Realizing photomultiplication-type organic photodetectors based on C60-doped bulk heterojunction structure at low bias

doi:10.1088/1674-1056/28/3/038501

中国物理B ›› 2019, Vol. 28 ›› Issue (3): 38501-038501.doi: 10.1088/1674-1056/28/3/038501

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇下一篇

Realizing photomultiplication-type organic photodetectors based on C₆₀-doped bulk heterojunction structure at low bias

Wei Gong(龚伟), Tao An(安涛), Xinying Liu(刘欣颖), Gang Lu(卢刚)

Department of Electronic Engineering, Xi'an University of Technology, Xi'an 710048, China

收稿日期:2018-09-15 修回日期:2018-11-20 出版日期:2019-03-05 发布日期:2019-03-05
通讯作者: Tao An E-mail:antao@xaut.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 61106043), the Natural Science Foundation of Shaanxi Province, China (Grant No. 2015JM6267), and Program of Xi'an University of Technology, China (Grant No. 103-4515013).

Realizing photomultiplication-type organic photodetectors based on C₆₀-doped bulk heterojunction structure at low bias

Wei Gong(龚伟), Tao An(安涛), Xinying Liu(刘欣颖), Gang Lu(卢刚)

Department of Electronic Engineering, Xi'an University of Technology, Xi'an 710048, China

Received:2018-09-15 Revised:2018-11-20 Online:2019-03-05 Published:2019-03-05
Contact: Tao An E-mail:antao@xaut.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 61106043), the Natural Science Foundation of Shaanxi Province, China (Grant No. 2015JM6267), and Program of Xi'an University of Technology, China (Grant No. 103-4515013).

摘要/Abstract

摘要：

Photomultiplication (PM) structure has been widely employed to improve the optoelectronic performance of organic photodetectors (OPDs). However, most PM-type OPDs require a high negative operating voltage or complex fabrication. For obtaining high-efficiency OPDs with low voltage and easy process, here the bulk heterojunction (BHJ) structure of high exciton dissociation efficiency combined with the method of trap-assisted PM are applied to the OPDs. In this paper, we investigate the operating mechanism of OPDs based on poly(3-hexylthiophene) (P3HT):(phenyl-C61-butyric-acid-methyl-ester) (PC₆₁BM), and poly-{[4,8-bis[(2-ethylhexyl)oxy]-benzo[1,2-b:4,5-b]dithiophene-2,6-diyl]-alt-[3-fluore-2-(octyloxy)carbonyl-thieno[3,4-b]thiophene-4,6-diyl]} (PBDT-TT-F):PC₆₁BM doped with C₆₀ as active layer. Furthermore, the influence of C₆₀ concentration on the optoelectronic performances is also discussed. With 1.6 wt.% C₆₀ added, the P3HT:PC₆₁BM:C₆₀ OPD exhibits a 327.5% external quantum efficiency, a 1.21 A·W^-1 responsivity, and a 4.22×10¹² Jones normalized detectivity at -1 V under 460 nm (0.21 mW·cm^-2) illumination. The experimental results show that the effective electron traps can be formed by doping a small weight of C₆₀ into BHJ active layer. Thus the PM-type OPDs can be realized, which benefits from the cathode hole tunneling injection assisted by the trapped electrons in C₆₀ near the Al side. The efficiency of PM is related to the C₆₀ concentration. The present study provides theoretical basis and method for the design of highly sensitive OPDs with low operating voltage and facile fabrication.

关键词: organic photodetector, photomultiplication, electron trap, space charge, tunneling effect

Abstract:

Key words: organic photodetector, photomultiplication, electron trap, space charge, tunneling effect

中图分类号: (Photodetectors (including infrared and CCD detectors))

85.60.Gz

85.60.Ha (Photomultipliers; phototubes and photocathodes) 78.66.Qn (Polymers; organic compounds) 73.40.Lq (Other semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions)

龚伟, 安涛, 刘欣颖, 卢刚. Realizing photomultiplication-type organic photodetectors based on C₆₀-doped bulk heterojunction structure at low bias[J]. 中国物理B, 2019, 28(3): 38501-038501.

Wei Gong(龚伟), Tao An(安涛), Xinying Liu(刘欣颖), Gang Lu(卢刚). Realizing photomultiplication-type organic photodetectors based on C₆₀-doped bulk heterojunction structure at low bias[J]. Chin. Phys. B, 2019, 28(3): 38501-038501.

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Realizing photomultiplication-type organic photodetectors based on C₆₀-doped bulk heterojunction structure at low bias

Realizing photomultiplication-type organic photodetectors based on C₆₀-doped bulk heterojunction structure at low bias

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