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Zhang X, Kang J, Wei SH. Defect modeling and control in structurally and compositionally complex materials. NATURE COMPUTATIONAL SCIENCE 2023; 3:210-220. [PMID: 38177885 DOI: 10.1038/s43588-023-00403-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Accepted: 01/16/2023] [Indexed: 01/06/2024]
Abstract
Conventional computational approaches for modeling defects face difficulties when applied to complex materials, mainly due to the vast configurational space of defects. In this Perspective, we discuss the challenges in calculating defect properties in complex materials, review recent advances in computational techniques and showcase new mechanistic insights developed from these methods. We further discuss the remaining challenges in improving the accuracy and efficiency of defect modeling in complex materials, and provide an outlook on potential research directions.
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Affiliation(s)
- Xie Zhang
- Beijing Computational Science Research Center, Beijing, China
| | - Jun Kang
- Beijing Computational Science Research Center, Beijing, China
| | - Su-Huai Wei
- Beijing Computational Science Research Center, Beijing, China.
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2
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Kopač Lautar A, Hagopian A, Filhol JS. Modeling interfacial electrochemistry: concepts and tools. Phys Chem Chem Phys 2020; 22:10569-10580. [DOI: 10.1039/c9cp06684e] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
This paper presents a grand canonical formalism and provides tools to investigate electrochemical effects at interfaces.
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Affiliation(s)
- Anja Kopač Lautar
- Department of Materials Chemistry
- National Institute of Chemistry
- Slovenia
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3
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Berche A, Jund P. Thermoelectric power factor of pure and doped ZnSb via DFT based defect calculations. Phys Chem Chem Phys 2019; 21:23056-23064. [PMID: 31599887 DOI: 10.1039/c9cp04397g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The power factor of pure p-type ZnSb has been calculated via ab initio simulations assuming that the carrier concentrations are due to the doping effect of intrinsic zinc vacancies. With a vacancy concentration close to the experimental solubility limit we were able to perfectly reproduce the Power Factor measured in polycrystalline ZnSb samples. The methodology has then been successfully extended for predicting the effect of extrinsic doping elements on the thermoelectric properties of ZnSb. Germanium and tin seem to be promising p-type doping elements. In addition, we give, for the first time, an explanation of why it is difficult to synthesize polycrystalline n-type ZnSb samples. Indeed, compensative effects between intrinsic defects (zinc vacancies) and doping elements (Ga, or In) explain the existence of an optimal (and relatively high) dopant concentration necessary to convert ZnSb into an n-type semiconductor.
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Affiliation(s)
- Alexandre Berche
- ICGM-Université de Montpellier, CNRS, ENSCM, UMR, 5253, Montpellier, France.
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4
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Bocchini A, Neufeld S, Gerstmann U, Schmidt WG. Oxygen and potassium vacancies in KTP calculated from first principles. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:385401. [PMID: 31189148 DOI: 10.1088/1361-648x/ab295c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The atomic geometry and energetics of oxygen and potassium vacancies in potassium titanyl phosphate (KTP) as well as their electronic and optical properties are studied within density-functional theory in dependence of their charge state. Oxygen vacancies formed between Ti and P are characterized by a negative-U behavior. Their neutral charge state is favored for Fermi levels near the conduction band and gives rise to a defect level in the band gap, which leads to an additional optical absorption peak. In contrast, the two-fold positive charge state, stable for low and intermediate values of the Fermi level, modifies the KTP optical response only slightly. Oxygen vacancies formed between two Ti atoms are two-fold positively charged, while potassium vacancies are negatively charged irrespective of the Fermi level position. In both these cases, the KTP optical response is essentially not affected.
