Proton irradiations of large-area Hg1-xCdxTe photovoltaic detectors for the cross-track infrared sounder

Michael W. Kelly; E. J. Ringdahl; Arvind I. D'Souza; Scott D. Luce; E. W. Cascio

doi:10.1117/12.455821

23 January 2003 Proton irradiations of large-area Hg_1-xCd_xTe photovoltaic detectors for the cross-track infrared sounder

Michael W. Kelly, E. J. Ringdahl, Arvind I. D'Souza, Scott D. Luce, E. W. Cascio

Author Affiliations +

Proceedings Volume 4820, Infrared Technology and Applications XXVIII; (2003) https://doi.org/10.1117/12.455821
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

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%.

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Michael W. Kelly, E. J. Ringdahl, Arvind I. D'Souza, Scott D. Luce, and E. W. Cascio "Proton irradiations of large-area Hg_1-xCd_xTe photovoltaic detectors for the cross-track infrared sounder", Proc. SPIE 4820, Infrared Technology and Applications XXVIII, (23 January 2003); https://doi.org/10.1117/12.455821

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