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Impact of Fluorine Atoms on Perylene Diimide Derivative for Fullerene‐Free Organic Photovoltaics
Author(s) -
Zhao Liang,
Sun Hua,
Liu Xiaoyuan,
Liu Changmei,
Shan Haiquan,
Xia Jiuxu,
Xu Zongxiang,
Chen Fei,
Chen ZhiKuan,
Huang Wei
Publication year - 2017
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201700661
Subject(s) - homo/lumo , diimide , organic solar cell , perylene , materials science , fullerene , work function , energy conversion efficiency , fluorine , acceptor , electron affinity (data page) , photochemistry , polymer solar cell , electron acceptor , organic semiconductor , chemical physics , nanotechnology , chemistry , optoelectronics , molecule , organic chemistry , polymer , physics , layer (electronics) , condensed matter physics , metallurgy , composite material
The incorporation of fluorine atoms in organic semiconducting materials has attracted much attention recently due to its unique function to manipulate the molecular packing, film morphology and molecular energy levels. In this work, two perylenediimide (PDI) derivatives FPDI‐CDTph and FPDI‐CDTph2F were designed and synthesized to investigate the impact of fluorination on non‐fullerene acceptors. Both FPDI‐CDTph and FPDI‐CDTph2F exhibited strong and broad absorption profiles, suitable lowest unoccupied molecular orbital (LUMO) and highest occupied molecular orbital (HOMO) energy levels, and good electron transport ability. Compared with FPDI‐CDTph, the fluorinated acceptor (FPDI‐CDTph2F) afforded an optimal bulk heterojunction morphology with an interconnected and nanoscale phase separated structure that allowed more efficient exciton dissociation and balanced charge transport. Consequently, organic solar cells based on FPDI‐CDTph2F showed a much higher power conversion efficiency (PCE) of 6.03 % than that of FPDI‐CDTph based devices (4.10 %) without any post‐fabrication treatment.