1
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Akimov AV. Energy-Conserving and Thermally Corrected Neglect of Back-Reaction Approximation Method for Nonadiabatic Molecular Dynamics. J Phys Chem Lett 2023; 14:11673-11683. [PMID: 38109379 DOI: 10.1021/acs.jpclett.3c03029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2023]
Abstract
In this work, the energy-conserving and thermally corrected neglect of the back-reaction approximation approach for nonadiabatic molecular dynamics in extended atomistic systems is developed. The new approach introduces three key corrections to the original method: (1) it enforces the total energy conservation, (2) it introduces an explicit coupling of the system to its environment, and (3) it introduces a renormalization of nonadiabatic couplings to account for a difference between the instantaneous nuclear kinetic energy and the kinetic energy of guiding trajectories. In the new approach, an auxiliary kinetic energy variable is introduced as an independent dynamical variable. The new approach produces nonzero equilibrium populations, whereas the original neglect of the back-reaction approximation method does not. It yields population relaxation time scales that are favorably comparable to the reference values, and it introduces an explicit and controllable way of dissipating energy into a bath without an assumption of the bath being at equilibrium.
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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 United States
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2
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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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3
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Adjogri SJ, Meyer EL. Chalcogenide Perovskites and Perovskite-Based Chalcohalide as Photoabsorbers: A Study of Their Properties, and Potential Photovoltaic Applications. MATERIALS (BASEL, SWITZERLAND) 2021; 14:7857. [PMID: 34947450 PMCID: PMC8707488 DOI: 10.3390/ma14247857] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Revised: 09/04/2021] [Accepted: 09/08/2021] [Indexed: 12/03/2022]
Abstract
In 2015, a class of unconventional semiconductors, Chalcogenide perovskites, remained projected as possible solar cell materials. The MAPbI3 hybrid lead iodide perovskite has been considered the best so far, and due to its toxicity, the search for potential alternatives was important. As a result, chalcogenide perovskites and perovskite-based chalcohalide have recently been considered options and potential thin-film light absorbers for photovoltaic applications. For the synthesis of novel hybrid perovskites, dimensionality tailoring and compositional substitution methods have been used widely. The study focuses on the optoelectronic properties of chalcogenide perovskites and perovskite-based chalcohalide as possibilities for future photovoltaic applications.
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Affiliation(s)
- Shadrack J. Adjogri
- Fort Hare Institute of Technology, University of Fort Hare, Alice 5700, South Africa;
- Department of Chemistry, University of Fort Hare, Alice 5700, South Africa
| | - Edson L. Meyer
- Fort Hare Institute of Technology, University of Fort Hare, Alice 5700, South Africa;
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4
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She Y, Hou Z, Prezhdo OV, Li W. Identifying and Passivating Killer Defects in Pb-Free Double Cs 2AgBiBr 6 Perovskite. J Phys Chem Lett 2021; 12:10581-10588. [PMID: 34694808 DOI: 10.1021/acs.jpclett.1c03134] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Pb-free double perovskites, such as Cs2AgBiBr6, are alternatives to lead halide perovskites for photovoltaic applications due to superior stability, low toxicity, and promising optoelectronic properties. However, their performance is subpar. We combine nonadiabatic molecular dynamics and real-time time-dependent density-functional theory to show that the negatively charged Br vacancy in Cs2AgBiBr6 creates an extremely detrimental donor-yielded (DY) center, which is a typical defect in six-coordinated semiconductors. Ag+ and Bi3+ form a bond by attraction through the anisotropic vacancy charge, generating a midgap state that traps holes within tens of picoseconds. Substituting Ag with indium by doping produces a weak and long In-Bi bond, lifting the defect energy level to the conduction band. Hole trapping slows down by an order or magnitude, and trap-assisted charge recombination decreases 4-fold. The simulations bring atomistic insights into defects of Pb-free double perovskites and provide a defect mitigation strategy for rational design of high-performance optoelectronic devices.
