sneyd AJ, Alvertis AM, Evans EW, Thomas TH, Cui LS, Drummond BH, Scholes GD, Olivier Y, Rao A, Friend RH, Beljonne D. Dielectric control of reverse intersystem crossing in thermally activated delayed fluorescence emitters. Nat Mater 2022; 21:1150-1157. [PMID: 35927434 PMCID: PMC7613666 DOI: 10.1038/s41563-022-01321-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Accepted: 06/13/2022] [Indexed: 05/22/2023]
Abstract
Thermally activated delayed fluorescence enables organic semiconductors with charge transfer-type excitons to convert dark triplet states into bright singlets via reverse intersystem crossing. However, thus far, the contribution from the dielectric environment has received insufficient attention. Here we study the role of the dielectric environment in a range of thermally activated delayed fluorescence materials with varying changes in dipole moment upon optical excitation. In dipolar emitters, we observe how environmental reorganization after excitation triggers the full charge transfer exciton formation, minimizing the singlet-triplet energy gap, with the emergence of two (reactant-inactive) modes acting as a vibrational fingerprint of the charge transfer product. In contrast, the dielectric environment plays a smaller role in less dipolar materials. The analysis of energy-time trajectories and their free-energy functions reveals that the dielectric environment substantially reduces the activation energy for reverse intersystem crossing in dipolar thermally activated delayed fluorescence emitters, increasing the reverse intersystem crossing rate by three orders of magnitude versus the isolated molecule.
Collapse
Affiliation(s)
| | - Anton Pershin
- Laboratory for Chemistry of Novel Materials, Université de Mons, Mons, Belgium
- Wigner Research Centre for Physics, Budapest, Hungary
| | - Raj Pandya
- Cavendish Laboratory, University of Cambridge, Cambridge, UK
| | - Sascha Feldmann
- Cavendish Laboratory, University of Cambridge, Cambridge, UK
| | | | | | - Emrys W Evans
- Cavendish Laboratory, University of Cambridge, Cambridge, UK
- Department of Chemistry, Swansea University, Swansea, UK
| | - Tudor H Thomas
- Cavendish Laboratory, University of Cambridge, Cambridge, UK
| | - Lin-Song Cui
- CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, China
| | | | | | - Yoann Olivier
- Unité de Chimie Physique Théorique et Structurale & Laboratoire de Physique du Solide, Namur Institute of Structured Matter, Université de Namur, Namur, Belgium
| | - Akshay Rao
- Cavendish Laboratory, University of Cambridge, Cambridge, UK
| | | | - David Beljonne
- Laboratory for Chemistry of Novel Materials, Université de Mons, Mons, Belgium.
| |
Collapse
|
9
|
Hall D, Sancho-García JC, Pershin A, Ricci G, Beljonne D, Zysman-Colman E, Olivier Y. Modeling of Multiresonant Thermally Activated Delayed Fluorescence Emitters─Properly Accounting for Electron Correlation Is Key! J Chem Theory Comput 2022; 18:4903-4918. [PMID: 35786892 DOI: 10.1021/acs.jctc.2c00141] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
With the surge of interest in multiresonant thermally activated delayed fluorescent (MR-TADF) materials, it is important that there exist computational methods to accurately model their excited states. Here, building on our previous work, we demonstrate how the spin-component scaling second-order approximate coupled-cluster (SCS-CC2), a wavefunction-based method, is robust at predicting the ΔEST (i.e., the energy difference between the lowest singlet S1 and triplet T1 excited states) of a large number of MR-TADF materials, with a mean average deviation (MAD) of 0.04 eV compared to experimental data. Time-dependent density functional theory calculations with the most common DFT functionals as well as the consideration of the Tamm-Dancoff approximation (TDA) consistently predict a much larger ΔEST as a result of a poorer account of Coulomb correlation as compared to SCS-CC2. Very interestingly, the use of a metric to assess the importance of higher order excitations in the SCS-CC2 wavefunctions shows that Coulomb correlation effects are substantially larger in the lowest singlet compared to the corresponding triplet and need to be accounted for a balanced description of the relevant electronic excited states. This is further highlighted with coupled cluster singles-only calculations, which predict very different S1 energies as compared to SCS-CC2 while T1 energies remain similar, leading to very large ΔEST, in complete disagreement with the experiments. We compared our SCS-CC2/cc-pVDZ with other wavefunction approaches, namely, CC2/cc-pVDZ and SOS-CC2/cc-pVDZ leading to similar performances. Using SCS-CC2, we investigate the excited-state properties of MR-TADF emitters showcasing large ΔET2T1 for the majority of emitters, while π-electron extension emerges as the best strategy to minimize ΔEST. We also employed SCS-CC2 to evaluate donor-acceptor systems that contain a MR-TADF moiety acting as the acceptor and show that the broad emission observed for some of these compounds arises from the solvent-promoted stabilization of a higher-lying charge-transfer singlet state (S2). This work highlights the importance of using wavefunction methods in relation to MR-TADF emitter design and associated photophysics.