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Affiliation(s)
- A Bocchini
- Lehrstuhl für Theoretische Materialphysik, Universität Paderborn, Paderborn 330095, Germany
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5
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Xu S, Carter EA. Theoretical Insights into Heterogeneous (Photo)electrochemical CO2 Reduction. Chem Rev 2018; 119:6631-6669. [DOI: 10.1021/acs.chemrev.8b00481] [Citation(s) in RCA: 279] [Impact Index Per Article: 46.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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6
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Zhang H, Fu Z, Zhang R, Zhang Q, Tian H, Legut D, Germann TC, Guo Y, Du S, Francisco JS. Designing flexible 2D transition metal carbides with strain-controllable lithium storage. Proc Natl Acad Sci U S A 2017; 114:E11082-E11091. [PMID: 29229853 PMCID: PMC5748225 DOI: 10.1073/pnas.1717219115] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Efficient flexible energy storage systems have received tremendous attention due to their enormous potential applications in self-powering portable electronic devices, including roll-up displays, electronic paper, and "smart" garments outfitted with piezoelectric patches to harvest energy from body movement. Unfortunately, the further development of these technologies faces great challenges due to a lack of ideal electrode materials with the right electrochemical behavior and mechanical properties. MXenes, which exhibit outstanding mechanical properties, hydrophilic surfaces, and high conductivities, have been identified as promising electrode material candidates. In this work, taking 2D transition metal carbides (TMCs) as representatives, we systematically explored several influencing factors, including transition metal species, layer thickness, functional group, and strain on their mechanical properties (e.g., stiffness, flexibility, and strength) and their electrochemical properties (e.g., ionic mobility, equilibrium voltage, and theoretical capacity). Considering potential charge-transfer polarization, we employed a charged electrode model to simulate ionic mobility and found that ionic mobility has a unique dependence on the surface atomic configuration influenced by bond length, valence electron number, functional groups, and strain. Under multiaxial loadings, electrical conductivity, high ionic mobility, low equilibrium voltage with good stability, excellent flexibility, and high theoretical capacity indicate that the bare 2D TMCs have potential to be ideal flexible anode materials, whereas the surface functionalization degrades the transport mobility and increases the equilibrium voltage due to bonding between the nonmetals and Li. These results provide valuable insights for experimental explorations of flexible anode candidates based on 2D TMCs.
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Affiliation(s)
- Hang Zhang
- School of Materials Science and Engineering, Beihang University, Beijing 100191, People's Republic of China
- Center for Integrated Computational Materials Engineering, International Research Institute for Multidisciplinary Science, Beihang University, Beijing 100191, People's Republic of China
| | - Zhongheng Fu
- School of Materials Science and Engineering, Beihang University, Beijing 100191, People's Republic of China
- Center for Integrated Computational Materials Engineering, International Research Institute for Multidisciplinary Science, Beihang University, Beijing 100191, People's Republic of China
| | - Ruifeng Zhang
- School of Materials Science and Engineering, Beihang University, Beijing 100191, People's Republic of China;
- Center for Integrated Computational Materials Engineering, International Research Institute for Multidisciplinary Science, Beihang University, Beijing 100191, People's Republic of China
| | - Qianfan Zhang
- School of Materials Science and Engineering, Beihang University, Beijing 100191, People's Republic of China
- Center for Integrated Computational Materials Engineering, International Research Institute for Multidisciplinary Science, Beihang University, Beijing 100191, People's Republic of China
| | - Hongzhen Tian
- School of Materials Science and Engineering, Beihang University, Beijing 100191, People's Republic of China
- Center for Integrated Computational Materials Engineering, International Research Institute for Multidisciplinary Science, Beihang University, Beijing 100191, People's Republic of China
| | - Dominik Legut
- IT4Innovations Center, VŠB -Technical University of Ostrava, CZ-70833 Ostrava, Czech Republic
| | - Timothy C Germann
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545
| | - Yuanqi Guo
- School of Materials Science and Engineering, Beihang University, Beijing 100191, People's Republic of China
- Center for Integrated Computational Materials Engineering, International Research Institute for Multidisciplinary Science, Beihang University, Beijing 100191, People's Republic of China
| | - Shiyu Du
- Engineering Laboratory of Specialty Fibers and Nuclear Energy Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, China
| | - Joseph S Francisco
- Department of Chemistry, Purdue University, West Lafayette, IN 47906;
- College of Arts and Sciences, University of Nebraska-Lincoln, Lincoln, NE 68588
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7
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Pandey M, Rasmussen FA, Kuhar K, Olsen T, Jacobsen KW, Thygesen KS. Defect-Tolerant Monolayer Transition Metal Dichalcogenides. NANO LETTERS 2016; 16:2234-2239. [PMID: 27027786 DOI: 10.1021/acs.nanolett.5b04513] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Localized electronic states formed inside the band gap of a semiconductor due to crystal defects can be detrimental to the material's optoelectronic properties. Semiconductors with a lower tendency to form defect induced deep gap states are termed defect-tolerant. Here we provide a systematic first-principles investigation of defect tolerance in 29 monolayer transition metal dichalcogenides (TMDs) of interest for nanoscale optoelectronics. We find that the TMDs based on group VI and X metals form deep gap states upon creation of a chalcogen (S, Se, Te) vacancy, while the TMDs based on group IV metals form only shallow defect levels and are thus predicted to be defect-tolerant. Interestingly, all the defect sensitive TMDs have valence and conduction bands with a very similar orbital composition. This indicates a bonding/antibonding nature of the gap, which in turn suggests that dangling bonds will fall inside the gap. These ideas are made quantitative by introducing a descriptor that measures the degree of similarity of the conduction and valence band manifolds. Finally, the study is generalized to nonpolar nanoribbons of the TMDs where we find that only the defect sensitive materials form edge states within the band gap.
