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Amorphous-selenium (a-Se) based photodetector is a promising candidate for high sensitivity imaging device with high spatial resolution, high response speed, and a wide detection wave range. Although HARP (high-gain avalanche rushing amorphous photoconductor) is known to be the first a-Se based photodetector that reported carrier multiplication and achieved effective quantum efficiency of 10, physical...
In this study, key conditions of a carrier multiplication in amorphous selenium (a-Se) films were discussed in order to increase a sensitivity of vacuum tube photodetectors. The structural and electronic properties were analyzed for a-Se films with different structure and composition. This study will open up the possibility of developing new photodetectors, such as low-dose x-ray diagnosis systems...
We have been focusing on fabricating a photodetector that consists of a diamond cold cathode and an amorphous selenium (a-Se) photoconductor, which is one of the practical applications of a cold cathode. We have previously succeeded in achieving a proto-type photodetector of which a heavily nitrogen (N)-doped diamond was used as the cold cathode, and the results indeed showed a low operation voltage...
In this paper, a) a-Se, b) lightly As doped a-Se and c) heavily As doped a-Se films were fabricated by multi-layered vacuum evaporation method as introduced in previous report. To explain briefly, Se and As 2Se3 were charged into the boat as the evaporation source and the sample holder rotates on top of both sources to create a multi-layered film. A slit was introduced on top of the As2Se 3 to limit...
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