1
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Wan X, Pan D, Zong Z, Qin Y, Lü JT, Volz S, Zhang L, Yang N. Modulating Thermal Conductivity via Targeted Phonon Excitation. NANO LETTERS 2024. [PMID: 38739156 DOI: 10.1021/acs.nanolett.4c00478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2024]
Abstract
Thermal conductivity is a critical material property in numerous applications, such as those related to thermoelectric devices and heat dissipation. Effectively modulating thermal conductivity has become a great concern in the field of heat conduction. Here, a quantum modulation strategy is proposed to modulate the thermal conductivity/heat flux by exciting targeted phonons. It shows that the thermal conductivity of graphene can be tailored in the range of 1559 W m-1 K-1 (decreased to 49%) to 4093 W m-1 K-1 (increased to 128%), compared with the intrinsic value of 3189 W m-1 K-1. The effects are also observed for graphene nanoribbons and bulk silicon. The results are obtained through both density functional theory calculations and molecular dynamics simulations. This novel modulation strategy may pave the way for quantum heat conduction.
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Affiliation(s)
- Xiao Wan
- School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Dongkai Pan
- School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Zhicheng Zong
- School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Yangjun Qin
- School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Jing-Tao Lü
- School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Sebastian Volz
- LIMMS, CNRS-IIS UMI 2820, The University of Tokyo, Tokyo 153-8505, Japan
- Institute of Industrial Science, The University of Tokyo, Tokyo 153-8505, Japan
| | - Lifa Zhang
- Phonon Engineering Research Center of Jiangsu Province, Ministry of Education Key Laboratory of NSLSCS, Center for Quantum Transport and Thermal Energy Science, Institute of Physics Frontiers and Interdisciplinary Sciences, School of Physics and Technology, Nanjing Normal University, Nanjing 210023, People's Republic of China
| | - Nuo Yang
- School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
- Department of Physics, National University of Defense Technology, Changsha 410073, People's Republic of China
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2
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Oubram O. Gap engineering effects on transport and tunneling magnetoresistance properties in phosphorene ferromagnetic/normal/ferromagnetic junction. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2024; 36:225302. [PMID: 38408380 DOI: 10.1088/1361-648x/ad2d22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2023] [Accepted: 02/26/2024] [Indexed: 02/28/2024]
Abstract
Tuning the band gap is of utmost importance for the practicality of two-dimensional materials in the semiconductor industry. In this study, we investigate the ballistic transport and the tunneling magnetoresistance (TMR) properties within a modulated gap in a ferromagnetic/normal/ferromagnetic (F/N/F) phosphorene junction. The theoretical framework is established on a Dirac-like Hamiltonian, the transfer matrix method, and the Landauer-Büttiker formalism to characterize electron behavior and obtain transmittance, conductance and TMR. Our results reveal that a reduction in gap energy leads to an enhancement of conductance for both parallel and anti-parallel magnetization configurations. In contrast, a significant reduction and redshift in TMR have been observed. Notably, the application of an electrostatic field in a gapless phosphorene F/N/F junction induces a blueshift and a slight increase in TMR. Furthermore, we found that introducing an asymmetrically applied electrostatic field in this gapless junction results in a significant reduction and redshift in TMR. Additionally, intensifying the applied magnetic field leads to a substantial increase in TMR. These findings could be useful for designing and implementing practical applications that require precise control over the TMR properties of a phosphorene F/N/F junction with a modulated gap.
