Performance of a new Schottky CdTe detector for hard x-ray spectroscopy
- Inst. of Space and Astronautical Science, Kanagawa (Japan)
- Japan Energy Corp., Saitama (Japan)
- CLEAR-PULSE Co., Ltd., Tokyo (Japan)
The authors 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 x 2 mm{sup 2} 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 {minus} 70 C for 400 V bias voltage. The low leakage current allows one to operate the detector at a higher bias voltage than for previous CdTe detectors. The energy resolution they 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 {minus} 70 C, they obtained an energy resolution of 1.0 keV FWHM at 122 keV and 2.1 keV FWHM at 662 keV.
- OSTI ID:
- 624162
- Report Number(s):
- CONF-971147--
- Journal Information:
- IEEE Transactions on Nuclear Science, Journal Name: IEEE Transactions on Nuclear Science Journal Issue: 3Pt1 Vol. 45; ISSN 0018-9499; ISSN IETNAE
- Country of Publication:
- United States
- Language:
- English
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