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Proceedings Paper

High-operability VLWIR array via interdigitated pixel utilization
Author(s): Arvind I. D'Souza; Maryn G. Stapelbroek; Larry C. Dawson; Dale E. Molyneux
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Paper Abstract

The interdigitation concept demonstration utilized lc[60 K] ~ 15 &mgr;m HgCdTe pixels in a 96 × 96 array format. Each pixel consisted of four interdigitated sub-pixels. Electronic circuitry on the ROIC deselects defective sub-pixels. High detector response is maintained across the pixel, even if one or two interdigitated sub-pixels are deselected, because interdigitation provides that the predominance of minority carriers photogenerated in the pixel is collected by the selected sub-pixels. An interdigitated sub-pixel is deselected where there is a short in at least one of the detectors of the sub-pixel. The configuration of the interdigitated sub-pixels for a pixel is selected such that photogenerated charge carriers generated anywhere within the pixel would be collected by any adjacent, interdigitated sub-pixels within the same pixel that are not deselected because the diffusion length for the charge carriers is long enough. Deselected interdigitated sub-pixels are disconnected so that no charge will be collected on deselected sub-pixels. Therefore, only detectors of adjacent selected interdigitated sub-pixels collect substantially all of the photogenerated charges corresponding to the impinging radiation. Photoresponse modeling of the interdigitated subpixel approach was performed. An example is that for a 20 &mgr;m diffusion length, the calculated QE changed from 85 % with 0 sub-pixels deselected, to 78 % with 1 sub-pixel, 67 % with two sub-pixels and 48 % with three sub-pixels deselected. A good comparison has been obtained between modeled and measured performance as a function of sub-pixel deselect.

Paper Details

Date Published: 1 May 2008
PDF: 7 pages
Proc. SPIE 6940, Infrared Technology and Applications XXXIV, 69403D (1 May 2008); doi: 10.1117/12.778266
Show Author Affiliations
Arvind I. D'Souza, DRS Sensors & Targeting Systems, Inc. (United States)
Maryn G. Stapelbroek, DRS Sensors & Targeting Systems, Inc. (United States)
Larry C. Dawson, DRS Sensors & Targeting Systems, Inc. (United States)
Dale E. Molyneux, DRS Sensors & Targeting Systems, Inc. (United States)

Published in SPIE Proceedings Vol. 6940:
Infrared Technology and Applications XXXIV
Bjørn F. Andresen; Gabor F. Fulop; Paul R. Norton, Editor(s)

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