Dependence of the performance of GaAs/AlGaAs quantum well infrared photodetectors on doping and bias

S. D. Gunapala, B. F. Levine, L. Pfeiffer, K. West

Research output: Contribution to journalArticlepeer-review

82 Scopus citations

Abstract

We have measured and theoretically analyzed the doping density, N D, dependence of the intersubband absorption coefficient α, the quantum efficiency η, the optical gain g, the dark current ID, and the detectivity D*. We discuss the optimum doping and show that D* depends only weakly on both ND and also the bias voltage, Vb. In particular, we find that the dark current can be reduced by three orders of magnitude, without significantly reducing the detectivity. This would substantially alleviate the undesirable filling of imaging array multiplexer storage capacitors, thereby allowing longer integration times and thus higher sensitivity.

Original languageEnglish (US)
Pages (from-to)6517-6520
Number of pages4
JournalJournal of Applied Physics
Volume69
Issue number9
DOIs
StatePublished - 1991
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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