30 September 2016 Thermal conductivity studies of CdZnTe with varying Te excess
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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.
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Maxx Jackson, Maxx Jackson, Brittany Bennett, Brittany Bennett, Dustin Giltnane, Dustin Giltnane, Stephen Babalola, Stephen Babalola, Martin F. Ohmes, Martin F. Ohmes, A. C. Stowe, 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); doi: 10.1117/12.2237822; https://doi.org/10.1117/12.2237822
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