Application of Organic Photodiodes to X-ray Measurements - A Feasibility Study

被引：2

作者：

Takada, Eiji ^{[1
]}

Takada, Akinari ^{[1
]}

Inoue, Akihiro ^{[1
]}

Imai, Hideyuki ^{[1
]}

Okada, Hiroyuki ^{[2
]}

Naka, Shigeki ^{[2
]}

Kawarabayashi, Jun ^{[3
]}

Nakamura, Takashi ^{[4
]}

Namito, Yoshihito ^{[5
]}

机构：

[1] Toyama Natl Coll Technol, 13 Hongo Machi, Toyama 9398630, Japan

[2] Toyama Univ, Toyama 9308555, Japan

[3] Nagoya Univ, Chikusa Ku, Nagoya, Aichi 4648603, Japan

[4] Tohoku Univ, Aoba Ku, Sendai, Miyagi 9808579, Japan

[5] High Energy Accelerator Res Org KEK, Tsukuba, Ibaraki 305, Japan

来源：

JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY | 2011年 / 48卷 / 08期

基金：

日本学术振兴会;

关键词：

organic photodiode (OPD); a-NPD; td-PTC; vapor deposition; X-ray; current; hetero; bulk hetero; efficiency; PHOTODETECTORS; DETECTORS; PROGRESS;

D O I：

10.3327/jnst.48.1140

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

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/alpha-NPD/td-PTC/Al with a sensing area of 4 x 4 mm(2), while OPD-c has a 300-nm-thick mixed organic layer between alpha-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.

引用

页码：1140 / 1145

页数：6

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