Improvement in photoelectric conversion efficiency of red light in HARP film

Tomoki Matsubara; Yuji Ohkawa; Kazunori Miyakawa; Shirou Suzuki; Misao Kubota; Norifumi Egami; Kenkichi Tanioka; Kouichi Ogusu; Akira Kobayashi; Tadaaki Hirai; Toshiaki Kawai

doi:10.1117/12.703066

21 February 2007 Improvement in photoelectric conversion efficiency of red light in HARP film

Tomoki Matsubara, Yuji Ohkawa, Kazunori Miyakawa, Shirou Suzuki, Misao Kubota, Norifumi Egami, Kenkichi Tanioka, Kouichi Ogusu, Akira Kobayashi, Tadaaki Hirai, Toshiaki Kawai

Author Affiliations +

Proceedings Volume 6501, Sensors, Cameras, and Systems for Scientific/Industrial Applications VIII; 650108 (2007) https://doi.org/10.1117/12.703066
Event: Electronic Imaging 2007, 2007, San Jose, CA, United States

Abstract

We enhanced the photoelectric conversion efficiency of red light in a 15-&mgr;m-thick HARP film without deteriorating image pick-up characteristics or reliability. To achieve a higher photoelectric conversion efficiency for red light, we designed a new film structure with an increased amount of doped Te, which has a narrower band gap than that of a-Se. The thickness of the LiF-doped layer for trapping holes was increased from that of the conventional red-extended HARP film in order to weaken the internal field that would otherwise be enhanced by trapped electrons in extra doped Te. The new red-extended HARP film achieved a photoelectric conversion efficiency for red light of about 22.5% at a wavelength of 620 nm, which is twice that of the conventional red-extended film. We confirmed an improvement in signal to shot noise ratio of 3 dB and a dramatic improvement in color reproduction when we experimented with an HDTV camera with a camera tube incorporating the new film.

Citation Download Citation

Tomoki Matsubara, Yuji Ohkawa, Kazunori Miyakawa, Shirou Suzuki, Misao Kubota, Norifumi Egami, Kenkichi Tanioka, Kouichi Ogusu, Akira Kobayashi, Tadaaki Hirai, and Toshiaki Kawai "Improvement in photoelectric conversion efficiency of red light in HARP film", Proc. SPIE 6501, Sensors, Cameras, and Systems for Scientific/Industrial Applications VIII, 650108 (21 February 2007); https://doi.org/10.1117/12.703066

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