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Affiliation(s)
- Yalan She
- School of Chemistry and Materials Science, Hunan Agricultural University, Changsha 410128, China
| | - Zhufeng Hou
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 350002 Fuzhou, China
| | - Oleg V Prezhdo
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States
| | - Wei Li
- School of Chemistry and Materials Science, Hunan Agricultural University, Changsha 410128, China
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5
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Zhong HX, Liu SM, Cen YL, Zhang M, Zhu YH, Du J, He Y, Guo WH, Wang XQ, Shi JJ. Layered Dion-Jacobson-Type Chalcogenide Perovskite CsLaM 2X 7 (M = Ta/Nb; X = S/Se) with a Narrow Band Gap of ∼1 eV as a Promising Rear Cell for All-Perovskite Tandem Solar Cells. ACS APPLIED MATERIALS & INTERFACES 2021; 13:48971-48980. [PMID: 34612640 DOI: 10.1021/acsami.1c10318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Perovskite-perovskite tandem solar cells have bright prospects to improve the power conversion efficiency (PCE) beyond the Shockley-Queisser (SQ) limit of single-junction solar cells. The star lead-based halide perovskites are well-recognized as suitable candidates for the front cell, thanks to their suitable band gap (∼1.8 eV), strong optical absorption, and high certified PCE. However, the toxicity of lead for the front cell and the lack of a narrow band gap (∼1.1 eV) for the rear cell seriously restrict the development of the two-junction tandem cell. To break through this bottleneck, a novel Dion-Jacobson (DJ)-type (n = 2) chalcogenide perovskite CsLaM2X7 (M = Ta, Nb; X = S, Se) has been found based on the powerful first-principles and advanced many-body perturbation GW calculations. Their excellent electronic, transport, and optical properties can be summarized as follows. (1) They are stable and environmentally friendly lead-free materials. (2) The direct band gap of CsLaTa2Se7 (0.96-1.10 eV) is much smaller than those of lead-based halide perovskites and very suitable for the rear cell in the two-junction tandem cell. (3) The carrier mobility in CsLaTa2Se7 reaches 1.6 × 103 cm2 V-1 s-1 at room temperature. (4) The absorption coefficients (3-5 × 105 cm-1) are 1 order higher than that of Si (104 cm-1). (5) The estimated PCEs of the Cs2Sb2Br8-CsLaTa2Se7 tandem cell (33.3%) and the concentrator solar cell (35.8% in 100 suns) are higher than those of the best recorded GaAs-Si tandem cell (32.8%) and the perovskite-perovskite tandem solar cell (24.8%). These energetic results strongly demonstrate that the novel lead-free chalcogenide perovskites CsLaM2X7 are good candidates for the rear cell of tandem cells.
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Affiliation(s)
- Hong-Xia Zhong
- School of Mathematics and Physics, China University of Geosciences, Wuhan 430074, China
- School of Physics and Technology, Wuhan University, Wuhan 430072, China
| | - Shi-Ming Liu
- State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China
| | - Yu-Lang Cen
- State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China
| | - Min Zhang
- Inner Mongolia Key Laboratory for Physics and Chemistry of Functional Materials, College of Physics and Electronic Information, Inner Mongolia Normal University, Hohhot 010022, China
| | - Yao-Hui Zhu
- Physics Department, Beijing Technology and Business University, Beijing 100048, China
| | - Juan Du
- State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China
| | - Yong He
- State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China
| | - Wen-Hui Guo
- State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China
| | - Xin-Qiang Wang
- State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China
| | - Jun-Jie Shi
- State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China
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6
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Ke X, Wang K, Tu C, Huang R, Luo D, Zhang M. Novel Aggregation-Induced Emission Materials/Cadmium Sulfide Composite Photocatalyst for Efficient Hydrogen Evolution in Absence of Sacrificial Reagent. MATERIALS 2020; 13:ma13225287. [PMID: 33266443 PMCID: PMC7700582 DOI: 10.3390/ma13225287] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 11/14/2020] [Accepted: 11/19/2020] [Indexed: 11/16/2022]
Abstract
This work focuses on the development of a novel organic–inorganic photoactive material composited by aggregation-induced emission luminogens (AIE) and CdS. Tetraphenylethene-based AIE (TPE-Ca) is synthesized on CdS to form CdS/TPE-Ca electrode, due to its suitable band structure and potential capability of renewable energy production. The CdS/TPE-Ca electrode presents over three-fold improved photocurrent density and dramatically reduced interfacial resistance, compared with the pure CdS electrode. In addition, the engineering of the band alignment allows the holes to accumulate on the valance band of TPE-Ca, which would partially prevent the CdS from photo-corrosion, thus improving the stability of the sacrificial-free electrolyte photoelectrochemical cell.
