Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Publication date: 6th February 2020
Recently organic solar cells have improved efficiencies significantly by taking advantage of nonfullerene acceptors. Thus, nonfullerene acceptors have become an important class of n-type materials for high performance organic solar cells. To develop new promising nonfullerene acceptor molecules, we synthesized a series of small molecule acceptors (DFDE-R and DFDO-R) comprised of electron-rich dithienosilole (D), electron-deficient difluorobenzodiathiazole (F) and 3-ethylrhodanine (R) units, and alkyl chains of 2-ethylhexyl (E) and octyl (O) groups. The DFDE-R and DFDO-R based devices showed low efficiencies mainly due to the high HOMO energy levels of the DFDE-R and DFDO-R acceptors. To lower the HOMO energy level, modifications to the backbone structure were made by replacing difluorobenzodiathiazole with difluorobenzene (FBz). The newly synthesized DFBz-R acceptor based devices exhibited higher efficiencies. Moreover, these new non-fullerene acceptors are synthetically scalable and stable under ambient conditions. Our investigation on the various synthesized molecules revealed the structure-photovoltaic properties, which can guide in synthesis of new high-performance non-fullerene small molecules for the further advancement in the field of organic solar cells.
This work was supported by the National Research Foundation (NRF-2018R1A5A1025594) of the Ministry of Science and ICT.
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