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Proceedings Paper

Proton irradiations of large-area Hg1-xCdxTe photovoltaic detectors for the cross-track infrared sounder
Author(s): Michael W. Kelly; E. J. Ringdahl; Arvind I. D'Souza; Scott D. Luce; E. W. Cascio
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Paper Abstract

The effect of radiation on HgCdTe photodiodes is an important parameter to understand when determining the long-term performance limitations for the Cross-track Infrared Sounder (CrIS), a Fourier Transform interferometric sensor that will fly as part of the National Polar-orbiting Operational Environmental Satellite System (NPOESS). The CrIS sensor uses relatively large area photovoltaic detectors, 1 mm in diameter. Each p-on-n HgCdTe photodiode consists of MBE grown, n-type material on lattice matched CdZnTe, with arsenic implantation used to form the junction. A 1mm diameter detector is achieved by using a lateral collection architecture. Solar, and trapped protons are a significant source of radiation in the NPOESS 833 km orbits. We irradiated 22 LWIR detectors with protons at the Harvard Cyclotron Laboratory (HCL) and monitored the I-V performance and dynamic impedance of each detector. Three groups of detectors were irradiated with either 44, 99, or 153-MeV protons, each between 1×1010 - 4×1012 p+/cm2. Several I-V data sets were collected within that fluence range at all three energies. All the detectors were warmed to room temperature for approximately 96 hours following the largest proton dose, re-cooled, and then re-characterized in terms of I-V performance and dynamic impedance. The total noise increase predicted for CrIS after 7-years in orbit is less than 1%.

Paper Details

Date Published: 23 January 2003
PDF: 12 pages
Proc. SPIE 4820, Infrared Technology and Applications XXVIII, (23 January 2003); doi: 10.1117/12.455821
Show Author Affiliations
Michael W. Kelly, MIT Lincoln Lab. (United States)
E. J. Ringdahl, MIT Lincoln Lab. (United States)
Arvind I. D'Souza, DRS Sensors & Targeting Systems (United States)
Scott D. Luce, ITT Industries, Inc. (United States)
E. W. Cascio, Harvard Univ. (United States)

Published in SPIE Proceedings Vol. 4820:
Infrared Technology and Applications XXVIII
Bjorn F. Andresen; Gabor F. Fulop; Marija Strojnik, Editor(s)

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