Development of an amorphous selenium based photoconductor and its application in a high-sensitivity photodetector
(Conference Presentation)

Tomoaki Masuzawa; Taishi Ebisudani; Jun Ochiai; Ichitaro Saito; Takatoshi Yamada; Daniel H. C. Chua; Hidenori Mimura; Ken Okano

doi:10.1117/12.2237545

2 November 2016 Development of an amorphous selenium based photoconductor and its application in a high-sensitivity photodetector (Conference Presentation)

Tomoaki Masuzawa, Taishi Ebisudani, Jun Ochiai, Ichitaro Saito, Takatoshi Yamada, Daniel H. C. Chua, Hidenori Mimura, Ken Okano

Author Affiliations +

Proceedings Volume 9957, Wide Bandgap Power Devices and Applications; 99570D (2016) https://doi.org/10.1117/12.2237545
Event: SPIE Optical Engineering + Applications, 2016, San Diego, California, United States

Abstract

Although present imaging devices are mostly silicon-based devices such as CMOS and CCD, these devices are reaching their sensitivity limit due to the band gap of silicon. Amorphous selenium (a-Se) is a promising candidate for high- sensitivity photo imaging devices, because of its low thermal noise, high spatial resolution, as well as adaptability to wide-area deposition. In addition, internal signal amplification is reported on a-Se based photodetectors, which enables a photodetector having effective quantum efficiency over 100 % against visible light. Since a-Se has sensitivity to UV and soft X-rays, the reported internal signal amplification should be applicable to UV and X-ray detection. However, application of the internal signal amplification required high voltage, which caused unexpected breakdown at the contact or thin-film transistor-based signal read-out. For this reason, vacuum devices having electron-beam read-out is proposed. The advantages of vacuum-type devices are vacuum insulation and its extremely low dark current. In this study, we present recent progresses in developing a-Se based photoconductive films and photodetector using nitrogen-doped diamond electron beam source as signal read-out. A novel electrochemical method is used to dope impurities into a-Se, turning the material from weak p-type to n-type. A p-n junction is formed within a-Se photoconductive film, which has increased the sensitivity of a-Se based photodetector. Our result suggests a possibility of high sensitivity photodetector that can potentially break the limit of silicon-based devices.

Conference Presentation

Citation Download Citation

Tomoaki Masuzawa, Taishi Ebisudani, Jun Ochiai, Ichitaro Saito, Takatoshi Yamada, Daniel H. C. Chua, Hidenori Mimura, and Ken Okano "Development of an amorphous selenium based photoconductor and its application in a high-sensitivity photodetector (Conference Presentation)", Proc. SPIE 9957, Wide Bandgap Power Devices and Applications, 99570D (2 November 2016); https://doi.org/10.1117/12.2237545

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

;

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
PRESENTATION

WATCH
PRESENTATION SAVE TO MY LIBRARY

GET CITATION

KEYWORDS

Photodetectors

Selenium

Silicon

Imaging devices

Photoresistors

Ultraviolet radiation

X-rays

Show All Keywords

Keywords/Phrases

Search In:

Publication Years