Ternary strategy has been widely proved to be one of the effective strategies to improve the performance of organic photovoltaic devices. How to select the third component to optimize the photon capture and phase separation of the active layer is the key problem. We have carried out a lot of experimental research on this subject, and found that the energy level position, optical band gap, molecular structure, extinction coefficient and other parameters among materials are the issues that must be considered in the selection of the third component materials, and the photovoltaic parameters of the two components are also important selection criteria. The photovoltaic parameters of the two components should have certain complementarity, which will help to further improve the performance of the three components. In this work, a series of binary and ternary photovoltaic devices were prepared by using polymer pm6 as donor, non fullerene materials iptbo-4cl and MF1 as acceptors. By optimizing the morphology of the active layer, the photoelectric conversion efficiency of the two components with pm6: iptbo-4cl and pm6: MF1 as the active layer is 14.94% and 12.07% respectively, showing that the short-circuit current density is 23.18 Ma cm-2 and 17.01 Ma cm-2, the filling factor is 72.17% and 78.18%, and the similar open circuit voltage is 0.893 V and 0.908 v. Compared with iptbo-4cl, the two devices with MF1 as the acceptor exhibit higher filling factor, which indicates that the pm6: MF1 active layer has formed an efficient carrier transport channel. With the increase of MF1 content in the acceptor, the filling factor of the three components increases gradually, which shows that MF1 can optimize the morphology of the active layer of the three components. At the same time, iptbo-4cl and MF1 have similar lowest unoccupied orbit (LUMO) energy levels, which is conducive to carrier transport in the active layer of three components. By adding 30 wt% MF1, the photoelectric conversion efficiency of the optimal three components increased to 15.74%. This work provides a new idea for the preparation of high-efficiency ternary organic photovoltaic devices: two non fullerene receptors with similar LUMO energy levels and good compatibility are used to prepare high-efficiency dual receptor ternary organic photovoltaic devices. Relevant papers were published online in small (DOI: 10.1002 / small. 202000441). Hu Zhenghao, Ph.D. student of Beijing Jiaotong University, Yang linqiang, Ph.D. student of Nanjing University of science and technology and Gao Wei, Ph.D. student of Shenzhen University are the co authors of the paper; Zhang Fujun, Professor of Beijing Jiaotong University, Tang Weihua, Professor of Nanjing University of science and technology and Yang chuluo, Professor of Shenzhen University are the co communicators of the paper. The work is supported by bl16b1 station of Shanghai synchrotron radiation source. Guess you like it
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