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

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

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.

Citation Download Citation

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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