Application of Organic Photodiodes to X-ray Measurements — A Feasibility Study
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概要
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To elucidate the applicability of organic photodiodes (OPDs) to radiation measurements, three OPDs were fabricated, two with heterojunction structures (OPD-a and OPD-b) and one with a bulk-heterojunction structure (OPD-c). OPD-a and OPD-b have a structure of ITO/α-NPD/td-PTC/Al with a sensing area of 4×4 mm2, while OPD-c has a 300-nm-thick mixed organic layer between α-NPD and td-PTC layers. All three OPDs showed rectifying properties under forward and reverse voltages. X-ray irradiation experiments have been carried out with these OPD devices. Results revealed that X-rays increased the output current, although some problems persisted, such as low photon-to-current conversion efficiency. When irradiating OPD-a and OPD-b with mono-energy X-rays at 20 keV, the current increased to about 6 pA from about 0.5 pA under dark conditions. The X-ray-induced current increased concomitantly with increasing X-ray intensity with some nonlinearity. Measurements of X-ray-induced current with OPD-c showed that it could yield a higher X-ray-induced current than those observed from OPD-a and OPD-b.
- 一般社団法人 日本原子力学会の論文
著者
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Inoue Akihiro
Toyama National College Of Technology
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Takada Eiji
Toyama National College Of Technology
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Kawarabayashi Jun
Nagoya University
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Imai Hideyuki
Toyama National College Of Technology
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NAMITO Yoshihito
High Energy Accel. Res. Org.
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TAKADA Akinari
Toyama National College of Technology
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OKADA Hiroyuki
University of Toyama
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NAKA Shigeki
University of Toyama
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NAKAMURA Takashi
Tohoku University
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