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Affiliation(s)
- O Oubram
- Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma Del Estado de Morelos, Av. Universidad 1001, Col. Chamilpa 62209, Cuernavaca, Morelos, Mexico
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3
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Han X, Zhao Q, Yan X, Meng T, He J. Blocking recombination centers by controlling the charge density of a sulfur vacancy in antimony trisulfide. Phys Chem Chem Phys 2023; 25:32622-32631. [PMID: 38009229 DOI: 10.1039/d3cp05217f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2023]
Abstract
By performing nonadiabatic molecular dynamics combined with ab initio time-domain density functional theory, we have explored the effects of the charge density of a sulfur vacancy on charge trapping and recombination in antimony trisulfide (Sb2S3). The simulations demonstrate that, compared to an antimony vacancy, the sulfur vacancy generates a high charge density trap state within the band gap. This state acts as the recombination center and provides new channels for charge carrier relaxation. Filling the sulfur vacancy with electron donors elevates the defect state to the Fermi level due to the introduced extra electrons. In contrast, the electron acceptor lowers the charge density of the sulfur vacancy by capturing its local electrons, eliminating the charge recombination center and extending the photo-generated charge carrier lifetime. Additionally, compared with electron injection, hole injection can also decrease the charge density of the trap state via neutralizing its local electronic states, eliminate the trap state within the band gap, and suppress nonradiative electron-hole recombination. This study is expected to shed new light on the blocking recombination centers and provide valuable insights into the design of high-performance solar cells.
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Affiliation(s)
- Xiao Han
- College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, P. R. China.
| | - Qi Zhao
- College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, P. R. China.
| | - Xiaodan Yan
- College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, P. R. China.
| | - Ting Meng
- College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, P. R. China.
| | - Jinlu He
- College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, P. R. China.
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4
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Yao Y, Li Q, Chu W, Ding YM, Yan L, Gao Y, Neogi A, Govorov A, Zhou L, Wang Z. Exploration of the origin of the excellent charge-carrier dynamics in Ruddlesden-Popper oxysulfide perovskite Y 2Ti 2O 5S 2. Phys Chem Chem Phys 2023. [PMID: 38051151 DOI: 10.1039/d3cp02860g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2023]
Abstract
Although the efficient separation of electron-hole (e-h) pairs is one of the most sought-after electronic characteristics of materials, due to thermally induced atomic motion and other factors, they do not remain separated during the carrier transport process, potentially leading to rapid carrier recombination. Here, we utilized real-time time-dependent density functional theory in combination with nonadiabatic molecular dynamics (NAMD) to explore the separated dynamic transport path within Ruddlesden-Popper oxysulfide perovskite Y2Ti2O5S2 caused by the dielectric layer and phonon frequency difference. The underlying origin of the efficient overall water splitting in Y2Ti2O5S2 is systematically explored. We report the existence of the bi-directional e-h separate-path transport, in which, the electrons transport in the Ti2O5 layer and the holes diffuse in the rock-salt layer. This is in contrast to the conventional e-h separated distribution with a crowded transport channel, as observed in SrTiO3 and hybrid perovskites. Such a unique feature finally results in a long carrier lifetime of 321 ns, larger than that in the SrTiO3 perovskite (160 ns) with only one carrier transport channel. This work provides insights into the carrier transport in lead-free perovskites and yields a novel design strategy for next-generation functionalized optoelectronic devices.
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Affiliation(s)
- Yisen Yao
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313001, China.
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China
| | - Qiaoqiao Li
- School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China
| | - Weibin Chu
- Key Laboratory of Computational Physical Sciences (Ministry of Education), Institute of Computational Physical Sciences, Fudan University, Shanghai 200433, China
| | - Yi-Min Ding
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313001, China.
| | - Luo Yan
- School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China
| | - Yang Gao
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313001, China.
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China
| | - Arup Neogi
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China
| | - Alexander Govorov
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China
- Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA.
| | - Liujiang Zhou
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313001, China.
- School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China
| | - Zhiming Wang
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313001, China.
