Thermal conductivity studies of CdZnTe with varying Te excess

Maxx Jackson; Brittany Bennett; Dustin Giltnane; Stephen Babalola; Martin F. Ohmes; A. C. Stowe

doi:10.1117/12.2237822

30 September 2016 Thermal conductivity studies of CdZnTe with varying Te excess

Maxx Jackson, Brittany Bennett, Dustin Giltnane, Stephen Babalola, Martin F. Ohmes, A. C. Stowe

Proceedings Volume 9968, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVIII; 99681E (2016) https://doi.org/10.1117/12.2237822
Event: SPIE Optical Engineering + Applications, 2016, San Diego, California, United States

Abstract

Cadmium Zine Telluride (CZT) has been extensively studied as a room temperature semiconductor gamma radiation detector. CZT continues to show promise as a bulk and pixelated gamma spectrometer with less than one percent energy resolution; however the fabrication costs are high. Improved yields of high quality, large CZT spectroscopy grade crystals must be achieved. CZT is grown by the Traveling Heater Method (THM) with a Te overpressure to account for vaporization losses. This procedure creates Te rich zones. During growth, boules will often cleave limiting the number of harvestable crystals. As a result, crystal growth parameter optimization was evaluated by modeling the heat flow within the system. Interestingly, Cadmium Telluride (CdTe) is used as a thermal conductivity surrogate in the absence of a thorough study of the CZT thermal properties. The current study has measured the thermal conductivity of CZT pressed powders with varying Te concentrations from 50-100% over 25-800°C to understand the variation in this parameter from CdTe. Cd0.9Zn0.1Te1.0 is the base CZT (designated 50%). CZT exhibits a thermal conductivity of nearly 1 W/mK, an order of magnitude greater than CdTe. Further, the thermal conductivity decreased with increasing Te concentration.

Citation Download Citation

Maxx Jackson, Brittany Bennett, Dustin Giltnane, Stephen Babalola, Martin F. Ohmes, and A. C. Stowe "Thermal conductivity studies of CdZnTe with varying Te excess", Proc. SPIE 9968, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVIII, 99681E (30 September 2016); https://doi.org/10.1117/12.2237822

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