Low-power photocurrent nonlinearity in quantum well infrared detectors

被引：23

作者：

Mermelstein, C ^{[1
]}

Schneider, H ^{[1
]}

Saar, A ^{[1
]}

Schonbein, C ^{[1
]}

Walther, M ^{[1
]}

Bihlmann, G ^{[1
]}

机构：

[1] FRAUNHOFER INST APPL SOLID STATE PHYS,D-79108 FREIBURG,GERMANY

来源：

APPLIED PHYSICS LETTERS | 1997年 / 71卷 / 14期

关键词：

D O I：

10.1063/1.119771

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report on the intensity dependence of the responsivity in quantum well infrared photodetectors (QWIP). A strong reduction of the responsivity is observed already at small excitation powers for a QWIP with N=4 periods. This nonlinearity is caused by a partial screening of the electric field across the main part of the active region. The intensity dependence is analyzed using a phenomenological approach, which allows us to calculate the nonlinearity from the measured dark current and responsivity. Applying this approach to a background-limited 50 period QWIP, we find that the nonlinearity is already present below 1 mW cm(-2), which is less than the thermal background. (C) 1997 American Institute of Physics.

引用

页码：2011 / 2013

页数：3

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