Effect of compositions of acceptor polymers on dark current and photocurrent of all-polymer bulk-heterojunction photodetectors

被引：15
作者：
Hu, Liuyong [1 ,2 ]
Qiao, Wenqiang [1 ]
Zhou, Xiaokang [1 ,2 ]
Zhang, Xiaoqin [1 ,2 ]
Ma, Dongge [1 ]
Li, Yuning [3 ,4 ]
Wang, Zhi Yuan [1 ,5 ]
机构：
[1] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Univ Waterloo, Dept Chem Engn, 200 Univ Ave West, Waterloo, ON N2L 3G1, Canada
[4] Univ Waterloo, Waterloo Inst Nanotechnol, 200 Univ Ave West, Waterloo, ON N2L 3G1, Canada
[5] Carleton Univ, Dept Chem, 1125 Colonel By Dr, Ottawa, ON K1S 5B6, Canada
来源：
POLYMER | 2017年 / 114卷
基金：
中国国家自然科学基金;
关键词：
Electron acceptor copolymers; Acceptor polymer blend; All-polymer photodetector; Dark current; Photocurrent; ORGANIC SOLAR-CELLS; POWER CONVERSION EFFICIENCY; CONJUGATED POLYMERS; SPECTRAL RESPONSE; BROAD-RESPONSE; FIBRIL WIDTH; PERFORMANCE; DONOR; DIKETOPYRROLOPYRROLE; FULLERENE;
D O I：
10.1016/j.polymer.2017.02.060
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
A series of electron-acceptor polymers, copolymers and blends were used in all-polymer BHJ photodetectors and the effect of acceptor compositions on the key device parameters of dark current density and photocurrent was investigated. Compared with acceptor polymers and polymer blends, the devices based on acceptor copolymer showed lowered dark current and higher photocurrent, due to optimal molecular stacking and morphology of the BHJ active layer. The acceptor blends tend to cause a large phase separation and rough surface of the active layer, thus leading to a low detectivity of the device. Among all the acceptor compositions studied in this work, the all-polymer BHJ photodetector based on a donor polymer (PolyD) and an acceptor copolymer (PolyAA'50) exhibited the highest specific detectivity of over 10(12) Jones in the spectral region of 320-980 nm under -0.1 V bias. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码：173 / 179
页数：7
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