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Benzodithiophene‐Fused Perylene Bisimides as Electron Acceptors for Non‐Fullerene Organic Solar Cells with High Open‐Circuit Voltage
Author(s) -
Tian Zhongrong,
Guo Yiting,
Li Junyu,
Li Cheng,
Li Weiwei
Publication year - 2019
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201900309
Subject(s) - perylene , organic solar cell , fullerene , open circuit voltage , materials science , electron acceptor , conjugated system , photochemistry , tandem , energy conversion efficiency , polymer solar cell , homo/lumo , solar cell , optoelectronics , molecule , polymer , chemistry , voltage , organic chemistry , physics , quantum mechanics , composite material
Tandem‐junction organic solar cells require solar cells with visible light photo‐response as front cells, in which an open‐circuit voltage ( V oc ) above 1.0 V is highly demanded. In this work, we are able to develop electron acceptors to fabricate non‐fullerene organic solar cells (NFOSCs) with a very high V oc of 1.14 V. This was realized by designing perylene bisimide (PBI)‐based conjugated materials fused with benzodithiophene, in which Cl and S atom were introduced into the molecules in order to lower the frontier energy levels. The fused structures can reduce the aggregation of PBI unit and meanwhile maintain a good charge transport property. The new electron acceptors were applied into NFOSCs by using Cl and S substituted conjugated polymers as electron donor, in which an initial power conversion efficiency of 6.63 % and a high V oc of 1.14 V could be obtained. The results demonstrate that the molecular design by incorporating Cl and S atom into electron acceptors has great potential to realize high performance NFOSCs.