文献类型：期刊文献

英文题名：Side-Chain Effect on Cyclopentadithiophene/Fluorobenzothiadiazole-Based Low Band Gap Polymers and Their Applications for Polymer Solar Cells

作者：Li, Yongxi[1,2];Zou, Jingyu[1];Yip, Hin-Lap[1];Li, Chang-Zhi[1];Zhang, Yong[1];Chueh, Chu-Chen[1];Intemann, Jeremy[1];Xu, Yunxiang[1];Liang, Po-Wei[1];Chen, Yu[2];Jen, Alex K. -Y.[1]

机构：[1]Univ Washington, Dept Mat Sci & Engn, Seattle, WA 98195 USA;[2]E China Univ Sci & Technol, Key Lab Adv Mat, Inst Appl Chem, Shanghai 200237, Peoples R China

年份：2013

卷号：46

期号：14

起止页码：5497

外文期刊名：MACROMOLECULES

收录：;EI(收录号：20133116559033);WOS:【SCI-EXPANDED(收录号:WOS:000322417100011)】；

基金：The authors thank the support from the National Science Foundation (DMR-0120967), the Department of Energy (DE-FC3608GO18024/A000), the Air Force Office of Scientific Research (FA9550-09-1-0426), the Asian Office of Aerospace R&D (FA2386-11-1-4072), and Office of Naval Research (N00014-11-1-0300). A.K.-Y.J. thanks the Boeing Foundation for support. Y.L. expresses thanks for the State-Sponsored Scholarship for Graduate Students from the China Scholarship Council.

语种：英文

外文关键词：Open circuit voltage - Chains - Conjugated polymers - Energy gap

摘要：A series of cyclopentadithiophene-based low band gap conjugated polymers with varied side-chain patterns and F-substituents were synthesized. By replacing the shorter 2-ethylhexyl (EH) side-chain with the longer 3,7-dimethyloctyl (DMO) side-chain, it resulted in significant changes to the optical, electrochemical, and morphological properties of the polymers, as well as the subsequent performance of devices made from these materials. Solar cells fabricated from polymer with 2-ethylhexyl (EH) side-chain and monofluoro substituent exhibits increased open circuit voltage, short circuit current and fill factor, resulting in the highest power conversion efficiency (5.5%) in this series of polymers. This finding provides valuable insight for making more efficient low band gap polymers.