Dependence of the persistent photoconductivity in doping-modulated a-Si: H multilayers on the exposure temperature
作者:
A. Vomvas,
H. Fritzsche,
期刊:
Philosophical Magazine Letters
(Taylor Available online 1987)
卷期:
Volume 56,
issue 5
页码: 197-201
ISSN:0950-0839
年代: 1987
DOI:10.1080/09500838708214708
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
We find that the photo-induced excess conductivity (persistent photoconductivity, PPC) in doping-modulated hydrogenated amorphous silicon (a-Si: H) is thermally activated for exposure temperatures above 220 K in agreement with Kakalios and with Hundhausen and Ley. However, we find a temperature regime between 80 and 220 Kin which the PPC measured at 300 K is independent of excitation temperature. Whether the PPC is excited in the thermally activated regime above 220 K or in the temperature-independent regime, the annealing occurs at 410 K. The pre-exponential factor and the activation energy of PPC are related by the Meyer-Neldel rule independent of the excitation temperature.
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