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Kim C, Pham TL, Lee JS, Kim YI. Synthesis, thermal analysis, and band gap of ordered and disordered complex rock salt Li3TaO4. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Azizi A, Dogan M, Cain JD, Eskandari R, Yu X, Glazer EC, Cohen ML, Zettl A. Frustration and Atomic Ordering in a Monolayer Semiconductor Alloy. PHYSICAL REVIEW LETTERS 2020; 124:096101. [PMID: 32202855 DOI: 10.1103/physrevlett.124.096101] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Accepted: 02/03/2020] [Indexed: 06/10/2023]
Abstract
Frustrated interactions can lead to short-range ordering arising from incompatible interactions of fundamental physical quantities with the underlying lattice. The simplest example is the triangular lattice of spins with antiferromagnetic interactions, where the nearest-neighbor spin-spin interactions cannot simultaneously be energy minimized. Here we show that engineering frustrated interactions is a possible route for controlling structural and electronic phenomena in semiconductor alloys. Using aberration-corrected scanning transmission electron microscopy in conjunction with density functional theory calculations, we demonstrate atomic ordering in a two-dimensional semiconductor alloy as a result of the competition between geometrical constraints and nearest-neighbor interactions. Statistical analyses uncover the presence of short-range ordering in the lattice. In addition, we show how the induced ordering can be used as another degree of freedom to considerably modify the band gap of monolayer semiconductor alloys.
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Affiliation(s)
- Amin Azizi
- Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA
- Kavli Energy NanoScience Institute at the University of California, Berkeley, Berkeley, California 94720, USA
| | - Mehmet Dogan
- Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Jeffrey D Cain
- Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA
- Kavli Energy NanoScience Institute at the University of California, Berkeley, Berkeley, California 94720, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Rahmatollah Eskandari
- Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA
| | - Xuanze Yu
- Department of Materials Science and Engineering, University of California at Berkeley, Berkeley, California 94720, USA
| | - Emily C Glazer
- Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA
| | - Marvin L Cohen
- Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Alex Zettl
- Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA
- Kavli Energy NanoScience Institute at the University of California, Berkeley, Berkeley, California 94720, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
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Pan J, Cordell J, Tucker GJ, Tamboli AC, Zakutayev A, Lany S. Interplay between Composition, Electronic Structure, Disorder, and Doping due to Dual Sublattice Mixing in Nonequilibrium Synthesis of ZnSnN 2 :O. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1807406. [PMID: 30672031 DOI: 10.1002/adma.201807406] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2018] [Revised: 12/19/2018] [Indexed: 06/09/2023]
Abstract
The opportunity for enhanced functional properties in semiconductor solid solutions has attracted vast scientific interest for a variety of novel applications. However, the functional versatility originating from the additional degrees of freedom due to atomic composition and ordering comes along with new challenges in characterization and modeling. Developing predictive synthesis-structure-property relationships is prerequisite for effective materials design strategies. Here, a first-principles based model for property prediction in such complex semiconductor materials is presented. This framework incorporates nonequilibrium synthesis, dopants and defects, and the change of the electronic structure with composition and short range order. This approach is applied to ZnSnN2 (ZTN) which has attracted recent interest for photovoltaics. The unintentional oxygen incorporation and its correlation with the cation stoichiometry leads to the formation of a solid solution with dual sublattice mixing. A nonmonotonic doping behavior as a function of the composition is uncovered. The degenerate doping of near-stoichiometric ZTN, which is detrimental for potential applications, can be lowered into the 1017 cm-3 range in highly off-stoichiometric material, in quantitative agreement with experiments.
