期刊
INFRARED PHYSICS & TECHNOLOGY
卷 111, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.infrared.2020.103522
关键词
Bandgap; Molecular beam epitaxy; HgCdSe; GaSb substrates; Infrared detector
资金
- Australian Research Council [FT130101708, DP170104562, LE170100233]
- University of Western Australia
- Australian National Fabrication Facility (ANFF)
- Australian Research Council [FT130101708, LE170100233] Funding Source: Australian Research Council
Temperature-dependent infrared transmission spectroscopy has been applied to study the optical properties of Hg0.815Cd0.185Se thin film grown by molecular beam epitaxy on GaSb (211)B substrate. Discrepancies were observed between the measured optical bandgaps and the calculated values based on the previously reported empirical expression for the energy bandgap E-g(x, T) of Hg1-xCdxSe. A new empirical expression has been established based on ab initio calculations, and the results are shown to be in a good agreement with the experimental data of this study. By comparing both expressions with all of known experimental data for x <= 0.354 from other studies over the temperature range of 0 < T < 310 K, it is found that for the new expression presented in this study, the standard error between calculations and experimental data is 0.010 eV which is comparable to that of the previously reported expression for Hg1-xCdxSe with 0.194 <= x <= 0.354 and is approximately 50% more accurate for 0 <= x <= 0.19.
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