Highly mismatched GaN1-xSbx alloys: Synthesis, structure and electronic properties

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Highly mismatched GaN1-xSbx alloys : Synthesis, structure and electronic properties. / Yu, K. M.; Sarney, W. L.; Novikov, S. V.; Segercrantz, N.; Ting, M.; Shaw, M.; Svensson, S. P.; Martin, R. W.; Walukiewicz, W.; Foxon, C. T.

In: Semiconductor Science and Technology, Vol. 31, No. 8, 083001, 28.06.2016, p. 1-22.

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Yu, KM, Sarney, WL, Novikov, SV, Segercrantz, N, Ting, M, Shaw, M, Svensson, SP, Martin, RW, Walukiewicz, W & Foxon, CT 2016, 'Highly mismatched GaN1-xSbx alloys: Synthesis, structure and electronic properties' Semiconductor Science and Technology, vol. 31, no. 8, 083001, pp. 1-22. https://doi.org/10.1088/0268-1242/31/8/083001

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Yu, K. M. ; Sarney, W. L. ; Novikov, S. V. ; Segercrantz, N. ; Ting, M. ; Shaw, M. ; Svensson, S. P. ; Martin, R. W. ; Walukiewicz, W. ; Foxon, C. T. / Highly mismatched GaN1-xSbx alloys : Synthesis, structure and electronic properties. In: Semiconductor Science and Technology. 2016 ; Vol. 31, No. 8. pp. 1-22.

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@article{8a0ad8f0ae58442f9119ef95bbfe706f,
title = "Highly mismatched GaN1-xSbx alloys: Synthesis, structure and electronic properties",
abstract = "Highly mismatched alloys (HMAs) is a class of semiconductor alloys whose constituents are distinctly different in terms of size, ionicity and/or electronegativity. Electronic properties of the alloys deviate significantly from an interpolation scheme based on small deviations from the virtual crystal approximation. Most of the HMAs were only studied in a dilute composition limit. Recent advances in understanding of the semiconductor synthesis processes allowed growth of thin films of HMAs under non-equilibrium conditions. Thus reducing the growth temperature allowed synthesis of group III-N-V HMAs over almost the entire composition range. This paper focuses on the GaN xSb1-x HMA which has been suggested as a potential material for solar water dissociation devices. Here we review our recent work on the synthesis, structural and optical characterization of GaN1-xSb x HMA. Theoretical modeling studies on its electronic structure based on the band anticrossing (BAC) model are also reviewed. In particular we discuss the effects of growth temperature, Ga flux and Sb flux on the incorporation of Sb, film microstructure and optical properties of the alloys. Results obtained from two separate MBE growths are directly compared. Our work demonstrates that a large range of direct bandgap energies from 3.4 eV to below 1.0 eV can be achieved for this alloy grown at low temperature. We show that the electronic band structure of GaN1-xSb x HMA over the entire composition range is well described by a modified BAC model which includes the dependence of the host matrix band edges as well as the BAC model coupling parameters on composition. We emphasize that the modified BAC model of the electronic band structure developed for the full composition of GaN x Sb 1-x is general and is applicable to any HMA.",
keywords = "band anticrossing, electronic band structure, highly mismatched alloys, nitride, photoelectrochemical water splitting",
author = "Yu, {K. M.} and Sarney, {W. L.} and Novikov, {S. V.} and N. Segercrantz and M. Ting and M. Shaw and Svensson, {S. P.} and Martin, {R. W.} and W. Walukiewicz and Foxon, {C. T.}",
year = "2016",
month = "6",
day = "28",
doi = "10.1088/0268-1242/31/8/083001",
language = "English",
volume = "31",
pages = "1--22",
journal = "Semiconductor Science and Technology",
issn = "0268-1242",
number = "8",

}

RIS - Download

TY - JOUR

T1 - Highly mismatched GaN1-xSbx alloys

T2 - Synthesis, structure and electronic properties

AU - Yu, K. M.

