Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
High-performance ternary polymer solar cells are fabricated by using a wide bandgap polymer donor J52 and two non-fullerene acceptors, IT-M and IEICO, which have complementary light absorption spectra. Since the two acceptors, IT-M and IEICO, have similar lowest unoccupied molecular orbital levels, the Voc of the ternary device is very close to those of the binary devices.The two acceptors show excellent compatibility in their blend due to their very similar chemical structures, and efficient energy transfer from IT-M to IEICO occurs in the blend. Consequently, the obtained ternary OSC exhibits a high efficiency of 11.1%, with an enhanced short-circuit current density of 19.7 mA cm−2 and a fill factor of 0.668, suggesting that the use of two well-miscible non-fullerene acceptors with similar chemical structures is a feasible and effective approach for the fabrication of efficient ternary OSCs.
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