Optical properties of Zn 1-xMn xTe epilayers grown by molecular beam epitaxy

Yu-Tai Shih, W. C. Chiang, C. S. Yang, M. C. Kuo, W. C. Chou

Research output: Contribution to journalArticle

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Abstract

Zn 1-xMn xTe (0≤x≤0.268) epilayers were grown on GaAs(001) substrates by molecular beam epitaxy. The optical properties of the epilayers were studied using reflectivity, transmission, and photoluminescence (PL) measurements. The energy gaps of the epilayers were found to increase linearly with Mn concentration. From the PL spectra, a redshift of the PL peaks was observed as the temperature was increased. The exciton activation energies of the epilayers were determined by the plots of logarithmic-integrated PL intensity versus inverse temperature. Accordingly, they increase with Mn concentration. The Varshni and O'Donnell relations, which mimic the temperature dependence of semiconductor energy gaps were used to fit the experimental data [Y. P. Varshni, Physica 34, 149 (1967); R. P. O'Donnell and X. Chen, Appl. Phys. Lett. 58, 2924 (1991)]. Good fits were obtained by both relations. From the fitted results, the entropy of formation of electron-hole pairs in the Zn 1-xMn xTe epilayers at room temperature was estimated to be roughly 0.5 meV/K.

Original languageEnglish
Pages (from-to)2446-2450
Number of pages5
JournalJournal of Applied Physics
Volume92
Issue number5
DOIs
Publication statusPublished - 2002 Sep 1

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molecular beam epitaxy
photoluminescence
optical properties
plots
excitons
entropy
activation energy
reflectance
temperature dependence
temperature
room temperature

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Shih, Yu-Tai ; Chiang, W. C. ; Yang, C. S. ; Kuo, M. C. ; Chou, W. C. / Optical properties of Zn 1-xMn xTe epilayers grown by molecular beam epitaxy. In: Journal of Applied Physics. 2002 ; Vol. 92, No. 5. pp. 2446-2450.
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Optical properties of Zn 1-xMn xTe epilayers grown by molecular beam epitaxy. / Shih, Yu-Tai; Chiang, W. C.; Yang, C. S.; Kuo, M. C.; Chou, W. C.

In: Journal of Applied Physics, Vol. 92, No. 5, 01.09.2002, p. 2446-2450.

Research output: Contribution to journalArticle

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