Collapse
Affiliation(s)
- David Hall
- Organic Semiconductor Centre, EaStCHEM School of Chemistry, University of St Andrews, KY16 9ST St Andrews, U.K.,Laboratory for Chemistry of Novel Materials, University of Mons, 7000 Mons, Belgium
| | | | - Anton Pershin
- Wigner Research Centre for Physics, P.O. Box 49,Budapest 1121, Hungary
| | - Gaetano Ricci
- Laboratory for Computational Modeling of Functional Materials, Namur Institute of Structured Matter, Université de Namur, Rue de Bruxelles, 61, 5000 Namur, Belgium
| | - David Beljonne
- Laboratory for Chemistry of Novel Materials, University of Mons, 7000 Mons, Belgium
| | - Eli Zysman-Colman
- Organic Semiconductor Centre, EaStCHEM School of Chemistry, University of St Andrews, KY16 9ST St Andrews, U.K
| | - Yoann Olivier
- Laboratory for Computational Modeling of Functional Materials, Namur Institute of Structured Matter, Université de Namur, Rue de Bruxelles, 61, 5000 Namur, Belgium
| |
Collapse
|
10
|
Li S, Pershin A, Thiering G, Udvarhelyi P, Gali A. Ultraviolet Quantum Emitters in Hexagonal Boron Nitride from Carbon Clusters. J Phys Chem Lett 2022; 13:3150-3157. [PMID: 35362989 PMCID: PMC9014460 DOI: 10.1021/acs.jpclett.2c00665] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2022] [Accepted: 03/30/2022] [Indexed: 05/30/2023]
Abstract
Ultraviolet (UV) quantum emitters in hexagonal boron nitride (hBN) have generated considerable interest due to their outstanding optical response. Recent experiments have identified a carbon impurity as a possible source of UV single-photon emission. Here, on the basis of first-principles calculations, we systematically evaluate the ability of substitutional carbon defects to develop the UV color centers in hBN. Of 17 defect configurations under consideration, we particularly emphasize the carbon ring defect (6C), for which the calculated zero-phonon line agrees well the experimental 4.1 eV emission signal. We also compare the optical properties of 6C with those of other relevant defects, thereby outlining the key differences in the emission mechanism. Our findings provide new insights into the strong response of this color center to external perturbations and pave the way to a robust identification of the particular carbon substitutional defects by spectroscopic methods.
Collapse
Affiliation(s)
- Song Li
- Wigner
Research Centre for Physics, P.O. Box 49, H-1525 Budapest, Hungary
| | - Anton Pershin
- Wigner
Research Centre for Physics, P.O. Box 49, H-1525 Budapest, Hungary
| | - Gergő Thiering
- Wigner
Research Centre for Physics, P.O. Box 49, H-1525 Budapest, Hungary
| | - Péter Udvarhelyi
- Wigner
Research Centre for Physics, P.O. Box 49, H-1525 Budapest, Hungary
| | - Adam Gali
- Wigner
Research Centre for Physics, P.O. Box 49, H-1525 Budapest, Hungary
- Department
of Atomic Physics, Institute of Physics, Budapest University of Technology and Economics, Müegyetem rakpart 3, H-1111 Budapest, Hungary
| |
Collapse
|
11
|
Han S, Deng R, Gu Q, Ni L, Huynh U, Zhang J, Yi Z, Zhao B, Tamura H, Pershin A, Xu H, Huang Z, Ahmad S, Abdi-Jalebi M, Sadhanala A, Tang ML, Bakulin A, Beljonne D, Liu X, Rao A. Lanthanide-doped inorganic nanoparticles turn molecular triplet excitons bright. Nature 2020; 587:594-599. [DOI: 10.1038/s41586-020-2932-2] [Citation(s) in RCA: 85] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Accepted: 09/23/2020] [Indexed: 02/03/2023]
|
12
|
Knöller JA, Meng G, Wang X, Hall D, Pershin A, Beljonne D, Olivier Y, Laschat S, Zysman‐Colman E, Wang S. Corrigendum: Intramolecular Borylation via Sequential B−Mes Bond Cleavage for the Divergent Synthesis of B,N,B‐Doped Benzo[4]helicenes. Angew Chem Int Ed Engl 2020; 59:13149. [DOI: 10.1002/anie.202007593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
13
|
Knöller JA, Meng G, Wang X, Hall D, Pershin A, Beljonne D, Olivier Y, Laschat S, Zysman‐Colman E, Wang S. Berichtigung: Divergente Synthese von B,N,B‐Benzo[4]helicenen durch intramolekulare Borylierung unter sequenzieller B‐Mes‐Bindungsspaltung. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202007593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
