An analysis of gamma radiation effects on ZnS- and CdTe-passivated HgCdTe photodiodes

Min Yung Lee; Young Ho Kim; Nam Ho Lee; Yong Soo Lee; Siva Sivananthan; Hee Chul Lee

doi:10.1117/12.665500

18 May 2006 An analysis of gamma radiation effects on ZnS- and CdTe-passivated HgCdTe photodiodes

Min Yung Lee, Young Ho Kim, Nam Ho Lee, Yong Soo Lee, Siva Sivananthan, Hee Chul Lee

Proceedings Volume 6206, Infrared Technology and Applications XXXII; 62062J (2006) https://doi.org/10.1117/12.665500
Event: Defense and Security Symposium, 2006, Orlando (Kissimmee), Florida, United States

Abstract

At present, infrared photodetectors are being increasingly used in space systems, where they are exposed to the space radiation environment. Consequently, the radiation-hardness-related problem in HgCdTe photodetectors has become a critical issue. In this study, the gamma radiation effects on ZnS- and CdTe-passivated mid-wavelength infrared (MWIR) HgCdTe photodiodes were investigated. Although ZnS has an excellent insulating property, its radiation-tolerant property was revealed very poor in comparison with CdTe. After 1 Mrad of gamma irradiation, the resistance-area product at zero bias (R₀A) value of the ZnS-passivated photodiode was drastically reduced by roughly 5 orders from ~10⁷ Ω cm² to 10² Ω cm², whereas the CdTe-passivated photodiode showed no degradation in R₀A values.

Citation Download Citation

Min Yung Lee, Young Ho Kim, Nam Ho Lee, Yong Soo Lee, Siva Sivananthan, and Hee Chul Lee "An analysis of gamma radiation effects on ZnS- and CdTe-passivated HgCdTe photodiodes", Proc. SPIE 6206, Infrared Technology and Applications XXXII, 62062J (18 May 2006); https://doi.org/10.1117/12.665500

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