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Proceedings Paper

Improvement of the quantum efficiency of the new super-HARP image sensor
Author(s): Yuji Ohkawa; Kazunori Miyakawa; Shiro Suzuki; Tamotsu Takahata; Nobuo Saito; Norifumi Egami; Kenkichi Tanioka; Kouichi Ogusu; Akira Kobayashi; Tadaaki Hirai
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Paper Abstract

The New Super-HARP image sensor, which relies on avalanche multiplication in a photoconductive film made mainly of amorphous selenium, is ultra-high sensitive. The sensor has already ben used to film very dark scenes, however in such a situation, shot noise due to the quantum characteristics of light becomes a serious problem. Increasing the quantum efficiency of the image sensors can reduce shot noise. The quantum efficiency of the New Super-HARP sensor has been improved to obtain an even better picture. To increase the quantum efficiency for green incident-light two improvements have been made to the amorphous selenium film. The first is doping the film with a suitable amount of tellurium on its incident-light side. The sensor is reducing the lithium- fluoride-doped layer to about 60 percent of the thickness of the conventional film. The improved version of the New Super-HARP Film has higher quantum efficiency. Its quantum efficiency at a wavelength of 540 nm was evaluated to be double that of the conventional film. Shot noise is reduced by three dB, that is, the S/N is improved by three dB.

Paper Details

Date Published: 15 May 2001
PDF: 9 pages
Proc. SPIE 4306, Sensors and Camera Systems for Scientific, Industrial, and Digital Photography Applications II, (15 May 2001); doi: 10.1117/12.426954
Show Author Affiliations
Yuji Ohkawa, NHK Science and Technical Research Labs. (Japan)
Kazunori Miyakawa, NHK Science and Technical Research Labs. (Japan)
Shiro Suzuki, NHK Science and Technical Research Labs. (Japan)
Tamotsu Takahata, NHK Science and Technical Research Labs. (Japan)
Nobuo Saito, NHK Science and Technical Research Labs. (Japan)
Norifumi Egami, NHK Science and Technical Research Labs. (Japan)
Kenkichi Tanioka, NHK Science and Technical Research Labs. (Japan)
Kouichi Ogusu, Hamamatsu Photonics K.K. (Japan)
Akira Kobayashi, Hamamatsu Photonics K.K. (Japan)
Tadaaki Hirai, Hamamatsu Photonics K.K. (Japan)


Published in SPIE Proceedings Vol. 4306:
Sensors and Camera Systems for Scientific, Industrial, and Digital Photography Applications II
Nitin Sampat; Morley M. Blouke; John Canosa; John Canosa; Nitin Sampat, Editor(s)

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