Improvement of the CdTe diode detectors using a guard-ring electrode

Kazuhiro Nakazawa*, Kousuke Oonuki, Takaaki Tanaka, Yoshihito Kobayashi, Ken'ichi Tamura, Takefumi Mitani, Goro Sato, Shin Watanabe, Tadayuki Takahashi, Ryoichi Ohno, Akihito Kitajima, Yoshikatsu Kuroda, Mitsunobu Onishi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

69 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)1881-1885
Number of pages5
JournalIEEE Transactions on Nuclear Science
Issue number4 I
Publication statusPublished - 2004 Aug


  • Cadmium telluride (CdTe)
  • Diode
  • Gamma-ray
  • Guard-ring (GR)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Nuclear Energy and Engineering


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