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Affiliation(s)
- Mohnish Pandey
- Center for Atomic-Scale Materials Design (CAMD), Department of Physics, Technical University of Denmark , DK-2800 Kongens Lyngby, Denmark
| | - Filip A Rasmussen
- Center for Atomic-Scale Materials Design (CAMD), Department of Physics, Technical University of Denmark , DK-2800 Kongens Lyngby, Denmark
| | - Korina Kuhar
- Center for Atomic-Scale Materials Design (CAMD), Department of Physics, Technical University of Denmark , DK-2800 Kongens Lyngby, Denmark
| | - Thomas Olsen
- Center for Atomic-Scale Materials Design (CAMD), Department of Physics, Technical University of Denmark , DK-2800 Kongens Lyngby, Denmark
| | - Karsten W Jacobsen
- Center for Atomic-Scale Materials Design (CAMD), Department of Physics, Technical University of Denmark , DK-2800 Kongens Lyngby, Denmark
| | - Kristian S Thygesen
- Center for Atomic-Scale Materials Design (CAMD), Department of Physics, Technical University of Denmark , DK-2800 Kongens Lyngby, Denmark
- Center for Nanostructured Graphene (CNG), Department of Physics, Technical University of Denmark , DK-2800 Kongens Lyngby, Denmark
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8
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Liu X, Cheng J, Sprik M. Aqueous Transition-Metal Cations as Impurities in a Wide Gap Oxide: The Cu2+/Cu+ and Ag2+/Ag+ Redox Couples Revisited. J Phys Chem B 2014; 119:1152-63. [DOI: 10.1021/jp506691h] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Xiandong Liu
- Department
of Chemistry, University of Cambridge, Cambridge CB2 1EW, United Kingdom
- State Key Laboratory
for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
| | - Jun Cheng
- Department
of Chemistry, University of Cambridge, Cambridge CB2 1EW, United Kingdom
- Department
of Chemistry, University of Aberdeen, Aberdeen AB24 3UE, United Kingdom
| | - Michiel Sprik
- Department
of Chemistry, University of Cambridge, Cambridge CB2 1EW, United Kingdom
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9
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Li Y, Sanna S, Schmidt WG. Modeling intrinsic defects in LiNbO3 within the Slater-Janak transition state model. J Chem Phys 2014; 140:234113. [DOI: 10.1063/1.4883737] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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10
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Bendavid LI, Carter EA. Status in Calculating Electronic Excited States in Transition Metal Oxides from First Principles. Top Curr Chem (Cham) 2014; 347:47-98. [DOI: 10.1007/128_2013_503] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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11
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Van Ginhoven RM, Schultz PA. Off-center Tl and Na dopant centers in CsI. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2013; 25:495504. [PMID: 24196783 DOI: 10.1088/0953-8984/25/49/495504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We use density functional theory calculations to characterize the electronic and structural properties of the Tl and Na dopant centers in CsI. We find that the Tl and Na centers can accept one or two electrons and couple to long-range relaxations in the surrounding crystal lattice to distort strongly off-center to multiple distinct minima, even without a triplet excitation. The long-range distortions are a mechanism to couple to phonon modes in the crystal, and are expected to play an important role in the phonon-assisted transport of polarons in activated CsI and subsequent light emission in this scintillator.
