Development of a cadmium telluride pixel detector for astrophysical applications

Hiromasa Miyasaka, Fiona A. Harrison, Walter R. Cook, Peter H. Mao, Vikram R. Rana, Shin Nosuke Ishikawa, Masayoshi Ushio, Hiroyuki Aono, Shin Watanabe, Goro Sato, Motohide Kokubun, Tadayuki Takahashi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)


We are developing imaging Cadmium Telluride (CdTe) pixel detectors optimized for astrophysical hard X-ray applications. Our hybrid detector consist of a CdTe crystal 1mm thick and 2cm × 2cm in area with segmented anode contacts directly bonded to a custom low-noise application specific integrated circuit (ASIC). The CdTe sensor, fabricated by ACRORAD (Okinawa, Japan), has Schottky blocking contacts on a 605 micron pitch in a 32 × 32 array, providing low leakage current and enabling readout of the anode side. The detector is bonded using epoxy-gold stud interconnects to a custom low noise, low power ASIC circuit developed by Caltech's Space Radiation Laboratory. We have achieved very good energy resolution over a wide energy range (0.62keV FWHM @ 60keV, 10.8keV FWHM @ 662keV). We observe polarization effects at room temperature, but they are suppressed if we operate the detector at or below 0°C degree. These detectors have potential application for future missions such as the International X-ray Observatory (IXO).

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2009
EventUV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVI - San Diego, CA
Duration: 2009 Aug 32009 Aug 3


OtherUV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVI
CitySan Diego, CA


  • anode pixelated detector
  • ASIC
  • CdTe
  • hard X-ray astrophysics
  • International X-ray Observatory

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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