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DOE OSTI · 2336582

Improving CdMnTe Detector Performance by Adding 2% of Selenium

Kim, Kihyun·Bolotnikov, Aleksey E.·James, Ralph B.
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Abstract

About 2% of selenium was added to CdMnTe (CMT) to reveal the role of selenium in CMT material used as a gamma-ray detector. The average etch-pit density (EPD) in a typical 2-in CdMnTeSe (CMTS) wafer was measured to be about 8.3×10 3 cm –2 except for the edge regions, and the radial nonuniformity of the bandgap along the wafer was about 2-meV. The typical mobility-lifetime product of electrons and holes was evaluated to be 3.06×10 –3 cm 2 /V and 3.1×10 –4 cm 2 /V, respectively. The energy resolution of the 122-keV photo-peak for a Co-57 radioactive source with a planar CMTS detector was 5.2%, demonstrating a positive effect associated with adding dilute amounts of Se to CMT. Finally, the enhanced detector performance in a planar CMTS detector is attributed to an improved value of hole mobility-lifetime product in CMTS, which mitigates the adverse hole tailing effect found in CdZnTe (CZT) and CMT detectors.

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47 OTHER INSTRUMENTATIONCadmium compoundsCdMnTe (CMT)CdMnTeSe (CMTS)Detectorscurrent-voltage characteristicselectron mobilityetch-pit density (EPD)gamma-ray detectorsmanganesephotonic band gappulse height spectraseleniumselenium dopingsemiconductor X-ray and gamma-ray detectors

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Kim, Kihyun, Bolotnikov, Aleksey E., James, Ralph B.. 2024-01-18. Improving CdMnTe Detector Performance by Adding 2% of Selenium. https://doi.org/10.1109/tns.2024.3355760

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