Sensors (Oct 2013)

Development of an Amorphous Selenium-Based Photodetector Driven by a Diamond Cold Cathode

  • Tatsuo Shimosawa,
  • Ken Okano,
  • Yusuke Mori,
  • Angel T. T. Koh,
  • Daniel H. C. Chua,
  • Yuji Takakuwa,
  • Shuichi Ogawa,
  • Nanako Kato,
  • Kousuke Oonuki,
  • Yu Suzuki,
  • Hisato Yamaguchi,
  • Takatoshi Yamada,
  • Masanori Onishi,
  • Ichitaro Saito,
  • Tomoaki Masuzawa

DOI
https://doi.org/10.3390/s131013744
Journal volume & issue
Vol. 13, no. 10
pp. 13744 – 13778

Abstract

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Amorphous-selenium (a-Se) based photodetectors are promising candidates for imaging devices, due to their high spatial resolution and response speed, as well as extremely high sensitivity enhanced by an internal carrier multiplication. In addition, a-Se is reported to show sensitivity against wide variety of wavelengths, including visible, UV and X-ray, where a-Se based flat-panel X-ray detector was proposed. In order to develop an ultra high-sensitivity photodetector with a wide detectable wavelength range, a photodetector was fabricated using a-Se photoconductor and a nitrogen-doped diamond cold cathode. In the study, a prototype photodetector has been developed, and its response to visible and ultraviolet light are characterized.

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