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China
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5
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Zhang H, Diao J, Liu Y, Zhao H, Ng BKY, Ding Z, Guo Z, Li H, Jia J, Yu C, Xie F, Henkelman G, Titirici MM, Robertson J, Nellist P, Duan C, Guo Y, Riley DJ, Qiu J. In-Situ-Grown Cu Dendrites Plasmonically Enhance Electrocatalytic Hydrogen Evolution on Facet-Engineered Cu 2 O. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2305742. [PMID: 37667462 DOI: 10.1002/adma.202305742] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Revised: 08/29/2023] [Indexed: 09/06/2023]
Abstract
Herein, facet-engineered Cu2 O nanostructures are synthesized by wet chemical methods for electrocatalytic HER, and it is found that the octahedral Cu2 O nanostructures with exposed crystal planes of (111) (O-Cu2 O) has the best hydrogen evolution performance. Operando Raman spectroscopy and ex-situ characterization techniques showed that Cu2 O is reduced during HER, in which Cu dendrites are grown on the surface of the Cu2 O nanostructures, resulting in the better HER performance of O-Cu2 O after HER (O-Cu2 O-A) compared with that of the as-prepared O-Cu2 O. Under illumination, the onset potential of O-Cu2 O-A is ca. 52 mV positive than that of O-Cu2 O, which is induced by the plasmon-activated electrochemical system consisting of Cu2 O and the in-situ generated Cu dendrites. Incident photon-to-current efficiency (IPCE) measurements and the simulated UV-Vis spectrum demonstrate the hot electron injection (HEI) from Cu dendrites to Cu2 O. Ab initio nonadiabatic molecular dynamics (NAMD) simulations revealed the transfer of photogenerated electrons (27 fs) from Cu dendrites to Cu2 O nanostructures is faster than electron relaxation (170 fs), enhancing its surface plasmons activity, and the HEI of Cu dendrites increases the charge density of Cu2 O. These make the energy level of the catalyst be closer to that of H+ /H2 , evidenced by the plasmon-enhanced HER electrocatalytic activity.
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Affiliation(s)
- Hao Zhang
- Department of Materials and London Center for Nanotechnology, Imperial College London, London, SW7 2AZ, UK
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, OX1 3TA, UK
| | - Jiefeng Diao
- Department of Chemistry and the Oden Institute for Computational Engineering and Sciences, The University of Texas at Austin, Austin, TX, 78712, USA
| | - Yonghui Liu
- School of Electrical Engineering and Automation, Wuhan University, Wuhan, 430072, P. R. China
| | - Han Zhao
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, Zurich, CH-8057, Switzerland
| | - Bryan K Y Ng
- Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford, OX1 3QR, UK
| | - Zhiyuan Ding
- Department of Materials, University of Oxford, Oxford, OX1 3PH, UK
| | - Zhenyu Guo
- Department of Chemical Engineering, Imperial College London, London, SW7 2AZ, UK
| | - Huanxin Li
- Department of Engineering, University of Cambridge, Cambridge, CB2 1PZ, UK
| | - Jun Jia
- School of Electrical Engineering and Automation, Wuhan University, Wuhan, 430072, P. R. China
| | - Chang Yu
- State Key Lab of Fine Chemicals, School of Chemical Engineering, Liaoning Key Lab for Energy Materials and Chemical Engineering, Dalian University of Technology, Dalian, 116024, P. R. China
| | - Fang Xie
- Department of Materials and London Center for Nanotechnology, Imperial College London, London, SW7 2AZ, UK
| | - Graeme Henkelman
- Department of Chemistry and the Oden Institute for Computational Engineering and Sciences, The University of Texas at Austin, Austin, TX, 78712, USA
| | | | - John Robertson
- School of Electrical Engineering and Automation, Wuhan University, Wuhan, 430072, P. R. China
