Citation: Xiao-Cheng Liu, Qing-Wu Yin, Zhi-Cheng Hu, Zhen-Feng Wang, Fei Huang, Yong Cao. Perylene Diimide Based Isomeric Conjugated Polymers as Efficient Electron Acceptors for All-polymer Solar Cells[J]. Chinese Journal of Polymer Science, ;2019, 37(1): 18-27. doi: 10.1007/s10118-019-2188-1 shu

Perylene Diimide Based Isomeric Conjugated Polymers as Efficient Electron Acceptors for All-polymer Solar Cells

a.
State Key Laboratory of Luminescent Materials and Devices, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
b.
South China Institute of Collaborative Innovation, Dongguan 523808, China

Author Bio: † These authors contributed equally to this work
† These authors contributed equally to this work
Corresponding author: Fei Huang, msfhuang@scut.edu.cn
Received Date: 26 July 2018
Revised Date: 4 September 2018
Accepted Date: 11 September 2018
Available Online: 10 October 2018

We present here a series of perylene diimide (PDI) based isomeric conjugated polymers for the application as efficient electron acceptors in all-polymer solar cells (all-PSCs). By copolymerizing PDI monomers with 1,4-diethynylbenzene (para-linkage) and 1,3-diethynylbenzene (meta-linkage), isomeric PDI based conjugated polymers with parallel and non-parallel PDI units inside backbones were obtained. It was found that para-linked conjugated polymer (PA) showed better solubility, stronger π-π stacking, more favorable blend morphology, and better photovoltaic performance than those of meta-linked conjugated polymers (PM) did. Device based on PTB7-Th:PA (PTB7-Th:poly{4,8-bis[5-(2-ethylhexyl)-thiophen-2-yl]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl-alt-3-fluoro-2-[(2-ethylhexyl)-carbonyl]thieno[3,4-b]thiophene-4,6-diyl}) showed significantly enhanced photovoltaic performance than that of PTB7-Th:MA (3.29% versus 0.92%). Moreover, the photovoltaic performance of these polymeric acceptors could be further improved via a terpolymeric strategy. By copolymerizing a small amount of meta-linkages into PA, the optimized terpolymeric acceptors enabled to enhance photovoltaic performance with improved the short-circuit current density (J_sc) and fill factor (FF), resulting in an improved power conversion efficiency (PCE) of 4.03%.
- Isomeric conjugated polymers,
- All-polymer solar cells,
- Electron acceptors,
- Perylene diimide
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沈阳化工大学材料科学与工程学院沈阳 110142