期刊
ADVANCED MATERIALS
卷 29, 期 46, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201704271
关键词
broad composition tolerance; charge transfer; energy transfer; nonfullerene acceptors; ternary blend polymer solar cells
类别
资金
- NSFC [51573107, 91633301, 21432005]
- Foundation of State Key Laboratory of Polymer Materials Engineering [sklpme 2017-2-04]
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 PBDBT: 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.
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