14
|
Slassi A, Gali SM, Pershin A, Gali A, Cornil J, Beljonne D. Interlayer Bonding in Two-Dimensional Materials: The Special Case of SnP 3 and GeP 3. J Phys Chem Lett 2020; 11:4503-4510. [PMID: 32419458 DOI: 10.1021/acs.jpclett.0c00780] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Stacked two-dimensional (2D) heterostructures are evolving as the "next-generation" optoelectronic materials because of the possibility of designing atomically thin devices with outstanding characteristics. However, most of the existing 2D heterostructures are governed by weak van der Waals interlayer interactions that, as often is the case, exert limited impact on the resulting properties of heterostructures relative to their constituting components. In this work, we investigate the optoelectronic properties of a novel class of 2D MP3 (M = Ge and Sn) materials featuring strong interlayer interactions, applying a robust theoretical framework combining density functional theory and many-body perturbation theory. We demonstrate that the remarkable intrinsic vertical strain (of ∼40% relative to the monolayers) promotes the exfoliation of these materials into bilayers and profoundly impacts their electronic structure, charge transport, and optical properties. Most strikingly, we observe that the strong interlayer hybridization indicates continuous optical absorption across the entire visible range that, together with high charge carrier mobility, makes these 2D MP3 heterostructures attractive for photoconversion applications.
Collapse
Affiliation(s)
- Amine Slassi
- Laboratory for Chemistry of Novel Materials, Université de Mons, Place du Parc 20, 7000 Mons, Belgium
| | - Sai Manoj Gali
- Laboratory for Chemistry of Novel Materials, Université de Mons, Place du Parc 20, 7000 Mons, Belgium
| | - Anton Pershin
- Laboratory for Chemistry of Novel Materials, Université de Mons, Place du Parc 20, 7000 Mons, Belgium
- Wigner Research Centre for Physics, PO Box 49, H-1525 Budapest, Hungary
| | - Adam Gali
- Wigner Research Centre for Physics, PO Box 49, H-1525 Budapest, Hungary
- Department of Atomic Physics, Budapest University of Technology and Economics, Budafoki út 8, H-1111 Budapest, Hungary
| | - Jérôme Cornil
- Laboratory for Chemistry of Novel Materials, Université de Mons, Place du Parc 20, 7000 Mons, Belgium
| | - David Beljonne
- Laboratory for Chemistry of Novel Materials, Université de Mons, Place du Parc 20, 7000 Mons, Belgium
| |
Collapse
|
15
|
Knöller JA, Meng G, Wang X, Hall D, Pershin A, Beljonne D, Olivier Y, Laschat S, Zysman‐Colman E, Wang S. Intramolecular Borylation via Sequential B−Mes Bond Cleavage for the Divergent Synthesis of B,N,B‐Doped Benzo[4]helicenes. Angew Chem Int Ed Engl 2020; 59:3156-3160. [DOI: 10.1002/anie.201912340] [Citation(s) in RCA: 63] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Indexed: 11/11/2022]
Affiliation(s)
- Julius A. Knöller
- Department of ChemistryQueen's University 90 Bader Lane Kingston Ontario K7L 3N6 Canada
- Institute for Organic ChemistryStuttgart University Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Guoyun Meng
- School of Chemistry and Chemical EngineeringBeijing Institute of Technology Beijing China
| | - Xiang Wang
- Department of ChemistryQueen's University 90 Bader Lane Kingston Ontario K7L 3N6 Canada
| | - David Hall
- Organic Semiconductor CentreEaStCHEM School of ChemistryUniversity of St Andrews St Andrews KY16 9ST UK
- Laboratory for Chemistry of Novel MaterialsUniversity of Mons 7000 Mons Belgium
| | - Anton Pershin
- Laboratory for Chemistry of Novel MaterialsUniversity of Mons 7000 Mons Belgium
| | - David Beljonne
- Laboratory for Chemistry of Novel MaterialsUniversity of Mons 7000 Mons Belgium
| | - Yoann Olivier
- Unité de Chimie Physique Théorique et Structurale & Laboratoire de Physique du SolideNamur Institute of Structured MatterUniversité de Namur Rue de Bruxelles, 61 5000 Namur Belgium
