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

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6 Author(s)
Matsumoto, C. ; Inst. of Space & Astronaut. Sci., Sagamihara, Japan ; Takahashi, T. ; Takizawa, K. ; Ohno, R.
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We report a significant improvement of spectral properties of a cadmium telluride (CdTe) detector. This was accomplished via the use of a high quality CdTe crystal, where high Schottky barrier for the holes on a CdTe surface was formed by using a low work-function metal, indium. With a 2×2 mm2 detector at a thickness of 0.5 mm: the leakage current is measured to be 0.7 nA at room temperature (20°C) and below 1 pA at -70°C for 400 V bias voltage. The low leakage current allows us to operate the detector at a higher bias voltage than for previous CdTe detectors. The energy resolution we achieved at room temperature is 1.1-2.5 keV FWHM from the energy range of 2 keV to 150 keV at 20°C without any charge-loss correction electronics. At -70°C, we obtained an energy resolution of 1.0 keV FWHM at 122 keV and 2.1 keV FWHM at 662 keV

Published in:

Nuclear Science, IEEE Transactions on  (Volume:45 ,  Issue: 3 )

Date of Publication:

Jun 1998

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