Anomalous thermally stimulated currents in CaS |
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| Institution: | 1. N. S. Kurnakov Institute of General and Inorganic Chemistry, 31 Leninskiy Prospekt, Moscow, 119991, Russia;2. P. N. Lebedev Physical Institute, 53 Leninskiy Prospekt, Moscow, 119991, Russia;1. Department of Chemistry, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong S. A. R., PR China;2. Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong S. A. R., PR China;3. Department of Applied Physics, The Hong Kong Polytechnic University, Kowloon, 999077, Hong Kong, PR China |
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| Abstract: | Information on the nature of traps in CaS has been sought by studying the TSC behaviour in a range of samples. Results are in agreement with those reported previously and suggest that the TSC peak at 308 ± 3K is independent of the nature and concentration of dopant. Evidence is presented which indicates that surface states are responsible for the currents rather than the release of trapped charge from states within the band gap; the source of the charge carriers is uncertain. Simultaneous TSC and TL measurements on CaS:Ce, Cu indicate that the TL peak at 300K and the TSC peak at 308K are mutually independent. |
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