| | - Sabine Laschat
- Institute for Organic ChemistryStuttgart University Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Eli Zysman‐Colman
- Organic Semiconductor CentreEaStCHEM School of ChemistryUniversity of St Andrews St Andrews KY16 9ST UK
| | - Suning Wang
- Department of ChemistryQueen's University 90 Bader Lane Kingston Ontario K7L 3N6 Canada
- School of Chemistry and Chemical EngineeringBeijing Institute of Technology Beijing China
| |
Collapse
|
16
|
Knöller JA, Meng G, Wang X, Hall D, Pershin A, Beljonne D, Olivier Y, Laschat S, Zysman‐Colman E, Wang S. Divergente Synthese von B,N,B‐Benzo[4]helicenen durch intramolekulare Borylierung unter sequenzieller B‐Mes‐Bindungsspaltung. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201912340] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Julius A. Knöller
- Department of Chemistry Queen's University 90 Bader Lane Kingston Ontario K7L 3N6 Kanada
- Institut für Organische Chemie Universität Stuttgart Deutschland
| | - Guoyun Meng
- School of Chemistry and Chemical Engineering Beijing Institute of Technology Peking China
| | - Xiang Wang
- Department of Chemistry Queen's University 90 Bader Lane Kingston Ontario K7L 3N6 Kanada
| | - David Hall
- Organic Semiconductor Centre EaStCHEM School of Chemistry University of St Andrews St Andrews KY16 9ST Großbritannien
- Laboratory for Chemistry of Novel Materials University of Mons Belgien
| | - Anton Pershin
- Laboratory for Chemistry of Novel Materials University of Mons Belgien
| | - David Beljonne
- Laboratory for Chemistry of Novel Materials University of Mons Belgien
| | - Yoann Olivier
- Unité de Chimie Physique Théorique et Structurale, & Laboratoire de Physique du Solide Namur Institute of Structured Matter Université de Namur Belgien
| | - Sabine Laschat
- Institut für Organische Chemie Universität Stuttgart Deutschland
| | - Eli Zysman‐Colman
- Organic Semiconductor Centre EaStCHEM School of Chemistry University of St Andrews St Andrews KY16 9ST Großbritannien
| | - Suning Wang
- Department of Chemistry Queen's University 90 Bader Lane Kingston Ontario K7L 3N6 Kanada
- School of Chemistry and Chemical Engineering Beijing Institute of Technology Peking China
| |
Collapse
|
17
|
Bertolazzi S, Bonacchi S, Nan G, Pershin A, Beljonne D, Samorì P. Engineering Chemically Active Defects in Monolayer MoS 2 Transistors via Ion-Beam Irradiation and Their Healing via Vapor Deposition of Alkanethiols. Adv Mater 2017; 29:1606760. [PMID: 28247435 DOI: 10.1002/adma.201606760] [Citation(s) in RCA: 84] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Revised: 01/26/2017] [Indexed: 06/06/2023]
Abstract
Irradiation of 2D sheets of transition metal dichalcogenides with ion beams has emerged as an effective approach to engineer chemically active defects in 2D materials. In this context, argon-ion bombardment has been utilized to introduce sulfur vacancies in monolayer molybdenum disulfide (MoS2 ). However, a detailed understanding of the effects of generated defects on the functional properties of 2D MoS2 is still lacking. In this work, the correlation between critical electronic device parameters and the density of sulfur vacancies is systematically investigated through the fabrication and characterization of back-gated monolayer MoS2 field-effect transistors (FETs) exposed to a variable fluence of low-energy argon ions. The electrical properties of pristine and ion-irradiated FETs can be largely improved/recovered by exposing the devices to vapors of short linear thiolated molecules. Such a solvent-free chemical treatment-carried out strictly under inert atmosphere-rules out secondary healing effects induced by oxygen or oxygen-containing molecules. The results provide a guideline to design monolayer MoS2 optoelectronic devices with a controlled density of sulfur vacancies, which can be further exploited to introduce ad hoc molecular functionalities by means of thiol chemistry approaches.
