Energy band‐gap calculations of short‐period (ZnTe)m(ZnSe)nand (ZnS)m(ZnSe)nstrained‐layer superlattices
作者:
Yi‐hong Wu,
Shizuo Fujita,
Shigeo Fujita,
期刊:
Journal of Applied Physics
(AIP Available online 1990)
卷期:
Volume 67,
issue 2
页码: 908-914
ISSN:0021-8979
年代: 1990
DOI:10.1063/1.345752
出版商: AIP
数据来源: AIP
摘要:
We report on the calculations of energy band gaps based on the semiempirical tight‐binding model for short‐period (ZnTe)m(ZnSe)nand (ZnS)m(ZnSe)nstrained‐layer superlattices (SLSs). During the calculation, much attention has been paid to the modeling of strain effect. It is found that (ZnTe)m(ZnSe)nsuperlattices grown on InAs, InP, and GaAs substrates show very different electronic properties from each other, which is consistent with experimental results now available. Assuming that the emission observed for (ZnTe)m(ZnSe)nSLS originates from intrinsic luminescence, we obtain an unstrained valence‐band offset of 1.136±0.1 eV for this superlattice. On the other hand, the band gap of (ZnS)m(ZnSe)nsuperlattice grown coherently on GaP is found to exhibit a much stronger structure dependence than that grown coherently on GaAs. The difference of energy gap between superlattice with equal monolayers (m=n) and the corresponding alloy with equal chalcogenide composition is also discussed.
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