Enhancing the photovoltaic properties of low bandgap terpolymers based on benzodithiophene and phenanthrophenazine by introducing different second acceptor units

被引：21

作者：

Fan, Qunping ^{[1
]}

Xu, Xiaopeng ^{[2
]}

Liu, Yu ^{[1
]}

Su, Wenyan ^{[1
]}

He, Xunming ^{[1
]}

Zhang, Youming ^{[1
]}

Tan, Hua ^{[1
]}

Wang, Yafei ^{[1
]}

Peng, Qiang ^{[2
]}

Zhu, Weiguo ^{[1
]}

机构：

[1] Xiangtan Univ, Minist Educ, Coll Chem, Key Lab Environm Friendly Chem & Applicat, Xiangtan 411105, Peoples R China

[2] Sichuan Univ, Coll Chem, Minist Educ, Key Lab Green Chem & Technol, Chengdu 610064, Peoples R China

来源：

POLYMER CHEMISTRY | 2016年 / 7卷 / 09期

基金：

中国国家自然科学基金; 湖南省自然科学基金;

关键词：

POLYMER SOLAR-CELLS; CONJUGATED SIDE-CHAIN; PERFORMANCE; EFFICIENCY; COPOLYMERS; ISOINDIGO; DIKETOPYRROLOPYRROLE; DESIGN; SINGLE; DEVICE;

D O I：

10.1039/c5py01985k

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Two novel donor-acceptor (D-A) type random conjugated terpolymers PBDTT-PPzIID and PBDTT-PPzDPP were synthesized by copolymerizing electron-rich alkylthienyl benzodithiophene (BDTT) and two different electron-deficient units, in which phenanthrophenazine (PPz) was the first acceptor unit, and isoindigo (IID) or diketopyrrolopyrrole (DPP) with a strong electron-withdrawing ability was the second acceptor unit, respectively. Compared to their parent polymer PTTPPz-BDTT, a broadening of the band in the long wavelength region from 500 to 850 nm and a significant decrease in HOMO levels were observed for the random terpolymers. Ca and PFN-Br were used as interfacial layers to optimize the devices, respectively. Pleasingly, after replacing Ca/Al with PFN-Br/Al as the cathode, the performance of both polymer devices improved greatly. A maximum power conversion efficiency (PCE) of 5.91% was obtained with a V-oc of 0.73 V, a J(sc) of 11.75 mA cm(-2) and a FF of 68.8% in the PBDTT-PPzDPP/PC71BM-based device, while the PBDTT-PPzIID/PC71BM-based device achieved a PCE of 4.21%. To the best of our knowledge, this is one of the highest recorded FF values among PSCs based on previously reported phenazine copolymers.

引用

页码：1747 / 1755

页数：9

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