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Affiliation(s)
- Xi Ke
- Institute of Semiconductors, South China Normal University, Guangzhou 510631, China; (X.K.); (K.W.)
| | - Kunqiang Wang
- Institute of Semiconductors, South China Normal University, Guangzhou 510631, China; (X.K.); (K.W.)
| | - Chen Tu
- School of Chemistry, Faculty of Science, Chemistry Building F11, Camperdown 2050, University of Sydney, Camperdown, NSW 2006, Australia;
| | - Runda Huang
- School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China;
| | - Dongxiang Luo
- Institute of Semiconductors, South China Normal University, Guangzhou 510631, China; (X.K.); (K.W.)
- Correspondence: (D.L.); (M.Z.)
| | - Menglong Zhang
- Institute of Semiconductors, South China Normal University, Guangzhou 510631, China; (X.K.); (K.W.)
- Correspondence: (D.L.); (M.Z.)
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7
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Ghosh D, Neukirch AJ, Tretiak S. Optoelectronic Properties of Two-Dimensional Bromide Perovskites: Influences of Spacer Cations. J Phys Chem Lett 2020; 11:2955-2964. [PMID: 32208726 DOI: 10.1021/acs.jpclett.0c00594] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Two-dimensional (2D) halide perovskites have displayed unique emission properties, making them potential candidates for next-generation light-emitting devices. Here, we combine nonadiabatic molecular dynamics and time-domain density functional theory to investigate the fundamental mechanisms of carrier recombination processes. Considering monolayer bromide perovskites with dissimilar organic spacer molecules, n-butylammonium (BA) and phenylethylammonium (PEA) cations, we find a strong correlation between temperature-induced structural fluctuations and nonradiative carrier recombination rates in these materials. The more flexible geometry of (BA)2PbBr4 compared to that of (PEA)2PbBr4, results in faster electron-hole recombination and shorter carrier lifetime, diminishing the photoluminescence quantum yield for softer 2D perovskites. Reduced structural fluctuations in relatively rigid (PEA)2PbBr4 not only indicate of a longer carrier lifetime but also suggest a narrower emission line width, implying a higher purity of the emitted light. Our ab initio modeling of excited state properties in 2D perovskites conveys material designing strategies to fine-tune perovskite emissions for solid-state lighting applications.
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Affiliation(s)
- Dibyajyoti Ghosh
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
- Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Amanda J Neukirch
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Sergei Tretiak
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
- Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
- Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
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8
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Smith B, Akimov AV. Hot Electron Cooling in Silicon Nanoclusters via Landau-Zener Nonadiabatic Molecular Dynamics: Size Dependence and Role of Surface Termination. J Phys Chem Lett 2020; 11:1456-1465. [PMID: 31958367 DOI: 10.1021/acs.jpclett.9b03687] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We develop a new express methodology for modeling excited-state dynamics occurring in dense manifolds of electronic states in atomistic systems. The approach leverages a modified Landau-Zener formula, the neglect of a back-reaction approximation, and the highly efficient density functional tight-binding method. We study the hot electron dynamics in a series of H- and F-terminated silicon nanocrystals (NCs) containing up to several hundred atoms. We explain the slower electron cooling dynamics in F-terminated NCs by the larger energy gaps between the adjacent electronic states in these systems as well as their slower fluctuations. We conclude that both the mass and chemical identity of the surface termination groups equally influence the electron dynamics, on average. However, the mass effect becomes dominant for higher-energy excitations. We find that the electron decay dynamics in F-terminated NCs has a greater sensitivity to the mass of the surface ligands than do the H-terminated NCs and explain this observation by the details of the electron-phonon coupling in the systems. We find that in the H-terminated NCs, electronic transitions in the cooling process occur predominantly between the surface states, whereas in F-terminated Si NCs, both surface and NC core states are coupled to the nuclear vibrations. We find that electron energy relaxation is accelerated in larger NCs and attribute this effect to the higher densities of states and smaller energy gaps in these systems.
