Heat treatment to suppress image defect occurrence in amorphous selenium avalanche multiplication photoconductive film with improved red-light sensitivity

Yuji Ohkawa; Kazunori Miyakawa; Tomoki Matsubara; Kenji Kikuchi; Shirou Suzuki; Kenkichi Tanioka; Misao Kubota; Norifumi Egami; Akira Kobayashi

doi:10.1587/elex.6.1118

LETTER

Heat treatment to suppress image defect occurrence in amorphous selenium avalanche multiplication photoconductive film with improved red-light sensitivity

Yuji Ohkawa, Kazunori Miyakawa, Tomoki Matsubara, Kenji Kikuchi, Shirou Suzuki, Kenkichi Tanioka, Misao Kubota, Norifumi Egami, Akira Kobayashi

Author information

Yuji Ohkawa
Materials Science & Advanced Devices, NHK Science & Technical Research Laboratories
Graduate School of Science and Technology, Shizuoka University
Kazunori Miyakawa
Advanced Research and Development Division, NHK ENGINEERING SERVICES, INC.
Tomoki Matsubara
Materials Science & Advanced Devices, NHK Science & Technical Research Laboratories
Kenji Kikuchi
Materials Science & Advanced Devices, NHK Science & Technical Research Laboratories
Shirou Suzuki
Materials Science & Advanced Devices, NHK Science & Technical Research Laboratories
Kenkichi Tanioka
Materials Science & Advanced Devices, NHK Science & Technical Research Laboratories
Misao Kubota
Materials Science & Advanced Devices, NHK Science & Technical Research Laboratories
Norifumi Egami
Materials Science & Advanced Devices, NHK Science & Technical Research Laboratories
Akira Kobayashi
Department 9, Electron Tube Division, Hamamatsu Photonics K.K.

Keywords: selenium, photoconductive film, HARP, avalanche multiplication

JOURNAL FREE ACCESS

2009 Volume 6 Issue 15 Pages 1118-1124

DOI https://doi.org/10.1587/elex.6.1118

Details

Abstract

Amorphous selenium (a-Se) avalanche multiplication photoconductive film, HARP film, has been developed for the purpose of making a high sensitivity video camera. HARP film used for the red channel in a color camera is doped with tellurium (Te) to improve its red-light sensitivity. However, doping a-Se with Te causes impurity levels that trap electrons, and the built-in-field from the trapped electrons causes image defects when a camera using the film is shooting intense spotlights. A heat treatment to suppress the defect occurrence was found. We describe this treatment and discuss its mechanism.

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