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Highly Efficient Ternary Solar Cells with Efficient Förster Resonance Energy Transfer for Simultaneously Enhanced Photovoltaic Parameters
Author(s) -
Xiao Liangang,
Wu Xing,
Ren Guoxing,
Kolaczkowski Matthew A.,
Huang Guang,
Tan Wanyi,
Ma Lin,
Liu Yidong,
Peng Xiaobin,
Min Yonggang,
Liu Yi
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202105304
Subject(s) - materials science , ternary operation , organic solar cell , polymer solar cell , band gap , acceptor , optoelectronics , energy conversion efficiency , photovoltaic system , short circuit , open circuit voltage , fullerene , exciton , polymer , voltage , organic chemistry , chemistry , ecology , physics , quantum mechanics , computer science , composite material , biology , programming language , condensed matter physics
Introducing a third component into organic bulk heterojunction solar cells has become an effective strategy to improve photovoltaic performance. Meanwhile, the rapid development of non‐fullerene acceptors (NFAs) has pushed the power conversion efficiency (PCE) of organic solar cells (OSCs) to a higher standard. Herein, a series of fullerene‐free ternary solar cells are fabricated based on a wide bandgap acceptor, IDTT‐M, together with a wide bandgap donor polymer PM6 and a narrow bandgap NFA Y6. Insights from the morphological and electronic characterizations reveal that IDTT‐M has been incorporated into Y6 domains without disrupting its molecular packing and sacrificing its electron mobility and work synergistically with Y6 to regulate the packing pattern of PM6, leading to enhanced hole mobility and suppressed recombination. IDTT‐M further functions as an energy‐level mediator that increases open‐circuit voltage ( V OC ) in ternary devices. In addition, efficient Förster resonance energy transfer (FRET) between IDTT‐M and Y6 provides a non‐radiative pathway for facilitating exciton dissociation and charge collection. As a result, the optimized ternary device features a significantly improved PCE up to 16.63% with simultaneously enhanced short‐circuit current ( J SC ), V OC , and fill factor (FF).