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Affiliation(s)
- Brendan Smith
- Department of Chemistry , University at Buffalo, The State University of New York , Buffalo , New York 14260 , United States
| | - Alexey V Akimov
- Department of Chemistry , University at Buffalo, The State University of New York , Buffalo , New York 14260 , United States
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9
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Smith B, Akimov AV. Modeling nonadiabatic dynamics in condensed matter materials: some recent advances and applications. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 32:073001. [PMID: 31661681 DOI: 10.1088/1361-648x/ab5246] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
This review focuses on recent developments in the field of nonadiabatic molecular dynamics (NA-MD), with particular attention given to condensed-matter systems. NA-MD simulations for small molecular systems can be performed using high-level electronic structure (ES) calculations, methods accounting for the quantization of nuclear motion, and using fewer approximations in the dynamical methodology itself. Modeling condensed-matter systems imposes many limitations on various aspects of NA-MD computations, requiring approximations at various levels of theory-from the ES, to the ways in which the coupling of electrons and nuclei are accounted for. Nonetheless, the approximate treatment of NA-MD in condensed-phase materials has gained a spin lately in many applied studies. A number of advancements of the methodology and computational tools have been undertaken, including general-purpose methods, as well as those tailored to nanoscale and condensed matter systems. This review summarizes such methodological and software developments, puts them into the broader context of existing approaches, and highlights some of the challenges that remain to be solved.
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Affiliation(s)
- Brendan Smith
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, United States of America
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10
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Scher JA, Govind N, Chakraborty A. Evidence of Skewness and Sub-Gaussian Character in Temperature-Dependent Distributions of One Million Electronic Excitation Energies in PbS Quantum Dots. J Phys Chem Lett 2020; 11:986-992. [PMID: 31927924 DOI: 10.1021/acs.jpclett.9b03103] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Obtaining statistical distributions by sampling a large number of conformations is vital for an accurate description of temperature-dependent properties of chemical systems. However, constructing distributions with 105-106 samples is computationally challenging because of the prohibitively high computational cost of performing first-principles quantum mechanical calculations. In this work, we present a new technique called the effective stochastic potential configuration interaction singles (ESP-CIS) method to obtain excitation energies. The ESP-CIS method uses random matrix theory for the construction of an effective stochastic representation of the Fock operator and combines it with the CIS method. Excited-state energies of PbS quantum dots (0.75-1.75 nm) at temperatures of 10-400 K were calculated using the ESP-CIS method. Results from a total of 27 million excitation energy calculations revealed the distributions to be sub-Gaussian in nature with negative skewness, which progressively became red-shifted with increasing temperature. This study demonstrates the efficacy of the ESP-CIS method as a general-purpose method for efficient excited-state calculations.
