Two new small-molecule nonfullerene acceptors containing methyl- and fluorine-substituted 2-(2,3-dihydro-3-oxo-1H-inden-1-ylidene)propanedinitrile (INCN) as end groups, namely, NFBDT-Me and NFBDT-F, were designed, synthesized and applied in organic solar cells. The influence of the methyl and fluorine groups on the absorption ability, energy levels, and photovoltaic performances was fully investigated. Compared to their parent molecule NFBDT, these two nonfullerene acceptors based devices exhibit higher PCEs with values of 11.00% and 10.62%, respectively. For NFBDT-Me, the improvement of PCE is mainly attributed to the higher V_oc, while for NFBDT-F, the increase of J_sc promotes the higher PCE. This suggests that appropriate manipulation of the end-group substituents of these non-fullerene acceptors is a promising way to enhance the PCEs of non-fullerene based OSCs.

含有甲基和氟取代的2-（2,3-二氢-3-氧代-1 H-茚满-1-亚烷基）丙腈（INCN）作为端基的两个新的小分子非富勒烯受体，即NFBDT-Me和NFBDT-F被设计，合成并应用于有机太阳能电池。充分研究了甲基和氟基团对吸收能力，能级和光伏性能的影响。与它们的母体分子NFBDT相比，这两个基于非富勒烯受体的器件表现出更高的PCE，其PCE值分别为11.00％和10.62％。对于NFBDT-ME，PCE的提高主要是由于较高的V _OC，而对于NFBDT-F，增加Ĵ _SC促进更高的PCE。这表明适当操纵这些非富勒烯受体的端基取代基是增强非富勒烯基OSC的PCE的有前途的方法。