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Proceedings Paper

Prospects for large-format IR astronomy FPAs using MBE-grown HgCdTe detectors with cutoff wavelength > 4 um
Author(s): Robert B. Bailey; Jose M. Arias; William V. McLevige; John G. Pasko; Annie Chi-yi Chen; Craig A. Cabelli; Lester J. Kozlowski; Kadri Vural; Jian Wu; William J. Forrest; Judith L. Pipher
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Paper Abstract

Rockwell Science Center has developed a double layer planar heterostructure (DLPH) detector array fabrication process with significant advantages over the PACE-1 process now being used to produce 256 X 256 and 1024 X 1024 FPAs for low background IR astronomy. The DLPH detectors are p- on-n photodiodes fabricated in a double layer of wide and narrow bandgap HgCdTe grown by molecular beam epitaxy on CdZnTe substrates. The double layer structure provides superior surface passivation while the lattice matched CdZnTe substrate reduces the defect density. DLPH FPAs have been fabricated in array sizes up to 640 X 480 and with cutoff wavelengths as long as 15 micrometers . Quantum efficiencies are typically in the 0.5 to 0.8 range. For a 256 X 256 array DLPH detectors with 5.3 micrometers cutoff wavelength at 50K, the median dark current was 0.39 e-/sec at 0.5V reverse bias. For 7 of 17 individual DLPH detector with 10.6 micrometers cutoff at 30K, the dark current was less than 104 e-/sec at 20 mV bias. For long cutoff wavelengths, the detector breakdown voltage is too low to permit signal integration directly on the reverse biased detector capacitance. Such detectors require a readout circuit that maintains the detector near zero bias and provides a separate capacitor to store the integrated signal.

Paper Details

Date Published: 21 August 1998
PDF: 10 pages
Proc. SPIE 3354, Infrared Astronomical Instrumentation, (21 August 1998); doi: 10.1117/12.317331
Show Author Affiliations
Robert B. Bailey, Rockwell Science Ctr. (United States)
Jose M. Arias, Rockwell Science Ctr. (United States)
William V. McLevige, Rockwell Science Ctr. (United States)
John G. Pasko, Rockwell Science Ctr. (United States)
Annie Chi-yi Chen, Rockwell Science Ctr. (United States)
Craig A. Cabelli, Rockwell Science Ctr. (United States)
Lester J. Kozlowski, Rockwell Science Ctr. (United States)
Kadri Vural, Rockwell Science Ctr. (United States)
Jian Wu, Univ. of Rochester (United States)
William J. Forrest, Univ. of Rochester (United States)
Judith L. Pipher, Univ. of Rochester (United States)

Published in SPIE Proceedings Vol. 3354:
Infrared Astronomical Instrumentation
Albert M. Fowler, Editor(s)

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