- Department of Engineering, University of Cambridge, Cambridge, CB2 1PZ, UK
| | - Peter Nellist
- Department of Materials, University of Oxford, Oxford, OX1 3PH, UK
| | - Chunying Duan
- School of Chemistry, Dalian University of Technology, Dalian, Liaoning, 116024, P. R. China
| | - Yuzheng Guo
- School of Electrical Engineering and Automation, Wuhan University, Wuhan, 430072, P. R. China
| | - D Jason Riley
- Department of Materials and London Center for Nanotechnology, Imperial College London, London, SW7 2AZ, UK
| | - Jieshan Qiu
- State Key Lab of Fine Chemicals, School of Chemical Engineering, Liaoning Key Lab for Energy Materials and Chemical Engineering, Dalian University of Technology, Dalian, 116024, P. R. China
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Ghosh A, Goswami B, Pal S, Sarkar P. How the Stacking Pattern Influences the Charge Transfer Dynamics of van der Waals Heterostructures: An Answer from a Time-Domain Ab Initio Study. J Phys Chem Lett 2023; 14:7672-7679. [PMID: 37603897 DOI: 10.1021/acs.jpclett.3c01626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/23/2023]
Abstract
Here, we perform a time domain density functional study in conjunction with a non-adiabatic molecular dynamics (NAMD) simulation to investigate the charge carrier dynamics in a series of van der Waals heterostructures made of two-dimensional (2D) SnX2 (X = S or Se)-supported ZrS2, ZrSe2, and ZrSSe monolayers. Results from NAMD simulation reveal delayed electron-hole recombination (in the range of 0.53-2.13 ns) and ultrafast electron/hole transfer processes (electron transfer within 108.3-321.5 fs and hole transfer between 107.6 and 258.8 fs). The most interesting finding of our study is that switching from AB to AA stacking in the heterostructures extends the carrier lifespan by a significant amount. The delayed electron-hole recombination because of the switching stacking pattern can be rationalized by weak electron-phonon coupling, lower non-adiabatic coupling (NAC), and fast decoherence time. Thus, these insightful NAMD studies of excited charge carriers reveal that the stacking pattern variation is an effective tool to develop efficient photovoltaic devices based on 2D van der Waals heterostructures.
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Affiliation(s)
- Atish Ghosh
- Department of Chemistry, Visva-Bharati University, Santiniketan 731235, India
| | - Biplab Goswami
- Department of Physics, Sreegopal Banerjee College, Bagati, Hoogly 712148, India
| | - Sougata Pal
- Department of Chemistry, University of Gour Banga, Malda 732103, India
| | - Pranab Sarkar
- Department of Chemistry, Visva-Bharati University, Santiniketan 731235, India
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7
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Guo H, Zhang X, Lu G. Pseudo-heterostructure and condensation of 1D moiré excitons in twisted phosphorene bilayers. SCIENCE ADVANCES 2023; 9:eadi5404. [PMID: 37478184 PMCID: PMC10361592 DOI: 10.1126/sciadv.adi5404] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Accepted: 06/20/2023] [Indexed: 07/23/2023]
Abstract
Heterostructures are not expected to form in a single homogeneous material. Here, we show that planar pseudo-heterostructures could emerge in a twisted bilayer of phosphorene (tbP), driving in-plane energy and charge transfer. The formation of moiré superlattices combined with electronic anisotropy in tbPs yields one-dimensional (1D) moiré excitons with long radiative and nonradiative lifetimes, large binding energies, and deep moiré potentials. Low-frequency moiré phonons and dynamic moiré potentials are revealed to be responsible for the in-plane energy/charge transfer and exciton dynamics. The 1D moiré excitons are predicted to exhibit Bose-Einstein condensation at high temperatures and may lead to exotic Tonks-Girardeau Bose gases.