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Affiliation(s)
- Jie Pan
- Materials Science Center, National Renewable Energy Laboratory, Golden, CO, 80401, USA
| | - Jacob Cordell
- Materials Science Center, National Renewable Energy Laboratory, Golden, CO, 80401, USA
- Department of Mechanical Engineering, Colorado School of Mines, Golden, CO, 80401, USA
| | - Garritt J Tucker
- Department of Mechanical Engineering, Colorado School of Mines, Golden, CO, 80401, USA
| | - Adele C Tamboli
- Materials Science Center, National Renewable Energy Laboratory, Golden, CO, 80401, USA
| | - Andriy Zakutayev
- Materials Science Center, National Renewable Energy Laboratory, Golden, CO, 80401, USA
| | - Stephan Lany
- Materials Science Center, National Renewable Energy Laboratory, Golden, CO, 80401, USA
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Jiang Z, Nahas Y, Xu B, Prosandeev S, Wang D, Bellaiche L. Special quasirandom structures for perovskite solid solutions. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:475901. [PMID: 27661191 DOI: 10.1088/0953-8984/28/47/475901] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Special quasirandom structures (SQS) are presently generated for disordered (A'1-x [Formula: see text] x )BX3 and A(B'1-x [Formula: see text] x )X3 perovskite solid solutions, with x = 1/2 as well as 1/3 and 2/3. These SQS configurations are obtained by imposing that the so-called Cowley parameters are as close to zero as possible for the three nearest neighboring shells. Moreover, these SQS configurations are slightly larger in size than those available in the literature for x = 1/2, mostly because of the current capabilities of atomistic techniques. They are used here within effective Hamiltonian schemes to predict various properties, which are then compared to those associated with large random supercells, in a variety of compounds, namely (Ba1-x Sr x )TiO3, Pb(Zr1-x Ti x )O3, Pb(Sc0.5Nb0.5)O3, Ba(Zr1-x Ti x )O3, Pb(Mg1/3Nb2/3)O3 and (Bi1-x Nd x )FeO3. It is found that these SQS configurations can reproduce many properties of large random supercells of most of these disordered perovskite alloys, below some finite material-dependent temperature. Examples of these properties are electrical polarization, anti-phase and in-phase octahedral tiltings, antipolar motions, antiferromagnetism, strain, piezoelectric coefficients, dielectric response, specific heat and even the formation of polar nanoregions (PNRs) in some relaxors. Some limitations of these SQS configurations are also pointed out and explained.
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Affiliation(s)
- Zhijun Jiang
- School of Electronic and Information Engineering & State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China. Physics Department and Institute for Nanoscience and Engineering, University of Arkansas, Fayetteville, AR 72701, USA
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Kwon SJ, Jeong HM, Jung K, Ko DH, Ko H, Han IK, Kim GT, Park JG. Structural Origin of the Band Gap Anomaly of Quaternary Alloy Cd(x)Zn(1-x)S(y)Se(1-y) Nanowires, Nanobelts, and Nanosheets in the Visible Spectrum. ACS NANO 2015; 9:5486-5499. [PMID: 25897466 DOI: 10.1021/acsnano.5b01472] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Single-crystalline alloy II-VI semiconductor nanostructures have been used as functional materials to propel photonic and optoelectronic device performance in a broad range of the visible spectrum. Their functionality depends on the stable modulation of the direct band gap (Eg), which can be finely tuned by controlling the properties of alloy composition, crystallinity, and morphology. We report on the structural correlation of the optical band gap anomaly of quaternary alloy CdxZn1-xSySe1-y single-crystalline nanostructures that exhibit different morphologies, such as nanowires (NWs), nanobelts (NBs), and nanosheets (NSs), and cover a wide range of the visible spectrum (Eg = 1.96-2.88 eV). Using pulsed laser deposition, the nanostructures evolve from NWs via NBs to NSs with decreasing growth temperature. The effects of the growth temperature are also reflected in the systematic variation of the composition. The alloy nanostructures firmly maintain single crystallinity of the hexagonal wurtzite and the nanoscale morphology, with no distortion of lattice parameters, satisfying the virtual crystal model. For the optical properties, however, we observed distinct structure-dependent band gap anomalies: the disappearance of bowing for NWs and maximum and slightly reduced bowing for NBs and NSs, respectively. We tried to uncover the underlying mechanism that bridges the structural properties and the optical anomaly using an empirical pseudopotential model calculation of electronic band structures. From the calculations, we found that the optical bowings in NBs and NSs were due to residual strain, by which they are also distinguishable from each other: large for NBs and small for NSs. To explain the origin of the residual strain, we suggest a semiempirical model that considers intrinsic atomic disorder, resulting from the bond length mismatch, combined with the strain relaxation factor as a function of the width-to-thickness ratio of the NBs or NSs. The model agreed well with the observed optical bowing of the alloy nanostructures in which a mechanism for the maximum bowing for NBs is explained. The present systematic study on the structural-optical properties correlation opens a new perspective to understand the morphology- and composition-dependent unique optical properties of II-VI alloy nanostructures as well as a comprehensive strategy to design a facile band gap modulation method of preparing photoconverting and photodetecting materials.