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12
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Comas-Vives A, Bandlow J, Jacob T. Ab initio study of the electrochemical H2SO4/Pt(111) interface. Phys Chem Chem Phys 2013; 15:992-7. [DOI: 10.1039/c2cp43054a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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Liao P, Carter EA. New concepts and modeling strategies to design and evaluate photo-electro-catalysts based on transition metal oxides. Chem Soc Rev 2013; 42:2401-22. [DOI: 10.1039/c2cs35267b] [Citation(s) in RCA: 204] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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14
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Hine NDM, Dziedzic J, Haynes PD, Skylaris CK. Electrostatic interactions in finite systems treated with periodic boundary conditions: application to linear-scaling density functional theory. J Chem Phys 2012; 135:204103. [PMID: 22128924 DOI: 10.1063/1.3662863] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We present a comparison of methods for treating the electrostatic interactions of finite, isolated systems within periodic boundary conditions (PBCs), within density functional theory (DFT), with particular emphasis on linear-scaling (LS) DFT. Often, PBCs are not physically realistic but are an unavoidable consequence of the choice of basis set and the efficacy of using Fourier transforms to compute the Hartree potential. In such cases the effects of PBCs on the calculations need to be avoided, so that the results obtained represent the open rather than the periodic boundary. The very large systems encountered in LS-DFT make the demands of the supercell approximation for isolated systems more difficult to manage, and we show cases where the open boundary (infinite cell) result cannot be obtained from extrapolation of calculations from periodic cells of increasing size. We discuss, implement, and test three very different approaches for overcoming or circumventing the effects of PBCs: truncation of the Coulomb interaction combined with padding of the simulation cell, approaches based on the minimum image convention, and the explicit use of open boundary conditions (OBCs). We have implemented these approaches in the ONETEP LS-DFT program and applied them to a range of systems, including a polar nanorod and a protein. We compare their accuracy, complexity, and rate of convergence with simulation cell size. We demonstrate that corrective approaches within PBCs can achieve the OBC result more efficiently and accurately than pure OBC approaches.
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Affiliation(s)
- Nicholas D M Hine
- Department of Physics, Imperial College London, Exhibition Road, London SW7 2AZ, United Kingdom.
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15
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Costanzo F, Sulpizi M, Valle RGD, Sprik M. The oxidation of tyrosine and tryptophan studied by a molecular dynamics normal hydrogen electrode. J Chem Phys 2011; 134:244508. [DOI: 10.1063/1.3597603] [Citation(s) in RCA: 99] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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16
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Oba F, Choi M, Togo A, Tanaka I. Point defects in ZnO: an approach from first principles. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2011; 12:034302. [PMID: 27877390 PMCID: PMC5090462 DOI: 10.1088/1468-6996/12/3/034302] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2011] [Revised: 05/27/2011] [Accepted: 03/16/2011] [Indexed: 05/03/2023]
Abstract
Recent first-principles studies of point defects in ZnO are reviewed with a focus on native defects. Key properties of defects, such as formation energies, donor and acceptor levels, optical transition energies, migration energies and atomic and electronic structure, have been evaluated using various approaches including the local density approximation (LDA) and generalized gradient approximation (GGA) to DFT, LDA+U/GGA+U, hybrid Hartree-Fock density functionals, sX and GW approximation. Results significantly depend on the approximation to exchange correlation, the simulation models for defects and the post-processes to correct shortcomings of the approximation and models. The choice of a proper approach is, therefore, crucial for reliable theoretical predictions. First-principles studies have provided an insight into the energetics and atomic and electronic structures of native point defects and impurities and defect-induced properties of ZnO. Native defects that are relevant to the n-type conductivity and the non-stoichiometry toward the O-deficient side in reduced ZnO have been debated. It is suggested that the O vacancy is responsible for the non-stoichiometry because of its low formation energy under O-poor chemical potential conditions. However, the O vacancy is a very deep donor and cannot be a major source of carrier electrons. The Zn interstitial and anti-site are shallow donors, but these defects are unlikely to form at a high concentration in n-type ZnO under thermal equilibrium. Therefore, the n-type conductivity is attributed to other sources such as residual impurities including H impurities with several atomic configurations, a metastable shallow donor state of the O vacancy, and defect complexes involving the Zn interstitial. Among the native acceptor-type defects, the Zn vacancy is dominant. It is a deep acceptor and cannot produce a high concentration of holes. The O interstitial and anti-site are high in formation energy and/or are electrically inactive and, hence, are unlikely to play essential roles in electrical properties. Overall defect energetics suggests a preference for the native donor-type defects over acceptor-type defects in ZnO. The O vacancy, Zn interstitial and Zn anti-site have very low formation energies when the Fermi level is low. Therefore, these defects are expected to be sources of a strong hole compensation in p-type ZnO. For the n-type doping, the compensation of carrier electrons by the native acceptor-type defects can be mostly suppressed when O-poor chemical potential conditions, i.e. low O partial pressure conditions, are chosen during crystal growth and/or doping.