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Affiliation(s)
- Hongli Guo
- Department of Physics and Astronomy, California State University Northridge, Northridge, CA 91330-8268, USA
| | - Xu Zhang
- Department of Physics and Astronomy, California State University Northridge, Northridge, CA 91330-8268, USA
| | - Gang Lu
- Department of Physics and Astronomy, California State University Northridge, Northridge, CA 91330-8268, USA
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8
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Botella R, Kistanov AA. A Unified View of Vibrational Spectroscopy Simulation through Kernel Density Estimations. J Phys Chem Lett 2023; 14:3691-3697. [PMID: 37037010 PMCID: PMC10123815 DOI: 10.1021/acs.jpclett.3c00665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Accepted: 03/30/2023] [Indexed: 06/19/2023]
Abstract
To date, vibrational simulation results constitute more of an experimental support than a predictive tool, as the simulated vibrational modes are discrete due to quantization. This is different from what is obtained experimentally. Here, we propose a way to combine outputs such as the phonon density of states surrogate and peak intensities obtained from ab initio simulations to allow comparison with experimental data by using machine learning. This work is paving the way for using simulated vibrational spectra as a tool to identify materials with defined stoichiometry, enabling the separation of genuine vibrational features of pure phases from morphological and defect-induced signals.
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9
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Ghoshal S, Ghosh A, Roy P, Ball B, Pramanik A, Sarkar P. Recent Progress in Computational Design of Single-Atom/Cluster Catalysts for Electrochemical and Solar-Driven N 2 Fixation. ACS Catal 2022. [DOI: 10.1021/acscatal.2c04527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Sourav Ghoshal
- Department of Chemistry, Visva-Bharati University, Santiniketan731 235, India
| | - Atish Ghosh
- Department of Chemistry, Visva-Bharati University, Santiniketan731 235, India
| | - Prodyut Roy
- Department of Chemistry, Visva-Bharati University, Santiniketan731 235, India
| | - Biswajit Ball
- Department of Chemistry, Visva-Bharati University, Santiniketan731 235, India
| | - Anup Pramanik
- Department of Chemistry, Sidho-Kanho-Birsha University, Purulia723 104, India
| | - Pranab Sarkar
- Department of Chemistry, Visva-Bharati University, Santiniketan731 235, India
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10
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Zeng L, Zhang S, Yao L, Bi Z, Zhang Y, Kang P, Yan J, Zhang Z, Yun J. A type-II NGyne/GaSe heterostructure with high carrier mobility and tunable electronic properties for photovoltaic application. NANOTECHNOLOGY 2022; 34:065702. [PMID: 36356303 DOI: 10.1088/1361-6528/aca1cc] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Accepted: 11/10/2022] [Indexed: 06/16/2023]
Abstract
The two-dimensional heterostructures with type-II band alignment and super-high carrier mobility offer an updated perspective for photovoltaic devices. Here, based on the first-principles calculation, a novel vertical NGyne/GaSe heterostructure with an intrinsic type-II band alignment, super-high carrier mobility (104cm2V-1s-1), and strong visible to ultraviolet light absorption (104-105cm-1) is constructed. We investigate the electronic structure and the interfacial properties of the NGyne/GaSe heterostructure under electric field and strain. The band offsets and band gap of the NGyne/GaSe heterostructure can be regulated under applied vertical electric field and strain efficiently. Further study reveals that the photoelectric conversion efficiency of the NGyne/GaSe heterostructure is vastly improved under a negative electric field and reaches up to 25.09%. Meanwhile, near-free electron states are induced under a large applied electric field, leading to the NGyne/GaSe heterostructure transform from semiconductors to metal. Our results indicate that the NGyne/GaSe heterostructure will have extremely potential in optoelectronic devices, especially solar cells.
