Effects of the host conduction band energy on the electronic band structure of ZnCdTeO dilute oxide alloys
Abstract
Interband optical transitions in highly mismatched ZnTe1−xOx and Zn1−yCdyTe1−xOx alloys with Cd content y = 0.1 and 0.32 and oxygen content x < 0.016 grown on ZnTe substrates were studied by photoreflectance (PR) and photoluminescence (PL) in a broad temperature range. The incorporation of oxygen into a Zn(Cd)Te matrix results in a splitting of the conduction band (CB) into two E− and E+ subbands forming a semiconductor with an intermediate band. In ZnTeO, only the E− band could be probed by PR and there was no PL signal. An addition of Cd atoms to form a ZnCdTeO quaternary alloy significantly improves the optical quality as evidenced by an emergence of an E+ related transition in the PR spectra and the appearance of a PL emission related to the E− band visible up to 260 K. Moreover, for Cd content above 25%, a change in the E− band character is observed from localized O-like to CB-like. The analysis of a PR signal shows a strong reduction of the temperature dependence of the energy gap of Zn(Cd)TeO alloys compared to ZnTe. The temperature related reduction of the bandgap shift with increasing O content is well explained by the band anticrossing interaction between the temperature dependent conduction bandmore »
- Authors:
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1558742
- Grant/Contract Number:
- AC02-05CH11231; 18K19046; 19H02661
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Journal of Applied Physics
- Additional Journal Information:
- Journal Name: Journal of Applied Physics Journal Volume: 126 Journal Issue: 8; Journal ID: ISSN 0021-8979
- Publisher:
- American Institute of Physics
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Welna, M., Janicki, Ł., Linhart, W. M., Tanaka, T., Yu, K. M., Kudrawiec, R., and Walukiewicz, W. Effects of the host conduction band energy on the electronic band structure of ZnCdTeO dilute oxide alloys. United States: N. p., 2019.
Web. doi:10.1063/1.5111600.
Welna, M., Janicki, Ł., Linhart, W. M., Tanaka, T., Yu, K. M., Kudrawiec, R., & Walukiewicz, W. Effects of the host conduction band energy on the electronic band structure of ZnCdTeO dilute oxide alloys. United States. https://doi.org/10.1063/1.5111600
Welna, M., Janicki, Ł., Linhart, W. M., Tanaka, T., Yu, K. M., Kudrawiec, R., and Walukiewicz, W. Mon .
"Effects of the host conduction band energy on the electronic band structure of ZnCdTeO dilute oxide alloys". United States. https://doi.org/10.1063/1.5111600.
@article{osti_1558742,
title = {Effects of the host conduction band energy on the electronic band structure of ZnCdTeO dilute oxide alloys},
author = {Welna, M. and Janicki, Ł. and Linhart, W. M. and Tanaka, T. and Yu, K. M. and Kudrawiec, R. and Walukiewicz, W.},
abstractNote = {Interband optical transitions in highly mismatched ZnTe1−xOx and Zn1−yCdyTe1−xOx alloys with Cd content y = 0.1 and 0.32 and oxygen content x < 0.016 grown on ZnTe substrates were studied by photoreflectance (PR) and photoluminescence (PL) in a broad temperature range. The incorporation of oxygen into a Zn(Cd)Te matrix results in a splitting of the conduction band (CB) into two E− and E+ subbands forming a semiconductor with an intermediate band. In ZnTeO, only the E− band could be probed by PR and there was no PL signal. An addition of Cd atoms to form a ZnCdTeO quaternary alloy significantly improves the optical quality as evidenced by an emergence of an E+ related transition in the PR spectra and the appearance of a PL emission related to the E− band visible up to 260 K. Moreover, for Cd content above 25%, a change in the E− band character is observed from localized O-like to CB-like. The analysis of a PR signal shows a strong reduction of the temperature dependence of the energy gap of Zn(Cd)TeO alloys compared to ZnTe. The temperature related reduction of the bandgap shift with increasing O content is well explained by the band anticrossing interaction between the temperature dependent conduction band of the host Zn(Cd)Te matrix and the temperature independent energy of highly localized O states.},
doi = {10.1063/1.5111600},
journal = {Journal of Applied Physics},
number = 8,
volume = 126,
place = {United States},
year = {Mon Aug 26 00:00:00 EDT 2019},
month = {Mon Aug 26 00:00:00 EDT 2019}
}
https://doi.org/10.1063/1.5111600
Web of Science
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