Design of materials for IR detectors using high Z elements for high energy radiation environment

Sonali Saraf; Christopher Cooper; Ching Hua Su; Fow-Sen Choa; Bradley Arnold; Brian Cullum; David Sachs; Philip DiPaula; N. B. Singh

doi:10.1117/12.2516048

13 May 2019 Design of materials for IR detectors using high Z elements for high energy radiation environment

Sonali Saraf, Christopher Cooper, Ching Hua Su, Fow-Sen Choa, Bradley Arnold, Brian Cullum, David Sachs, Philip DiPaula , N. B. Singh

Author Affiliations +

Proceedings Volume 10980, Image Sensing Technologies: Materials, Devices, Systems, and Applications VI; 109801A (2019) https://doi.org/10.1117/12.2516048
Event: SPIE Defense + Commercial Sensing, 2019, Baltimore, MD, United States

Abstract

There is a strong need for rad hard and high operating temperature IR detectors for space environment. Heavy metal Selenides (high Z and large density) have been investigated for more than half century for high operating temperature mid wave infrared (MWIR) applications. Most of the efforts have been devoted to make detector arrays on high-resistivity Si substrates for operating wavelengths in the 1.5 to 5.0 μm region using physical vapor transport grown poly crystalline materials. For most of the biological spectral and imaging applications, short wave infrared (SWIR) detectors have shown better performance. Recent growth materials have shown variation in morphology with slight change in growth conditions and hence variation in performance parameters such as bandgap, mobility and resistivity from sample to sample. We have performed growth and optical characterization of binary materials CdSe-PbSe to determine the suitability for IR detector. We have determined bandgap using several theoretical models for different morphologies observed during growth on silicon wafers.

Citation Download Citation

Sonali Saraf, Christopher Cooper, Ching Hua Su, Fow-Sen Choa, Bradley Arnold, Brian Cullum, David Sachs, Philip DiPaula , and N. B. Singh "Design of materials for IR detectors using high Z elements for high energy radiation environment ", Proc. SPIE 10980, Image Sensing Technologies: Materials, Devices, Systems, and Applications VI, 109801A (13 May 2019); https://doi.org/10.1117/12.2516048

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