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Affiliation(s)
- Liru Zeng
- School of Information Science and Technology, Northwest University, Xi'an, 710127, People's Republic of China
| | - Siyu Zhang
- School of Information Science and Technology, Northwest University, Xi'an, 710127, People's Republic of China
| | - Linwei Yao
- School of Information Science and Technology, Northwest University, Xi'an, 710127, People's Republic of China
| | - Zhisong Bi
- School of Information Science and Technology, Northwest University, Xi'an, 710127, People's Republic of China
| | - Yanni Zhang
- College of Physics & Electronic Engineering, Xianyang Normal University, Xianyang, 712000, People's Republic of China
| | - Peng Kang
- Department of Physics, McGill University, Montreal, Quebec H3A 2T8, Canada
| | - Junfeng Yan
- School of Information Science and Technology, Northwest University, Xi'an, 710127, People's Republic of China
| | - Zhiyong Zhang
- School of Information Science and Technology, Northwest University, Xi'an, 710127, People's Republic of China
| | - Jiangni Yun
- School of Information Science and Technology, Northwest University, Xi'an, 710127, People's Republic of China
- Department of Physics, McGill University, Montreal, Quebec H3A 2T8, Canada
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11
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Dou W, Zhang L, Song B, Hua C, Wu M, Niu T, Zhou M. Vacancy-Regulated Charge Carrier Dynamics and Suppressed Nonradiative Recombination in Two-Dimensional ReX 2 (X = S, Se). J Phys Chem Lett 2022; 13:10656-10665. [PMID: 36354193 DOI: 10.1021/acs.jpclett.2c02796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Point defects in semiconductors usually act as nonradiative charge carrier recombination centers, which severely limit the performance of optoelectronic devices. In this work, by combining time-domain density functional theory with nonadiabatic molecular dynamics simulations, we demonstrate suppressed nonradiative charge carrier recombination and prolonged carrier lifetime in two-dimensional (2D) ReX2 (X = S, Se) with S/Se vacancies. In particular, a S vacancy introduces a shallow hole trap state in ReS2, while a Se vacancy introduces both hole and electron trap states in ReSe2. Photoexcited electrons and holes can be rapidly captured by these defect states, while the release process is slow, which contributes to an elongated photocarrier lifetime. The suppressed charge carrier recombination lies in the vacancy-induced low-frequency phonon modes that weaken electron-phonon coupling, as well as the reduced overlap between electron and hole wave functions that decreases nonadiabatic coupling. This work provides physical insights into the charge carrier dynamics of 2D ReX2, which may stimulate considerable interest in using defect engineering for future optoelectronic nanodevices.
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Affiliation(s)
- Wenzhen Dou
- School of Physics, Beihang University, Beijing100191, China
- Beihang Hangzhou Innovation Institute Yuhang, Hangzhou310023, China
| | - Ling Zhang
- School of Physics, Beihang University, Beijing100191, China
| | - Biyu Song
- School of Physics, Beihang University, Beijing100191, China
- Beihang Hangzhou Innovation Institute Yuhang, Hangzhou310023, China
| | - Chenqiang Hua
- Beihang Hangzhou Innovation Institute Yuhang, Hangzhou310023, China
| | - Meimei Wu
- Beihang Hangzhou Innovation Institute Yuhang, Hangzhou310023, China
| | - Tianchao Niu
- Beihang Hangzhou Innovation Institute Yuhang, Hangzhou310023, China
| | - Miao Zhou
- School of Physics, Beihang University, Beijing100191, China
- Beihang Hangzhou Innovation Institute Yuhang, Hangzhou310023, China
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12
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Ghosh A, Ball B, Pal S, Sarkar P. Ultrafast Charge Transfer and Delayed Recombination in Graphitic-CN/WTe 2 van der Waals Heterostructure: A Time Domain Ab Initio Study. J Phys Chem Lett 2022; 13:7898-7905. [PMID: 35980156 DOI: 10.1021/acs.jpclett.2c02196] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
In search of an efficient solar energy harvester, we herein performed a time domain density functional study coupled with nonadiabatic molecular dynamics (NAMD) simulation to gain atomistic insight into the charge carrier dynamics of a graphitic carbon nitride (g-CN)-tungsten telluride (WTe2) van der Waals heterostructure. Our NAMD study predicted ultrafast electron (589 fs) and hole-transfer (807 fs) dynamics in g-CN/WTe2 heterostructure and a delayed electron-hole recombination process (2.404 ns) as compared to that of the individual g-CN (3 ps) and WTe2 (0.55 ps) monolayer. The ultrafast charge transfer is due to strong electron-phonon coupling during the charge-transfer process while comparatively weak electron-phonon coupling, sufficient band gap, comparatively lower nonadiabatic coupling (NAC), and fast decoherence time slow down the electron-hole recombination process. The NAMD results of exciton relaxation dynamics are valuable for insightful understanding of charge carrier dynamics and in designing photovoltaic devices based on organic-inorganic 2D van der Waals heterostructures.
