Abstract
We describe the recent progress on the use of Schottky CdTe diode detectors for gamma-ray spectroscopy. The extremely low leakage current of the newly developed CdTe diode allows us to apply a much higher bias voltage in comparison with the previous CdTe detectors. Both the improved charge-collection eciency and the low leakage current lead to a good energy resolution even at room temperature. Largearea CdTe diode detectors with dimensions of 21:5 £ 21:5 mm 2 are now available. By stacking 40 layers of these large-area devices, we have achieved a good energy resolution of several keV (FWHM) for MeV gamma-rays.
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