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Affiliation(s)
- Jeremy A Scher
- Department of Chemistry , Syracuse University , Syracuse , New York 13244 , United States
| | - Niranjan Govind
- Environmental Molecular Sciences Laboratory , Pacific Northwest National Laboratory , Richland , Washington 99352 , United States
| | - Arindam Chakraborty
- Department of Chemistry , Syracuse University , Syracuse , New York 13244 , United States
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11
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Yan H, Li Y, Li X, Wang B, Li M. Hot carrier relaxation in Cs2TiIyBr6−y (y = 0, 2 and 6) by a time-domain ab initio study. RSC Adv 2020; 10:958-964. [PMID: 35494478 PMCID: PMC9048232 DOI: 10.1039/c9ra06731k] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Accepted: 12/09/2019] [Indexed: 11/21/2022] Open
Abstract
Cs2TiIyBr6−y is a potential light absorption material for all-inorganic lead free perovskite solar cells due to its suitable and tunable bandgap, high optical absorption coefficient and high environmental stability. However, solar cells fabricated based on Cs2TiIyBr6−y do not perform well, and the reasons for their low efficiency are still unclear. Herein, hot carrier relaxation processes in Cs2TiIyBr6−y (y = 0, 2 and 6) were investigated by a time-domain density functional theory combined with the non-adiabatic molecular dynamics method. It was found that the relaxation time of the hot carriers in Cs2TiIyBr6−y ranges from 2–3 ps, which indicates that the hot carriers within 10 nm from the Cs2TiIyBr6−y/TiO2 interface can be effectively extracted before their energy is lost completely. The carrier-phonon non-adiabatic coupling (NAC) analyses demonstrate that the longer hot electron relaxation time in Cs2TiI2Br4 compared with that in Cs2TiBr6 and Cs2TiI6 originates from its weaker NAC strength. Furthermore, the electron–phonon interaction analyses indicate that the relaxation of hot electrons mainly comes from the coupling between the electrons distributed on the Ti–X bonds and the Ti–X vibrations, and that of hot holes can be attributed to the coupling between the electrons distributed on the X atoms and the distortions of [TiIyBr6−y]2−. The simulation results indicate that Cs2TiI2Br4 should be better than Cs2TiBr6 and Cs2TiI6 to act as a light absorption layer based on the hot carrier energy loss, and the hot electron relaxation time in Cs2TiIyBr6−y can be adjusted by tuning the proportion of the I element. The hot carriers within 10 nm from the Cs2TiIyBr6−y/TiO2 interface can be extracted effectively due to their 2–3 ps relaxation time.![]()
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Affiliation(s)
- Hejin Yan
- State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources
- North China Electric Power University
- Beijing
- China
| | - Yingfeng Li
- State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources
- North China Electric Power University
- Beijing
- China
| | - Xiang Li
- State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources
- North China Electric Power University
- Beijing
- China
| | - Bingxin Wang
- State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources
- North China Electric Power University
- Beijing
- China
| | - Meicheng Li
- State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources
- North China Electric Power University
- Beijing
- China
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12
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Ivanov MV, Jagau TC, Zhu GZ, Hudson ER, Krylov AI. In search of molecular ions for optical cycling: a difficult road. Phys Chem Chem Phys 2020; 22:17075-17090. [DOI: 10.1039/d0cp02921a] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Optical cycling, a continuous photon scattering off atoms or molecules, is the key tool in quantum information science.
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Affiliation(s)
- Maxim V. Ivanov
- Department of Chemistry
- University of Southern California
- Los Angeles
- USA
| | - Thomas-C. Jagau
- Department of Chemistry
- Katholieke Universiteit Leuven
- Leuven
- Belgium
| | - Guo-Zhu Zhu
- Department of Physics and Astronomy
- University of California Los Angeles
- Los Angeles
- USA
| | - Eric R. Hudson
- Department of Physics and Astronomy
- University of California Los Angeles
- Los Angeles
- USA
- UCLA Center for Quantum Science and Engineering
| | - Anna I. Krylov
- Department of Chemistry
- University of Southern California
- Los Angeles
- USA
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13
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Smith B, Akimov AV. A comparative analysis of surface hopping acceptance and decoherence algorithms within the neglect of back-reaction approximation. J Chem Phys 2019; 151:124107. [DOI: 10.1063/1.5122770] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Affiliation(s)
- Brendan Smith
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, USA
| | - 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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14
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Syzgantseva MA, Stepanov NF, Syzgantseva OA. Carrier Lifetimes and Recombination Pathways in Metal-Organic Frameworks. J Phys Chem Lett 2019; 10:5041-5046. [PMID: 31411032 DOI: 10.1021/acs.jpclett.9b02051] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Understanding the excited-state charge carrier relaxation in metal-organic frameworks (MOFs) and revealing ways to alternate its rate are of primary importance for the development of novel hybrid photoactive materials with sufficiently long carrier lifetimes; in particular, shedding light on the main recombination pathways in this class of compounds is needed. Therefore, in this work the radiative and phonon-assisted nonradiative electron-hole recombination is investigated theoretically for a model MOF system, and the nonradiative pathway is demonstrated to be dominant even for a pristine defect-free material. Theoretically predicted electron-hole lifetimes are in line with the available experimental data, suggesting that the adopted methodology is suitable for prediction of carrier lifetimes and helpful for the interpretation of experimental data. Based on the obtained conclusions, the principles for modification of MOF geometrical and chemical structure, enabling the extension of carrier lifetimes, are formulated.
