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Highly Efficient Ternary‐Blend Polymer Solar Cells Enabled by a Nonfullerene Acceptor and Two Polymer Donors with a Broad Composition Tolerance
Author(s) -
Xu Xiaopeng,
Bi Zhaozhao,
Ma Wei,
Wang Zishuai,
Choy Wallace C. H.,
Wu Wenlin,
Zhang Guangjun,
Li Ying,
Peng Qiang
Publication year - 2017
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201704271
Subject(s) - materials science , ternary operation , acceptor , open circuit voltage , band gap , energy conversion efficiency , miscibility , organic solar cell , polymer solar cell , polymer , copolymer , active layer , chemical engineering , optoelectronics , nanotechnology , voltage , composite material , layer (electronics) , physics , thin film transistor , quantum mechanics , computer science , condensed matter physics , engineering , programming language
Abstract In this work, highly efficient ternary‐blend organic solar cells (TB‐OSCs) are reported based on a low‐bandgap copolymer of PTB7‐Th, a medium‐bandgap copolymer of PBDB‐T, and a wide‐bandgap small molecule of SFBRCN. The ternary‐blend layer exhibits a good complementary absorption in the range of 300–800 nm, in which PTB7‐Th and PBDB‐T have excellent miscibility with each other and a desirable phase separation with SFBRCN. In such devices, there exist multiple energy transfer pathways from PBDB‐T to PTB7‐Th, and from SFBRCN to the above two polymer donors. The hole‐back transfer from PTB7‐Th to PBDB‐T and multiple electron transfers between the acceptor and the donor materials are also observed for elevating the whole device performance. After systematically optimizing the weight ratio of PBDB‐T:PTB7‐Th:SFBRCN, a champion power conversion efficiency (PCE) of 12.27% is finally achieved with an open‐circuit voltage ( V oc ) of 0.93 V, a short‐circuit current density ( J sc ) of 17.86 mA cm −2 , and a fill factor of 73.9%, which is the highest value for the ternary OSCs reported so far. Importantly, the TB‐OSCs exhibit a broad composition tolerance with a high PCE over 10% throughout the whole blend ratios.