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Affiliation(s)
- S Joon Kwon
- †Nanophotonics Research Center, Future Convergence of Technology Research Division, Korea Institute of Science and Technology (KIST), Seoul 136-791, Korea
| | - Hae-Min Jeong
- †Nanophotonics Research Center, Future Convergence of Technology Research Division, Korea Institute of Science and Technology (KIST), Seoul 136-791, Korea
- ‡School of Electrical Engineering, Korea University, Seoul 136-713, Korea
| | - Kinam Jung
- †Nanophotonics Research Center, Future Convergence of Technology Research Division, Korea Institute of Science and Technology (KIST), Seoul 136-791, Korea
| | - Doo-Hyun Ko
- †Nanophotonics Research Center, Future Convergence of Technology Research Division, Korea Institute of Science and Technology (KIST), Seoul 136-791, Korea
- §Department of Applied Chemistry, Kyung Hee University, Yongin Si 446-701, Korea
| | - Hyungduk Ko
- †Nanophotonics Research Center, Future Convergence of Technology Research Division, Korea Institute of Science and Technology (KIST), Seoul 136-791, Korea
| | - Il-Ki Han
- †Nanophotonics Research Center, Future Convergence of Technology Research Division, Korea Institute of Science and Technology (KIST), Seoul 136-791, Korea
| | - Gyu Tae Kim
- ‡School of Electrical Engineering, Korea University, Seoul 136-713, Korea
| | - Jae-Gwan Park
- †Nanophotonics Research Center, Future Convergence of Technology Research Division, Korea Institute of Science and Technology (KIST), Seoul 136-791, Korea
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Giorgi G, Van Schilfgaarde M, Korkin A, Yamashita K. On the Chemical Origin of the Gap Bowing in (GaAs)(1-x)Ge(2x) Alloys: A Combined DFT-QSGW Study. NANOSCALE RESEARCH LETTERS 2010; 5:469-477. [PMID: 20671794 PMCID: PMC2893788 DOI: 10.1007/s11671-009-9516-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/20/2009] [Accepted: 12/17/2009] [Indexed: 05/29/2023]
Abstract
Motivated by the research and analysis of new materials for photovoltaics and by the possibility of tailoring their optical properties for improved solar energy conversion, we have focused our attention on the (GaAs)(1-x)Ge(2x) series of alloys. We have investigated the structural properties of some (GaAs)(1-x)Ge(2x) compounds within the local-density approximation to density-functional theory, and their optical properties within the Quasiparticle Self-consistent GW approximation. The QSGW results confirm the experimental evidence of asymmetric bandgap bowing. It is explained in terms of violations of the octet rule, as well as in terms of the order-disorder phase transition.
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Affiliation(s)
- Giacomo Giorgi
- Department of Chemical System Engineering, School of Engineering, University of Tokyo, Tokyo, 113-8656, Japan
| | | | | | - Koichi Yamashita
- Department of Chemical System Engineering, School of Engineering, University of Tokyo, Tokyo, 113-8656, Japan
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Bousahla Z, Abbar B, Bouhafs B, Tadjer A. Full potential linearized augmented plane wave calculations of positronic and electronic charge densities of zinc-blende AlN, InN and their alloy Al0.5In0.5N. J SOLID STATE CHEM 2005. [DOI: 10.1016/j.jssc.2005.03.047] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Bellaiche L, Wei S, Zunger A. Localization and percolation in semiconductor alloys: GaAsN vs GaAsP. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:17568-17576. [PMID: 9985881 DOI: 10.1103/physrevb.54.17568] [Citation(s) in RCA: 110] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kim DS, Ko HS, Kim YM, Rhee SJ, Hohng SC, Yee YH, Kim WS, Woo JC, Choi HJ, Ihm J, Woo DH, Kang KN. Percolation of carriers through low potential channels in thick AlxGa1-xAs (x<0.35) barriers. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:14580-14588. [PMID: 9985465 DOI: 10.1103/physrevb.54.14580] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Wang LW, Zunger A. Pseudopotential-based multiband k. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:11417-11435. [PMID: 9984931 DOI: 10.1103/physrevb.54.11417] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Hassine A, Sapriel J, Alexandre F, Quillec M. Superlattice effects induced by atomic ordering on GaxIn1-xP Raman modes. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:2728-2732. [PMID: 9986124 DOI: 10.1103/physrevb.54.2728] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Alsina F, Mestres N, Pascual J, Geng C, Ernst P, Scholz F. Raman scattering in single-variant spontaneously ordered GaInP2. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:12994-13001. [PMID: 9982976 DOI: 10.1103/physrevb.53.12994] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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