progress on the use of Schottky CdTe diode detectors
for spectrometry. The low leakage current of the CdTe diode allows
us to apply a much higher bias voltage than was possible with previous
CdTe detectors. For a relatively thin detector of 0.5–1 mm thick, the high
bias voltage results in a high electric field in the device. Both the improved
charge collection efficiency and the low-leakage current lead to an energy
resolution of better than 600 eV FWHM at 60 keV for a 2
2 mm✁
device
without any charge-loss correction electronics. Large area detectors with
dimensions of 21
21 mm✁
are now available with an energy resolution of ✂
2.8 keV. Long term stability can be easily attained for relatively thin (✄ 1
mm) detectors, if they are cooled or operated under a high bias voltage.
Keywords—CdTe, CdZnTe, Pixel Detector, Gamma-ray, X-ray
progress on the use of Schottky CdTe diode detectorsfor spectrometry. The low leakage current of the CdTe diode allowsus to apply a much higher bias voltage than was possible with previousCdTe detectors. For a relatively thin detector of 0.5–1 mm thick, the highbias voltage results in a high electric field in the device. Both the improvedcharge collection efficiency and the low-leakage current lead to an energyresolution of better than 600 eV FWHM at 60 keV for a 22 mm✁devicewithout any charge-loss correction electronics. Large area detectors withdimensions of 2121 mm✁are now available with an energy resolution of ✂2.8 keV. Long term stability can be easily attained for relatively thin (✄ 1mm) detectors, if they are cooled or operated under a high bias voltage.Keywords—CdTe, CdZnTe, Pixel Detector, Gamma-ray, X-ray
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