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Affiliation(s)
- Atish Ghosh
- Department of Chemistry, Visva-Bharati University, Santiniketan 731235, India
| | - Biswajit Ball
- Department of Chemistry, Visva-Bharati University, Santiniketan 731235, India
| | - Sougata Pal
- Department of Chemistry, University of Gour Banga, Malda 732103, India
| | - Pranab Sarkar
- Department of Chemistry, Visva-Bharati University, Santiniketan 731235, India
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13
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Wang X, Gao W, Zhao J. Strain modulation of the exciton anisotropy and carrier lifetime in black phosphorene. Phys Chem Chem Phys 2022; 24:10860-10868. [PMID: 35437538 DOI: 10.1039/d2cp00670g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Manipulating excitons is of great significance to explore the optical properties of 2D materials. In this work, we investigate the excitonic properties and carrier dynamics of bilayer black phosphorene by imposing in-plane biaxial strain. The results show that the strain can modulate not only the contribution of the excitons to optical absorption but also the anisotropic shape of the first exciton. This can be ascribed to the strain effect on the band realignment as well as to changes of the parity and the electron effective mass at the CBM. At the temperature of 300 K, a 3% strain reduces the non-adiabatic coupling between the VBM and CBM and then increases the carrier lifetime by a factor of 13, and the results can be used to estimate the strain effect on the excitonic lifetime. Our results demonstrate that manipulation of the biaxial strain is a promising strategy to modulate the exciton properties of black phosphorene.
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Affiliation(s)
- Xiaolong Wang
- Key Laboratory of Material Modification by Laser, Ion and Electron Beams (Dalian University of Technology), Ministry of Education, Dalian 116024, China.
| | - Weiwei Gao
- Key Laboratory of Material Modification by Laser, Ion and Electron Beams (Dalian University of Technology), Ministry of Education, Dalian 116024, China.
| | - Jijun Zhao
- Key Laboratory of Material Modification by Laser, Ion and Electron Beams (Dalian University of Technology), Ministry of Education, Dalian 116024, China.
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Akimov AV. Excited state dynamics in monolayer black phosphorus revisited: Accounting for many-body effects. J Chem Phys 2021; 155:134106. [PMID: 34624981 DOI: 10.1063/5.0065606] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The dynamics of electron-hole recombination in pristine and defect-containing monolayer black phosphorus (ML-BP) has been studied computationally by several groups relying on the one-particle description of electronic excited states. Our recent developments enabled a more sophisticated and accurate treatment of excited states dynamics in systems with pronounced excitonic effects, including 2D materials such as ML-BP. In this work, I present a comprehensive characterization of optoelectronic properties and nonadiabatic dynamics of the ground state recovery in pristine and divacancy-containing ML-BP, relying on the linear-response time-dependent density functional theory description of excited states combined with several trajectory surface hopping methodologies and decoherence correction schemes. This work presents a revision and new implementation of the decoherence-induced surface hopping methodology. Several popular algorithms for nonadiabatic dynamics algorithms are assessed. The kinetics of nonradiative relaxation of lower-lying excited states in ML-BP systems is revised considering the new methodological developments. A general mechanism that explains the sensitivity of the nonradiative dynamics to the presence of divacancy defect in ML-BP is proposed. According to this mechanism, the excited states' relaxation may be inhibited by the presence of energetically close higher-energy states if electronic decoherence is present in the system.
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Affiliation(s)
- Alexey V Akimov
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, USA
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