Photoconductivity nonlinearity at high excitation power in quantum well infrared photodetectors
- 27 January 1997
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 70 (4) , 414-416
- https://doi.org/10.1063/1.118320
Abstract
Nonlinear photoconductivity effects at high excitation power in quantum well infrared photodetectors (QWIPs) are studied both experimentally and theoretically. The photoconductivity nonlinearity is mainly caused by a redistribution of the electric potential at high power, which leads to a decrease of electric field in the bulk of the QWIP. As a result of the decreased field, the photoexcited electron escape probability and drift velocity decrease resulting in a decrease of responsivity.Keywords
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