AU - Sarney, W. L.

AU - Novikov, S. V.

AU - Segercrantz, N.

AU - Ting, M.

AU - Shaw, M.

AU - Svensson, S. P.

AU - Martin, R. W.

AU - Walukiewicz, W.

AU - Foxon, C. T.

PY - 2016/6/28

Y1 - 2016/6/28

N2 - Highly mismatched alloys (HMAs) is a class of semiconductor alloys whose constituents are distinctly different in terms of size, ionicity and/or electronegativity. Electronic properties of the alloys deviate significantly from an interpolation scheme based on small deviations from the virtual crystal approximation. Most of the HMAs were only studied in a dilute composition limit. Recent advances in understanding of the semiconductor synthesis processes allowed growth of thin films of HMAs under non-equilibrium conditions. Thus reducing the growth temperature allowed synthesis of group III-N-V HMAs over almost the entire composition range. This paper focuses on the GaN xSb1-x HMA which has been suggested as a potential material for solar water dissociation devices. Here we review our recent work on the synthesis, structural and optical characterization of GaN1-xSb x HMA. Theoretical modeling studies on its electronic structure based on the band anticrossing (BAC) model are also reviewed. In particular we discuss the effects of growth temperature, Ga flux and Sb flux on the incorporation of Sb, film microstructure and optical properties of the alloys. Results obtained from two separate MBE growths are directly compared. Our work demonstrates that a large range of direct bandgap energies from 3.4 eV to below 1.0 eV can be achieved for this alloy grown at low temperature. We show that the electronic band structure of GaN1-xSb x HMA over the entire composition range is well described by a modified BAC model which includes the dependence of the host matrix band edges as well as the BAC model coupling parameters on composition. We emphasize that the modified BAC model of the electronic band structure developed for the full composition of GaN x Sb 1-x is general and is applicable to any HMA.

AB - Highly mismatched alloys (HMAs) is a class of semiconductor alloys whose constituents are distinctly different in terms of size, ionicity and/or electronegativity. Electronic properties of the alloys deviate significantly from an interpolation scheme based on small deviations from the virtual crystal approximation. Most of the HMAs were only studied in a dilute composition limit. Recent advances in understanding of the semiconductor synthesis processes allowed growth of thin films of HMAs under non-equilibrium conditions. Thus reducing the growth temperature allowed synthesis of group III-N-V HMAs over almost the entire composition range. This paper focuses on the GaN xSb1-x HMA which has been suggested as a potential material for solar water dissociation devices. Here we review our recent work on the synthesis, structural and optical characterization of GaN1-xSb x HMA. Theoretical modeling studies on its electronic structure based on the band anticrossing (BAC) model are also reviewed. In particular we discuss the effects of growth temperature, Ga flux and Sb flux on the incorporation of Sb, film microstructure and optical properties of the alloys. Results obtained from two separate MBE growths are directly compared. Our work demonstrates that a large range of direct bandgap energies from 3.4 eV to below 1.0 eV can be achieved for this alloy grown at low temperature. We show that the electronic band structure of GaN1-xSb x HMA over the entire composition range is well described by a modified BAC model which includes the dependence of the host matrix band edges as well as the BAC model coupling parameters on composition. We emphasize that the modified BAC model of the electronic band structure developed for the full composition of GaN x Sb 1-x is general and is applicable to any HMA.

KW - band anticrossing

KW - electronic band structure

KW - highly mismatched alloys

KW - nitride

KW - photoelectrochemical water splitting

UR - http://www.scopus.com/inward/record.url?scp=84979619468&partnerID=8YFLogxK

U2 - 10.1088/0268-1242/31/8/083001

DO - 10.1088/0268-1242/31/8/083001

M3 - Article

VL - 31

SP - 1

EP - 22

JO - Semiconductor Science and Technology

JF - Semiconductor Science and Technology

SN - 0268-1242

IS - 8

M1 - 083001

ER -

ID: 6750509