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Affiliation(s)
- Maria A Syzgantseva
- Laboratory of Quantum Mechanics and Molecular Structure, Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
| | - Nikolay F Stepanov
- Laboratory of Quantum Mechanics and Molecular Structure, Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
| | - Olga A Syzgantseva
- Laboratory of Molecular Simulation (LSMO), Institut des Sciences et Ingénierie Chimiques, Valais, Ecole Polytechnique Fédérale de Lausanne (EPFL), Rue de l'Industrie 17, CH-1951 Sion, Switzerland
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15
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Peng Y, Sun Q, Chen H, Yin WJ. Disparity of the Nature of the Band Gap between Halide and Chalcogenide Single Perovskites for Solar Cell Absorbers. J Phys Chem Lett 2019; 10:4566-4570. [PMID: 31340644 DOI: 10.1021/acs.jpclett.9b01657] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Chalcogenide perovskites ABX3 (A = Ca, Sr, or Ba; B = Ti, Zr, or Hf; and X = O, S, or Se) have been considered as promising candidates for overcoming the stability and toxic issues of halide perovskites. In this work, we unveil the disparity of the nature of the band gap between halide and chalcogenide perovskites. First-principles calculations show that the prototype cubic phase of chalcogenide perovskites exhibits indirect band gaps with the valence band maximum and the conduction band minimum located at R and Γ points, respectively, in the Brillion zone. Therefore, the optical transitions near band edges of chalcogenide perovskites differ from those of its halide counterparts, although its stable orthorhombic phase embodies a direct band gap. We have further found that the direct-indirect band gap difference of chalcogenide perovskites in the cubic phase demonstrates a linear correlation with t + μ, where t and μ are the tolerance and octahedral factor, respectively, thereby providing a viable way to search chalcogenide perovskites with a quasi-direct band gap.
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Affiliation(s)
- Yujie Peng
- College of Energy, Soochow Institute for Energy and Materials Innovations (SIEMIS) , Soochow University , Suzhou 215006 , China
- Jiangsu Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies , Soochow University , Suzhou 215006 , China
- Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province and Key Lab of Modern Optical Technologies of Education Ministry of China , Soochow University , Suzhou 215006 , China
| | - Qingde Sun
- College of Energy, Soochow Institute for Energy and Materials Innovations (SIEMIS) , Soochow University , Suzhou 215006 , China
- Jiangsu Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies , Soochow University , Suzhou 215006 , China
| | - Hangyan Chen
- School of Physical Science and Technology , Soochow University , Suzhou 215006 , China
| | - Wan-Jian Yin
- College of Energy, Soochow Institute for Energy and Materials Innovations (SIEMIS) , Soochow University , Suzhou 215006 , China
- Jiangsu Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies , Soochow University , Suzhou 215006 , China
- Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province and Key Lab of Modern Optical Technologies of Education Ministry of China , Soochow University , Suzhou 215006 , China
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16
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Ivanov MV, Bangerter FH, Krylov AI. Towards a rational design of laser-coolable molecules: insights from equation-of-motion coupled-cluster calculations. Phys Chem Chem Phys 2019; 21:19447-19457. [DOI: 10.1039/c9cp03914g] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Access to cold molecules is critical for quantum information science, design of new sensors, ultracold chemistry, and search of new phenomena.
