1Institute of Space and Astronautical Science (Japan) 2ACROTEC/Japan Energy Corp. (Japan) 3Clear Pulse Co., Ltd. (Japan) 4Hamamatsu Photonics KK (Japan)
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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.
Tadayuki Takahashi,Kazuyuki Hirose,Chiho Matsumoto,Kyoko Takizawa,Ryouichi Ohno,Tsutomu Ozaki,Kunishiro Mori, andYasuhiro 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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Tadayuki Takahashi, Kazuyuki Hirose, Chiho Matsumoto, Kyoko Takizawa, Ryouichi Ohno, Tsutomu Ozaki, Kunishiro Mori, 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