Title :
Improvement of the CdTe diode detectors using a guard-ring electrode
Author :
Nakazawa, Kazuhiro ; Oonuki, Kousuke ; Tanaka, Takaaki ; Kobayashi, Yoshihito ; Tamura, Ken´ichi ; Mitani, Takefumi ; Sato, Goro ; Watanabe, Shin ; Takahashi, Tadayuki ; Ohno, Ryoichi ; Kitajima, Akihito ; Kuroda, Yoshikatsu ; Onishi, Mitsunobu
Author_Institution :
Inst. of Space & Astronaut. Sci./JAXA, Kanagawa, Japan
Abstract :
Recent results from the Schottky CdTe diode detectors employing a guard-ring (GR) electrode are reported. A cathode electrode, made of platinum, was separated into an active electrode(s) and a surrounding GR. Typical leakage current of a device with active area of 2 × 2 mm2 and 0.5 mm thickness surrounded by a GR, is 7 and 20 pA at a bias of 100 and 500 V, respectively, operated at 20°C. Spectral resolution of this device is 0.93 and 1.2 keV (FWHM) at 59.5 and 122 keV, respectively, operated at 20°C with a bias of 800 V. Detailed study of the characteristics of these devices working as a gamma-ray detector is presented.
Keywords :
gamma-ray detection; leakage currents; semiconductor counters; 0.5 mm; 100 V; 2 m; 20 C; 500 V; 800 V; FWHM; Schottky CdTe diode detector; active area; active electrode; bias voltage; cadmium telluride detector; cathode electrode; gamma-ray detector; guard-ring electrode; leakage current; platinum electrode; spectral resolution; Anodes; Cathodes; Electrodes; Envelope detectors; Gamma ray detectors; Leakage current; Schottky diodes; Tail; Temperature; Voltage;
Journal_Title :
Nuclear Science, IEEE Transactions on
DOI :
10.1109/TNS.2004.832684
