Surface treatments and their effects on the performance of Cd1-xZnxTe radiation detectors

Yunlong Cui; G. Wright; K. Kolokolnikov; C. Barnett; K. Reed; U. N. Roy; Arnold Burger; Ralph B. James

doi:10.1117/12.450751

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18 December 2001 Surface treatments and their effects on the performance of Cd_1-xZn_xTe radiation detectors

Yunlong Cui, G. Wright, K. Kolokolnikov, C. Barnett, K. Reed, U. N. Roy, Arnold Burger, Ralph B. James

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Proceedings Volume 4507, Hard X-Ray and Gamma-Ray Detector Physics III; (2001) https://doi.org/10.1117/12.450751
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

Detector grade, charge compensated Cd_1-xZn_xTe (CZT) crystals were treated by mechanical polishing, chemical solution etching, and radio-frequency gold sputtering. The crystals and detectors were next studied using direct current (DC) photoconductivity and low-temperature photoluminescence (PL). The DC photocurrent was analyzed with a steady state continuity equation and the results were correlated with PL and gamma-ray detector performance tests. The dependence of the electron lifetime on the light intensity of the CZT detector was consistent with a Shockley-Read one-center model. It was found that the surface recombination velocities, the effective mobility-lifetime products, and gamma-ray performances of CZT crystals are modified dramatically by the choice of chemical etchant.

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Yunlong Cui, G. Wright, K. Kolokolnikov, C. Barnett, K. Reed, U. N. Roy, Arnold Burger, and Ralph B. James "Surface treatments and their effects on the performance of Cd_1-xZn_xTe radiation detectors", Proc. SPIE 4507, Hard X-Ray and Gamma-Ray Detector Physics III, (18 December 2001); https://doi.org/10.1117/12.450751

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