Collapse
Affiliation(s)
- Simone Bertolazzi
- University of Strasbourg, CNRS, ISIS UMR 7006, 8 allée Gaspard Monge, F-67000, Strasbourg, France
| | - Sara Bonacchi
- University of Strasbourg, CNRS, ISIS UMR 7006, 8 allée Gaspard Monge, F-67000, Strasbourg, France
| | - Guangjun Nan
- Laboratory for Chemistry of Novel Materials, Université de Mons, Place du Parc 20, 7000, Mons, Belgium
| | - Anton Pershin
- Laboratory for Chemistry of Novel Materials, Université de Mons, Place du Parc 20, 7000, Mons, Belgium
| | - David Beljonne
- Laboratory for Chemistry of Novel Materials, Université de Mons, Place du Parc 20, 7000, Mons, Belgium
| | - Paolo Samorì
- University of Strasbourg, CNRS, ISIS UMR 7006, 8 allée Gaspard Monge, F-67000, Strasbourg, France
| |
Collapse
|
18
|
Pershin A, Szalay PG. Improving the Accuracy of the Charge Transfer Integrals Obtained by Coupled Cluster Theory, MBPT(2), and TDDFT. J Chem Theory Comput 2015; 11:5705-11. [DOI: 10.1021/acs.jctc.5b00837] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Anton Pershin
- Laboratory for Theoretical
Chemistry, Institute of Chemistry, Eötvös Loránd University, P.O. Box 32, H-1518 Budapest, Hungary
| | - Péter G. Szalay
- Laboratory for Theoretical
Chemistry, Institute of Chemistry, Eötvös Loránd University, P.O. Box 32, H-1518 Budapest, Hungary
| |
Collapse
|
19
|
Affiliation(s)
- Anton Pershin
- Laboratory for Theoretical Chemistry, Institute of Chemistry, Eötvös Loránd University, P.O. Box 32, H-1518 Budapest, Hungary
| | - Péter G. Szalay
- Laboratory for Theoretical Chemistry, Institute of Chemistry, Eötvös Loránd University, P.O. Box 32, H-1518 Budapest, Hungary
| |
Collapse
|
20
|
Donets S, Pershin A, Baeurle SA. Optimizing the fabrication process and interplay of device components of polymer solar cells using a field-based multiscale solar-cell algorithm. J Chem Phys 2015; 142:184902. [DOI: 10.1063/1.4919649] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Affiliation(s)
- Sergii Donets
- Institute of Physical and Theoretical Chemistry, University of Regensburg, D-93040 Regensburg, Germany
| | - Anton Pershin
- Institute of Physical and Theoretical Chemistry, University of Regensburg, D-93040 Regensburg, Germany
| | - Stephan A. Baeurle
- Institute of Physical and Theoretical Chemistry, University of Regensburg, D-93040 Regensburg, Germany
| |
Collapse
|
21
|
Mur L, Igolkin A, Varentsova A, Pershin A, Remyga S, Shevchenko I, Zhukov I, Sánchez-Vizcaíno JM. Detection of African Swine Fever Antibodies in Experimental and Field Samples from the Russian Federation: Implications for Control. Transbound Emerg Dis 2014; 63:e436-40. [PMID: 25440300 DOI: 10.1111/tbed.12304] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Indexed: 11/29/2022]
Abstract
African swine fever (ASF) re-entered in Europe in 2007 by Georgia rapidly affecting neighbouring countries. Since then, ASF has caused severe problems to the Russian Federation (RF) and spread to Northern and Western regions, including Ukraine (2012 and 2014) and Belarus (2013). At the beginning of 2014, dead wild boars were found in Lithuania and Poland. Several outbreaks have been later notified in the European Union(EU), affecting domestic pigs and wild boar of Latvia, Lithuania and Poland, and also wild boar in Estonia, causing major problems for the EU pig sector. Some studies have been performed with this ASFV isolate, revealing that it belongs to genotype II and causes an acute form of the disease. However, few data are available about the presence of antibodies in field and experimental samples from the affected area. This study analysed samples from experimental infections with ASFV isolated from the RF in 2013 (74 sera and 3 tissue exudates), and field samples from the RF from 2013 to 2014 (266 samples, including 32 and 7 tissue exudates from domestic pigs and wild boar, respectively). All samples were tested by a commercial ELISA and, some of them (79), also by immunochromatographic tests. Positive and doubtful samples were confirmed by immunoblotting test. Positive results were found in experimental and field samples, which confirm the presence of antibodies against ASFV in the RF. Antibodies were detected in animals inoculated with three different ASFV isolates, with some differences found among them. Only a small percentage of field samples was positive for ASF antibodies (3.7%), in agreement with other observations that reported a high virulence for the ASFV isolates in the area. These results confirm the potential presence of survivor animals that should be considered in affected areas to help design effective control and eradication plans against ASF.
