Solution-Processable All-Small-Molecules for High-Performance Nonfullerene Organic Solar Cells with High Crystallinity Acceptor
2019
Li, Zuojia | Liang, Renping | Wang, Jingwei | Na, Bing | Liu, Hesheng
In this work, two small molecule acceptors (IDIC and IDIC-4F) with different crystallinities and energy levels have been successfully applied in nonfullerene-based all-small molecule organic solar cells (NFASM-OSCs). The donor DFDT(DPP)₂ was chosen because of complementary absorption with IDIC and IDIC-4F. As an acceptor, IDIC-4F exhibited a higher power conversion efficiency (PCE) than IDIC due to better crystallinity. This work not only shows us how to balance the relationship between Vₒc and Jₛc but also suggests how to get a good phase separation morphology. Moreover, increased crystallinity helps to inhibit bimolecular recombination and increase charge mobility. By optimizing the device preparation conditions, the best PCE of 9.43% for DFDT(DPP)₂:IDIC-4F as an active layer was achieved with excitable Jₛc (16.83 mA cm–²) and fill factor (FF) (0.65). The FF and Jₛc of the resultant device show a significant increase, which is among the top efficiencies based on diketopyrrolopyrrole (DPP) being the terminal acceptor groups of NFSM-OSCs reported in the literature up to now.
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