Performance of a new Schottky CdTe detector for hard x-ray spectroscopy

Tadayuki Takahashi; Kazuyuki Hirose; Chiho Matsumoto; Kyoko Takizawa; Ryouichi Ohno; Tsutomu Ozaki; Kunishiro Mori; Yasuhiro Tomita

doi:10.1117/12.312900

1 July 1998 Performance of a new Schottky CdTe detector for hard x-ray spectroscopy

Tadayuki Takahashi, Kazuyuki Hirose, Chiho Matsumoto, Kyoko Takizawa, Ryouichi Ohno, Tsutomu Ozaki, Kunishiro Mori, Yasuhiro Tomita

Author Affiliations +

Proceedings Volume 3446, Hard X-Ray and Gamma-Ray Detector Physics and Applications; (1998) https://doi.org/10.1117/12.312900
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

We report a significant improvement of the spectral properties of a cadmium telluride (CdTe) detector. With the use of a high quality CdTe crystal, we formed a high Schottky barrier for the holes on a CdTe surface using a low work-function metal, indium. For a 2 X 2 mm² detector with a thickness of 0.5 mm the leakage current was measured to be 0.7 nA at room temperature (20 degree(s)C) and 10 pA at -20 degree(s)C for a 400 V bias voltage. The low-leakage current of the detector allows us to operate the detector at a higher bias voltage than previous CdTe detectors. The improved charge collection efficiency and the low-leakage current leads to an energy resolution of 1.1 - 2.5 keV FWHM in the energy range 2 keV to 150 keV at 20 degree(s)C without charge loss correction electronics. We confirmed that once a high electric field of several kV/cm is applied, the Schottky CdTe has a very good energy resolution as well as sufficient stability to be used for practical applications.

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Tadayuki Takahashi, Kazuyuki Hirose, Chiho Matsumoto, Kyoko Takizawa, Ryouichi Ohno, Tsutomu Ozaki, Kunishiro Mori, and Yasuhiro Tomita "Performance of a new Schottky CdTe detector for hard x-ray spectroscopy", Proc. SPIE 3446, Hard X-Ray and Gamma-Ray Detector Physics and Applications, (1 July 1998); https://doi.org/10.1117/12.312900

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