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Sensors 2013, 13(10), 13744-13778; doi:10.3390/s131013744

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

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1 Department of Material Science, International Christian University, 181-8585 Tokyo, Japan 2 Nanotube Research Center, National Institute of Advanced Industrial Science and Technology, 305-8565 Tsukuba, Japan 3 Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 980-8577 Sendai, Japan 4 Department of Materials Science & Engineering, National University of Singapore, 117574 Singapore, Singapore 5 Department of Electrical Engineering, Graduate School of Engineering, Osaka University, 565-0871 Osaka, Japan 6 Department of Clinical Laboratory, Faculty of Medicine, University of Tokyo, 113-8655 Tokyo, Japan
* Author to whom correspondence should be addressed.
Received: 19 August 2013 / Revised: 12 September 2013 / Accepted: 23 September 2013 / Published: 11 October 2013
(This article belongs to the Special Issue Photodetectors)


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.
Keywords: amorphous selenium; photodetector; carrier multiplication; diamond; cold cathode amorphous selenium; photodetector; carrier multiplication; diamond; cold cathode
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Masuzawa, T.; Saito, I.; Yamada, T.; Onishi, M.; Yamaguchi, H.; Suzuki, Y.; Oonuki, K.; Kato, N.; Ogawa, S.; Takakuwa, Y.; Koh, A.T.T.; Chua, D.H.C.; Mori, Y.; Shimosawa, T.; Okano, K. Development of an Amorphous Selenium-Based Photodetector Driven by a Diamond Cold Cathode. Sensors 2013, 13, 13744-13778.

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