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Proceedings Paper

128 x 128 PACE-I HgCdTe hybrid FPAs for thermoelectrically cooled applications
Author(s): Lester J. Kozlowski; S. L. Johnston; William V. McLevige; A. H.B. Vanderwyck; Donald E. Cooper; Scott A. Cabelli; Edward R. Blazejewski; Kadri Vural; William E. Tennant
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Paper Abstract

Staring 128 X 128 hybrid HgCdTe FPAs have been demonstrated with very good sensitivity and operability at temperatures compatible with thermoelectric cooling (> 160 K). The FPAs consist of HgCdTe/sapphire (PACE-I; producible alternative to CdTe for epitaxy) detector arrays hybridized to a CMOS readout having a gate modulation input circuit. FPAs with SWIR (2.5 micrometers at 78 K) and MWIR (4.56 micrometers at 180 K) cutoff wavelengths ((lambda) co) were made and evaluated. The SWIR arrays were ZnS passivated; the MWIR arrays were CdTe-passivated. Though the (lambda) co of the MWIR devices was not specifically optimized for terrestrial imaging at TE-cooled temperatures in the preferred 3.4 to 4.1 micrometers band, very good sensitivity was achieved, particularly relative to other technologies at temperatures >= 120 K. Mean laboratory noise equivalent temperature differences (NE(Delta) T) at 120 K, 170 K, and 180 K were 0.0048 K, 0.053 K, and 0.061 K respectively, for the MWIR device. While the NE(Delta) T was measured without a spectral filter, the sensitivity for 3.4 to 4.1 micrometers bandpass extrapolates to camera NE(Delta) T <EQ 0.05 K, if f/1.5 or faster optics are used. Near BLIP Detectivity (D*) of 1.62 X 1013 cm-Hz1/2/W and mean NE(Delta) T of 0.04 K were measured on the SWIR hybrid at 22.5 msec integration time and operating temperatures <EQ 162 K. Imagery of corresponding quality was subsequently generated. Since the CMOS multiplexer dissipates little power and needs a minimum of support circuitry, a viable thermoelectrically cooled FPA technology is implied.

Paper Details

Date Published: 1 September 1992
PDF: 12 pages
Proc. SPIE 1685, Infrared Detectors and Focal Plane Arrays II, (1 September 1992); doi: 10.1117/12.137796
Show Author Affiliations
Lester J. Kozlowski, Rockwell International Science Ctr. (United States)
S. L. Johnston, Rockwell International Science Ctr. (United States)
William V. McLevige, Rockwell International Science Ctr. (United States)
A. H.B. Vanderwyck, Rockwell International Science Ctr. (United States)
Donald E. Cooper, Rockwell International Science Ctr. (United States)
Scott A. Cabelli, Rockwell International Science Ctr. (United States)
Edward R. Blazejewski, Rockwell International Science Ctr. (United States)
Kadri Vural, Rockwell International Science Ctr. (United States)
William E. Tennant, Rockwell International Science Ctr. (United States)


Published in SPIE Proceedings Vol. 1685:
Infrared Detectors and Focal Plane Arrays II
Eustace L. Dereniak; Robert E. Sampson, Editor(s)

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