Design and Synthesis of Chlorinated Benzothiadiazole-Based Polymers for Efficient Solar Energy Conversion

被引：63

作者：

Hu, Zhiming ^{[1
,2
]}

Chen, Hui ^{[1
]}

Qu, Jianfei ^{[1
]}

Zhong, Xiaowei ^{[1
]}

Chao, Pengjie ^{[1
]}

Xie, Mo ^{[1
]}

Lu, Wei ^{[1
]}

Liu, Anhua ^{[2
]}

Tian, Leilei ^{[3
]}

Su, Yu-An ^{[4
]}

Chen, Wei ^{[4
,5
]}

He, Feng ^{[1
]}

机构：

[1] South Univ Sci & Technol China, Dept Chem, Shenzhen 518055, Peoples R China

[2] Xiamen Univ, Adv Mat Lab, Key Lab High Performance Ceram Fibers, Minist Educ,Coll Mat, Xiamen 361005, Peoples R China

[3] South Univ Sci & Technol China, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China

[4] Argonne Natl Lab, Div Mat Sci, 9700 Cass Ave, Lemont, IL 60439 USA

[5] Univ Chicago, Inst Mol Engn, 5640 South Ellis Ave, Chicago, IL 60637 USA

来源：

ACS ENERGY LETTERS | 2017年 / 2卷 / 04期

关键词：

CONJUGATED POLYMERS; CELLS; AGGREGATION; MODULATION;

D O I：

10.1021/acsenergylett.7b00092

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Chlorinated benzothiadiazole-based polymers with multiple chlorine atoms were designed and synthesized for polymer solar cells to achieve enhanced open-circuit voltage and improved power conversion efficiency. Chlorine substitution was found to affect molecular orientation, increase crystallinity, and thereby alter band gap and charge transport properties. The one-chlorine-substituted PCBT4T-2OD exhibited a larger portion of "face-on" orientation than that of other two polymers, nonchlorinated PBT4T-2OD and two-chlorine-substituted PCCBT4T-2OD, in the polymer:PC71BM blended films. PCBT4T-2OD also showed the largest crystallite sizes in those three polymers. The improved molecular orientation and larger crystallite sizes would definitely facilitate the charge transport in the active layer and enhance the performance of corresponding polymer solar cells. The highest power conversion efficiency of 8.21% with PC71BM was achieved in the photovoltaic device of PCBT4T-2OD. It is approximately 68% higher than that of the nonchlorine analog.

引用

页码：753 / 758

页数：6

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