High-operability VLWIR array via interdigitated pixel utilization

Arvind I. D'Souza; Maryn G. Stapelbroek; Larry C. Dawson; Dale E. Molyneux

doi:10.1117/12.778266

1 May 2008 High-operability VLWIR array via interdigitated pixel utilization

Arvind I. D'Souza, Maryn G. Stapelbroek, Larry C. Dawson, Dale E. Molyneux

Proceedings Volume 6940, Infrared Technology and Applications XXXIV; 69403D (2008) https://doi.org/10.1117/12.778266
Event: SPIE Defense and Security Symposium, 2008, Orlando, Florida, United States

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.

Citation Download Citation

Arvind I. D'Souza, Maryn G. Stapelbroek, Larry C. Dawson, and Dale E. Molyneux "High-operability VLWIR array via interdigitated pixel utilization", Proc. SPIE 6940, Infrared Technology and Applications XXXIV, 69403D (1 May 2008); https://doi.org/10.1117/12.778266

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KEYWORDS

Sensors

Microlens

Quantum efficiency

Diffusion

Staring arrays

Monte Carlo methods

Mercury cadmium telluride

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