On the detectivity of quantum-dot infrared photodetectors

Ryzhii, V.; Khmyrova, I.; Mitin, V.; Stroscio, M.; Willander, M.
May 2001
Applied Physics Letters;5/28/2001, Vol. 78 Issue 22, p3523
Academic Journal
We report on the analysis of thermally-limited operation of quantum-dot infrared photodetectors (QDIPs). A device model is developed and used to calculate the QDIP detectivity as a function of the structural parameters, temperature, and applied voltage, as well as to determine the conditions for the detectivity maximum. The QDIP detectivity is compared with that of quantum-well infrared photodetectors (QWIPs). This work clarifies why the existing QDIPs are still inferior to QWIPs and shows that a significant improvement in the QDIP performance can be accomplished by the utilization of dense QD arrays with small QDs. © 2001 American Institute of Physics.


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