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Affiliation(s)
- Fumiyasu Oba
- Department of Materials Science and Engineering, Kyoto University, Sakyo, Kyoto 606-8501, Japan
| | - Minseok Choi
- Department of Materials Science and Engineering, Kyoto University, Sakyo, Kyoto 606-8501, Japan
| | - Atsushi Togo
- Department of Materials Science and Engineering, Kyoto University, Sakyo, Kyoto 606-8501, Japan
| | - Isao Tanaka
- Department of Materials Science and Engineering, Kyoto University, Sakyo, Kyoto 606-8501, Japan
- Nanostructures Research Laboratory, Japan Fine Ceramics Center, Atsuta, Nagoya 456-8587, Japan
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17
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Edwards AH, Taylor PC, Campbell KA, Pineda AC. First-principles study of (75)As NQR in arsenic-chalcogenide compounds. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2011; 23:055502. [PMID: 21406910 DOI: 10.1088/0953-8984/23/5/055502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We present a theoretical study of the nuclear quadrupole interaction, ν(Q), of (75)As in crystalline and amorphous materials containing sulfur and selenium, and compare them with experiment. We studied a combination of hydrogen-terminated molecular clusters and periodic cells at various levels of quantum chemical theory. The results show clearly that the standard density functional theory (DFT) approximations, LDA and GGA, underestimate the nuclear quadrupole (NQR) interaction systematically, while Hartree-Fock theory overestimates it to an even greater degree. However, various levels of configuration interaction and the B3LYP hybrid exchange-correlation functional, which includes some exact exchange, give very good quantitative agreement for As bonded only to the chalcogen species. As-As bonds require highly converged basis sets. We have performed a systematic study of the effect of local distortions around an arsenic atom on ν(Q) and η. Using a simple, semiclassical model, we have combined our total energy results with our NQR calculations to predict ν(Q) lineshapes for bond angle and bond length distortions. Our predictions for lineshape, including first and second moments, are in excellent agreement with the results of Su et al for a-As(2)S(3), a-As(2)Se(3) and a-AsSe. We offer new insight into the distortions that led to this inhomogeneous broadening. Our results show clearly that, for trivalent arsenic atoms with zero or one arsenic nearest neighbor, symmetric bond stretching is the predominant contributor to the ν(Q) linewidth. However, in the presence of two arsenic nearest neighbors, distortions of the As-As-As apex angle dominates and, in fact, leads to a much larger second moment, in agreement with experiment.
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Affiliation(s)
- Arthur H Edwards
- Air Force Research Laboratory, AFRL/RVSE, Kirtland AFB, NM 87117-5776, USA
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18
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Rurali R, Cartoix X. Theory of defects in one-dimensional systems: application to Al-catalyzed Si nanowires. NANO LETTERS 2009; 9:975-979. [PMID: 19206213 DOI: 10.1021/nl802847p] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The energetic cost of creating a defect within a host material is given by the formation energy. Here we present a formulation allowing the calculation of formation energies in one-dimensional nanostructures which overcomes the difficulties involved in applying the bulk formalism and the possible passivation of the surface. We also develop a formula for the Madelung correction for general dielectric tensors. We apply this formalism to the technologically important case of Al-nanoparticle-catalyzed Si nanowires, obtaining Al concentrations significantly larger than in their bulk counterparts and predicting the fast consumption of the nanoparticles when the wires are grown on n-type substrates.
