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A New Electron‐Rich Unit for Polymer Electron Acceptors: 4,4‐Difluoro‐4 H ‐cyclopenta[2,1‐b:3,4‐b′]dithiophene
Author(s) -
Zhao Ruyan,
Min Yang,
Dou Chuandong,
Liu Jun,
Wang Lixiang
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201702303
Subject(s) - homo/lumo , steric effects , electron acceptor , intermolecular force , polymer , electron , acceptor , unit (ring theory) , materials science , chemistry , crystallography , photochemistry , stereochemistry , molecule , physics , organic chemistry , condensed matter physics , mathematics , mathematics education , quantum mechanics
Abstract We report 4,4‐difluoro‐4 H ‐cyclopenta[2,1‐b:3,4‐b′]dithiophene (fCDT) as a new electron‐rich unit to design polymer electron acceptors. Owing to the fluoro substitutes, fCDT unit exhibits downshifted LUMO energy level, diminished steric hindrance effect and strong intermolecular interaction. The resulting polymer electron acceptor exhibits low‐lying LUMO energy level and high electron mobility, as well as good all‐polymer solar cell device performance.