Photoluminescence of deep levels in (CdZn) Te-correlation with diffusion length measurement

Franc, J. and Hli­dek, P. and Sitter, H. and Belas, E. and Toth, A.L. and Turjanska, L. and Hoschl, P. (1999) Photoluminescence of deep levels in (CdZn) Te-correlation with diffusion length measurement. Physica B: Condensed Matter, 273-27 . pp. 883-886. ISSN 09214526

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Abstract

Photoluminescence of deep levels near mid-gap in P-(Cd1-xZnx)Te (x�0.03-0.05) grown by the vertical gradient freezing method was investigated. Correlation with recombination properties manifested by temperature dependence of diffusion length of minority electrons and the corresponding mobility-lifetime product was studied. Low-temperature photoluminescence (PL) in the spectral range 0.68-1.3 eV and a temperature dependence of diffusion length of minority electrons (DL) measured by EBIC in the temperature range 60-300 K on both as-grown and annealed samples (800 °C and 900 °C) were investigated. We observed, that while as-grown samples exhibited a steep increase in DL with decreasing temperature in the temperature range 60-140 K, annealing and subsequent quenching resulted in a significant decrease of DL at these temperatures. Photoluminescence band with a peak at approx. 0.84 eV in annealed samples with increased recombination and therefore low DL was observed, while no such peak was detected in the as-grown samples with high DL. Luminescence in the �0.8 eV band is usually attributed to a VCd related defect which is supposed to act as a recombination centre. It can be concluded, that a correlation between effects of increased recombination manifested by decreased values of DL at temperatures 60-140 K and detection of the�0.8 eV PL band was observed. Reduction of the mobility-lifetime product by increased recombination in (CdZn)Te single crystals is therefore probably connected with a presence of a VCd-related defect.

Additional Information:Conference of Proceedings of the 1999 20th International Conference on Defects in Semiconductors (ICDS-20) ; Conference Date: 26 July 1999 Through 30 July 1999; Conference Code:56247
Keywords:Annealing, Carrier mobility, Energy gap, Interdiffusion (solids), Photoluminescence, Quenching, Semiconductor growth, Deep levels, Mobility-lifetime products, Semiconducting cadmium compounds
Subjects:F Physical Sciences > F300 Physics
Divisions:College of Science > School of Chemistry
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ID Code:22506
Deposited On:07 Apr 2016 07:43

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