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Proceedings Paper

Corrugated quantum well infrared photodetectors
Author(s): C. J. Chen; Kwong-Kit Choi; Wayne H. Chang; Daniel C. Tsui
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Paper Abstract

A new light coupling geometry for quantum well infrared photodetectors (QWIP), which is referred as the corrugated- QWIP or the C-QWIP, has been demonstrated. The coupling scheme is based on the total internal reflection at a number of slanted sidewalls created within a detector pixel. The structure was found to be able to couple normal incident light efficiently into the detector with concomitant reduction in the dark current. For a C-QWIP with thinned substrate, the background photocurrent to the dark current ratio is improved by a factor of 4.9 compared with the edge coupling. The coupling scheme does not show significant wavelength and size dependence, and is therefore suitable for multi-color or high resolution thermal imaging. With these characteristics, a C- QWIP behaves as a detector with normal incident absorption. Because of its simple fabrication procedures, the manufacturability of the detector arrays can be greatly improved.

Paper Details

Date Published: 13 August 1997
PDF: 12 pages
Proc. SPIE 3061, Infrared Technology and Applications XXIII, (13 August 1997); doi: 10.1117/12.280391
Show Author Affiliations
C. J. Chen, Princeton Univ. (United States)
Kwong-Kit Choi, Army Research Lab. (United States)
Wayne H. Chang, Army Research Lab. (United States)
Daniel C. Tsui, Princeton Univ. (United States)

Published in SPIE Proceedings Vol. 3061:
Infrared Technology and Applications XXIII
Bjorn F. Andresen; Marija Strojnik, Editor(s)

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