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Affiliation(s)
- Riccardo Rurali
- Departament d'Enginyeria Electronica, Universitat Autnoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
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19
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Freysoldt C, Neugebauer J, Van de Walle CG. Fully ab initio finite-size corrections for charged-defect supercell calculations. PHYSICAL REVIEW LETTERS 2009; 102:016402. [PMID: 19257218 DOI: 10.1103/physrevlett.102.016402] [Citation(s) in RCA: 210] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2008] [Indexed: 05/20/2023]
Abstract
In ab initio theory, defects are routinely modeled by supercells with periodic boundary conditions. Unfortunately, the supercell approximation introduces artificial interactions between charged defects. Despite numerous attempts, a general scheme to correct for these is not yet available. We propose a new and computationally efficient method that overcomes limitations of previous schemes and is based on a rigorous analysis of electrostatics in dielectric media. Its reliability and rapid convergence with respect to cell size is demonstrated for charged vacancies in diamond and GaAs.
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Affiliation(s)
- Christoph Freysoldt
- Max-Planck-Institut für Eisenforschung, Max-Planck-Strasse 1, 40227 Düsseldorf, Germany
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20
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Ayala R, Sprik M. A Classical Point Charge Model Study of System Size Dependence of Oxidation and Reorganization Free Energies in Aqueous Solution. J Phys Chem B 2007; 112:257-69. [DOI: 10.1021/jp0748516] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Regla Ayala
- Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, United Kingdom
| | - Michiel Sprik
- Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, United Kingdom
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21
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Leung K, Marsman M. Energies of ions in water and nanopores within density functional theory. J Chem Phys 2007; 127:154722. [DOI: 10.1063/1.2772244] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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22
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Schultz PA. Theory of defect levels and the "band gap problem" in silicon. PHYSICAL REVIEW LETTERS 2006; 96:246401. [PMID: 16907259 DOI: 10.1103/physrevlett.96.246401] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2005] [Indexed: 05/11/2023]
Abstract
Quantitative predictions of defect properties in semiconductors using density functional theory have been crippled by two issues: the supercell approximation, which has incorrect boundary conditions for an isolated defect, and approximate functionals, that drastically underestimate the band gap. I describe modifications to the supercell method that incorporate boundary conditions appropriate to point defects, identify a common electron reservoir for net charge for all defects, deal with defect banding, and incorporate bulk polarization. The computed level spectrum for an extended set of silicon defects spans the experimental gap, i.e., exhibits no band gap problem, and agrees remarkably well with experiment.
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Affiliation(s)
- Peter A Schultz
- Multiscale Computational Materials Methods, Sandia National Laboratories, Albuquerque, New Mexico 87185-1110, USA.
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23
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Stack AG, Rustad JR, DeYoreo JJ, Land TA, Casey WH. The Growth Morphology of the {100} Surface of KDP (Archerite) on the Molecular Scale. J Phys Chem B 2004. [DOI: 10.1021/jp0473319] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- A. G. Stack
- Chemistry Graduate Group, Department of Land, Air, and Water Resources, University of California, Davis, California 95616, Department of Geology, University of California, Davis, California 95616, and Department of Chemistry and Materials Science, Lawrence Livermore National Laboratory, Livermore, California 94550
| | - J. R. Rustad
- Chemistry Graduate Group, Department of Land, Air, and Water Resources, University of California, Davis, California 95616, Department of Geology, University of California, Davis, California 95616, and Department of Chemistry and Materials Science, Lawrence Livermore National Laboratory, Livermore, California 94550
| | - J. J. DeYoreo
- Chemistry Graduate Group, Department of Land, Air, and Water Resources, University of California, Davis, California 95616, Department of Geology, University of California, Davis, California 95616, and Department of Chemistry and Materials Science, Lawrence Livermore National Laboratory, Livermore, California 94550
| | - T. A. Land
- Chemistry Graduate Group, Department of Land, Air, and Water Resources, University of California, Davis, California 95616, Department of Geology, University of California, Davis, California 95616, and Department of Chemistry and Materials Science, Lawrence Livermore National Laboratory, Livermore, California 94550
| | - W. H. Casey
- Chemistry Graduate Group, Department of Land, Air, and Water Resources, University of California, Davis, California 95616, Department of Geology, University of California, Davis, California 95616, and Department of Chemistry and Materials Science, Lawrence Livermore National Laboratory, Livermore, California 94550
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Lozovoi AY, Alavi A, Kohanoff J, Lynden-Bell RM. Ab initio simulation of charged slabs at constant chemical potential. J Chem Phys 2001. [DOI: 10.1063/1.1379327] [Citation(s) in RCA: 171] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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