TITLE

Negative differential photoconductivity in quantum-dot infrared photodetectors

AUTHOR(S)
Ryzhii, V.
PUB. DATE
May 2001
SOURCE
Applied Physics Letters;5/21/2001, Vol. 78 Issue 21, p3346
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We present a simple model for quantum-dot infrared photodetectors (QDIPs) describing nontrivial (decreasing) dependences of the photocurrent on the QD density and the applied voltage. It is shown that recent experiments demonstrating a negative differential photoconductivity in QDIPs can be interpreted in terms of this model. The effects under consideration can be attributed to the repulsive potential of charged quantum dots and heating of mobile electrons influencing the rate of the electron capture. Qualitative distinctions between the QDIP photocurrent-voltage and dark current-voltage characteristics are explained as well. © 2001 American Institute of Physics.
ACCESSION #
4715200

 

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