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A Halogenation Strategy for over 12% Efficiency Nonfullerene Organic Solar Cells
Author(s) -
Wang Yanbo,
Zhang Yamin,
Qiu Nailiang,
Feng Huanran,
Gao Huanhuan,
Kan Bin,
Ma Yanfeng,
Li Chenxi,
Wan Xiangjian,
Chen Yongsheng
Publication year - 2018
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201702870
Subject(s) - organic solar cell , acceptor , halogenation , crystallinity , materials science , halogen , energy conversion efficiency , photovoltaic system , polymer solar cell , absorption (acoustics) , photochemistry , polymer , organic chemistry , chemistry , optoelectronics , alkyl , electrical engineering , physics , engineering , composite material , condensed matter physics
Three acceptor–donor–acceptor type nonfullerene acceptors (NFAs), namely, F–F, F–Cl, and F–Br, are designed and synthesized through a halogenation strategy on one successful nonfullerene acceptor FDICTF (F–H). The three molecules show red‐shifted absorptions, increased crystallinities, and higher charge mobilities compared with the F–H. After blending with donor polymer PBDB‐T, the F–F‐, F–Cl‐, and F–Br‐based devices exhibit power conversion efficiencies (PCEs) of 10.85%, 11.47%, and 12.05%, respectively, which are higher than that of F–H with PCE of 9.59%. These results indicate that manipulating the absorption range, crystallinity and mobilities of NFAs by introducing different halogen atoms is an effective way to achieve high photovoltaic performance, which will offer valuable insight for the designing of high‐efficiency organic solar cells.