Title |
Electron Acceptors With a Truxene Core and Perylene Diimide Branches for Organic Solar Cells: The Effect of Ring-Fusion
|
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Published in |
Frontiers in Chemistry, September 2018
|
DOI | 10.3389/fchem.2018.00328 |
Pubmed ID | |
Authors |
Kaiwen Lin, Shiliang Wang, Zhenfeng Wang, Qingwu Yin, Xi Liu, Jianchao Jia, Xiao'e Jia, Peng Luo, Xiaofang Jiang, Chunhui Duan, Fei Huang, Yong Cao |
Abstract |
In this work, a star-shaped planar acceptor named FTr-3PDI was synthesized via ring-fusion between truxene core and three bay-linked perylene diimide (PDI) branches. Compared to the unfused non-planar acceptor Tr-3PDI, FTr-3PDI exhibits better structural rigidity and planarity, as well as more effective conjugation between truxene core and PDI branches. As a result, FTr-3PDI shows up-shifted energy levels, enhanced light absorption coefficient, increased electron mobility, and more favorable phase separation morphology in bulk-heterojunction (BHJ) blend films as compared to Tr-3PDI. Consequently, FTr-3PDI afforded higher power conversion efficiency (PCE) in BHJ solar cells when blended with a polymer donor PTB7-Th. This work demonstrates that ring-fusion is a promising molecular design strategy to combine the merits of truxene and PDI for non-fullerene acceptors used in organic solar cells. |
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