Collapse
Affiliation(s)
- L Mur
- VISAVET Center and Animal Health Department, Veterinary School, Universidad Complutense de Madrid, Madrid, Spain
| | - A Igolkin
- Federal Center for Animal Health FGBI "ARRIAH", Vladimir, Russia
| | - A Varentsova
- Federal Center for Animal Health FGBI "ARRIAH", Vladimir, Russia
| | - A Pershin
- Federal Center for Animal Health FGBI "ARRIAH", Vladimir, Russia
| | - S Remyga
- Federal Center for Animal Health FGBI "ARRIAH", Vladimir, Russia
| | - I Shevchenko
- Federal Center for Animal Health FGBI "ARRIAH", Vladimir, Russia
| | - I Zhukov
- Federal Center for Animal Health FGBI "ARRIAH", Vladimir, Russia
| | - J M Sánchez-Vizcaíno
- VISAVET Center and Animal Health Department, Veterinary School, Universidad Complutense de Madrid, Madrid, Spain
| |
Collapse
|
22
|
Pershin A, Donets S, Baeurle SA. Photocurrent contribution from inter-segmental mixing in donor–acceptor-type polymer solar cells: A multiscale simulation study. POLYMER 2014. [DOI: 10.1016/j.polymer.2014.06.038] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
23
|
Donets S, Pershin A, Christlmaier MJA, Baeurle SA. A multiscale modeling study of loss processes in block-copolymer-based solar cell nanodevices. J Chem Phys 2013; 138:094901. [PMID: 23485320 DOI: 10.1063/1.4792366] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Flexible photovoltaic devices possess promising perspectives in opto-electronic technologies, where high mobility and/or large-scale applicability are important. However, their usefulness in such applications is currently still limited due to the low level of optimization of their performance and durability. For the improvement of these properties, a better understanding and control of small-scale annihilation phenomena involved in the photovoltaic process, such as exciton loss and charge carrier loss, is necessary, which typically implicates multiple length- and time-scales. Here, we study the causes for their occurrence on the example of nanostructured diblock- and triblock-copolymer systems by making use of a novel solar-cell simulation algorithm and explore new routes to optimize their photovoltaic properties. A particular focus is set on the investigation of exciton and charge carrier loss phenomena and their dependence on the inter-monomeric interaction strength, chain architecture, and external mechanical loading. Our simulation results reveal that in the regime from low up to intermediate χ-parameters an increasing number of continuous percolation paths is created. In this parameter range, the internal quantum efficiency (IQE) increases up to a maximum, characterized by a minimum in the number of charge losses due to charge recombination. In the regime of high χ-parameters both block-copolymer systems form nanostructures with a large number of bottlenecks and dead ends. These lead to a large number of charge losses due to charge recombination, charge trapping, and a deteriorated exciton dissociation, resulting in a significant drop in the IQE. Moreover, we find that the photovoltaic performance of the triblock-copolymer material decreases with increasing mechanical loading, caused by a growing number of charge losses due to charge recombination and charge accumulation. Finally, we demonstrate that the process of charge trapping in defects can be reversed by changing the polarity of the electrodes, which confers these materials the ability to be used as charge storage media.
Collapse
Affiliation(s)
- Sergii Donets
- Department of Chemistry and Pharmacy, Institute of Physical and Theoretical Chemistry, University of Regensburg, D-93040 Regensburg, Germany
| | | | | | | |
Collapse
|
24
|
Pershin A, Donets S, Baeurle SA. A new multiscale modeling method for simulating the loss processes in polymer solar cell nanodevices. J Chem Phys 2012; 136:194102. [DOI: 10.1063/1.4712622] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|