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21 February 2007 Improvement in photoelectric conversion efficiency of red light in HARP film
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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.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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
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