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Optical Characterization of Bulk ZnSeTe Solid SolutionsOptical characterization was performed on wafers sliced from crystals of ZnSe, ZnTe, and ZnSe(1-x)Te(x)(0 less than x less than 0.4) grown by physical vapor transport. Energy band gaps at room temperature were determined from optical transmission measurements on 11 wafers. A best fit curve to the band gap versus composition x data gives a bowing parameter of 1.45. This number lies between the value of 1.23 determined previously on ZnSeTe bulk crystals and the value of 1.621 reported on ZnSeTe epilayers. Low-temperature photoluminescence (PL) spectra were measured on six samples. The spectra of ZnSe and ZnTe were dominated by near band edge emissions and no deep donor-acceptor pairs were observed. The PL spectrum exhibited a broad emission for each of the ZnSe(1-x)Te(x) samples, 0.09 less than x less than 0.39. For x=0.09, this emission energy is about 0.2 eV lower than the band gap energy measured at low temperature. As x increases the energy discrepancy gradually decreases and reduces to almost zero at x=0.4. The single broad PL emission spectra and the spectra measured as a function of temperature were interpreted as being associated with the exciton bound to Te clusters because of the high Te content in these samples.
Document ID
20010047554
Acquisition Source
Headquarters
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Su, Ching-Hua
(NASA Marshall Space Flight Center Huntsville, AL United States)
Feth, S.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Zhu, Shen
(NASA Marshall Space Flight Center Huntsville, AL United States)
Lehoczky, S. L.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Wang, Ling Jun
(Tennessee Univ. Chattanooga, TN United States)
Date Acquired
August 20, 2013
Publication Date
November 1, 2000
Publication Information
Publication: Journal of Applied Physics
Publisher: American Institute of Physics
Volume: 88
Issue: 9
ISSN: 0021-8979
Subject Category
Solid-State Physics
Distribution Limits
Public
Copyright
Other

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