Two-color infrared detection using intersubband transitions in multiple step quantum wells with superlattice barriers
作者:
Ting Mei,
G. Karunasiri,
S. J. Chua,
期刊:
Applied Physics Letters
(AIP Available online 1997)
卷期:
Volume 71,
issue 14
页码: 2017-2019
ISSN:0003-6951
年代: 1997
DOI:10.1063/1.119773
出版商: AIP
数据来源: AIP
摘要:
A dual-band multiple quantum well infrared photodetector has been fabricated for the near and mid-infrared detection. The structure consists of InGaAs/GaAs step quantum wells separated by AlGaAs/GaAs superlattice barriers. The step quantum wells are designed to have two bound states and a quasi-continuum above the superlattice barriers. The bound-to-bound and bound-to-continuum transitions are employed for the dual-band detection. The superlattice barriers are used to extract the photocurrent from the bound-to-bound transition with a relatively low external electric field, which keeps the dark current low. This work demonstrates the use of a new quantum well structure for the fabrication of multicolor quantum well infrared photodetectors. ©1997 American Institute of Physics.
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