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Proceedings Paper

Performance and modeling of the MWIR HgCdTe electron avalanche photodiode
Author(s): Jeffrey Beck; Richard Scritchfield; Billy Sullivan; Jamie Teherani; Chang-Feng Wan; Mike Kinch; Martha Ohlson; Mark Skokan; Lewis Wood; Pradip Mitra; Mike Goodwin; Jim Robinson
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Paper Abstract

The operation of the mid-wave infrared (MWIR) HgCdTe cylindrical electron injection avalanche photodiode (e-APD) is described. The measured gain and excess noise factor are related to the to the collection region fill factor. A 2D diffusion model calculates the time dependent response and steady state pixel point spread function for cylindrical diodes, and predicts bandwidths near 1 GHz for small geometries. A 2 μm diameter spot scan system was developed for point spread function and crosstalk measurements at 80 K. An electron diffusion length of 13.4 μm was extracted from spot scan data. Bandwidth data are shown that indicate bandwidths in excess of 300 MHz for small unit cells geometries. Dark current data, at high gain levels, indicate an effective gain normalized dark density count as low as 1000 counts per μs per cm2 at an APD gain of 444. A junction doping profile was determined from capacitance-voltage data. Spectral response data shows a gain independent characteristic.

Paper Details

Date Published: 7 May 2009
PDF: 17 pages
Proc. SPIE 7298, Infrared Technology and Applications XXXV, 729838 (7 May 2009); doi: 10.1117/12.819045
Show Author Affiliations
Jeffrey Beck, DRS Sensors & Targeting Systems, Inc. (United States)
Richard Scritchfield, DRS Sensors & Targeting Systems, Inc. (United States)
Billy Sullivan, DRS Sensors & Targeting Systems, Inc. (United States)
Jamie Teherani, DRS Sensors & Targeting Systems, Inc. (United States)
Chang-Feng Wan, DRS Sensors & Targeting Systems, Inc. (United States)
Mike Kinch, DRS Sensors & Targeting Systems, Inc. (United States)
Martha Ohlson, DRS Sensors & Targeting Systems, Inc. (United States)
Mark Skokan, DRS Sensors & Targeting Systems, Inc. (United States)
Lewis Wood, DRS Sensors & Targeting Systems, Inc. (United States)
Pradip Mitra, DRS Sensors & Targeting Systems, Inc. (United States)
Mike Goodwin, DRS Sensors & Targeting Systems, Inc. (United States)
Jim Robinson, DRS Sensors & Targeting Systems, Inc. (United States)


Published in SPIE Proceedings Vol. 7298:
Infrared Technology and Applications XXXV
Bjørn F. Andresen; Gabor F. Fulop; Paul R. Norton, Editor(s)

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