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Affiliation(s)
- Maxim V. Ivanov
- Department of Chemistry
- University of Southern California
- Los Angeles
- USA
| | - Felix H. Bangerter
- Department of Chemistry
- University of Southern California
- Los Angeles
- USA
- Ludwig Maximilian University Munich
| | - Anna I. Krylov
- Department of Chemistry
- University of Southern California
- Los Angeles
- USA
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17
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Akimov AV. A Simple Phase Correction Makes a Big Difference in Nonadiabatic Molecular Dynamics. J Phys Chem Lett 2018; 9:6096-6102. [PMID: 30286602 DOI: 10.1021/acs.jpclett.8b02826] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
The outcomes of nonadiabatic molecular dynamics (NA-MD) calculations are modulated by the parameters entering the time-dependent Schrödinger equation (TD-SE). The adiabatic states are commonly used as the basis in which the TD-SE is integrated. However, the phase inconsistencies of such states along the nuclear trajectories obtained in NA-MD simulations may render the wave function and other relevant properties ill-behaving, adversely affecting the dynamics. This work illustrates the consequence of adiabatic state phase inconsistencies in nonadiabatic Ehrenfest dynamics. A simple phase-correction approach is proposed and is demonstrated to alter the dynamics to make it consistent with the reference calculations done in the phase-consistent diabatic representation.
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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 , United States
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18
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Ivanov MV, Reid SA, Rathore R. Game of Frontier Orbitals: A View on the Rational Design of Novel Charge-Transfer Materials. J Phys Chem Lett 2018; 9:3978-3986. [PMID: 29952570 DOI: 10.1021/acs.jpclett.8b01093] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Since the first application of frontier molecular orbitals (FMOs) to rationalize stereospecificity of pericyclic reactions, FMOs have remained at the forefront of chemical theory. Yet, the practical application of FMOs in the rational design and synthesis of novel charge transfer materials remains under-appreciated. In this Perspective, we demonstrate that molecular orbital theory is a powerful and universal tool capable of rationalizing the observed redox/optoelectronic properties of various aromatic hydrocarbons in the context of their application as charge-transfer materials. Importantly, the inspection of FMOs can provide instantaneous insight into the interchromophoric electronic coupling and polaron delocalization in polychromophoric assemblies, and therefore is invaluable for the rational design and synthesis of novel materials with tailored properties.
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Affiliation(s)
- Maxim V Ivanov
- Department of Chemistry , Marquette University , P.O. Box 1881, Milwaukee , Wisconsin 53201-1881 , United States
| | - Scott A Reid
- Department of Chemistry , Marquette University , P.O. Box 1881, Milwaukee , Wisconsin 53201-1881 , United States
| | - Rajendra Rathore
- Department of Chemistry , Marquette University , P.O. Box 1881, Milwaukee , Wisconsin 53201-1881 , United States
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19
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Sato K, Pradhan E, Asahi R, Akimov AV. Charge transfer dynamics at the boron subphthalocyanine chloride/C60 interface: non-adiabatic dynamics study with Libra-X. Phys Chem Chem Phys 2018; 20:25275-25294. [DOI: 10.1039/c8cp03841d] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The Libra-X software for non-adiabatic molecular dynamics is reported. It is used to comprehensively study the charge transfer dynamics at the boron subphtalocyanine chloride (SubPc)/fullerene (C60) interface.
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Affiliation(s)
- Kosuke Sato
- Toyota Central Research and Development Laboratories, Inc
- Nagakute
- Japan
| | - Ekadashi Pradhan
- Department of Chemistry
- University at Buffalo
- The State University of New York
- New York 14260-3000
- USA
| | - Ryoji Asahi
- Toyota Central Research and Development Laboratories, Inc
- Nagakute
- Japan
| | - Alexey V. Akimov
- Department of Chemistry
- University at Buffalo
- The State University of New York
- New York 14260-3000
- USA
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