Non-fullerene organic solar cells (OSCs) have attracted great attention due to their advantages such as tunable energy levels, reduced energy loss, strong light absorption. Here, three small molecules with polar functional groups were utilized to modify the surface of zinc oxide (ZnO) electron transport layer through self-assembled monolayers (SAMs) formation. Inverted non-fullerene OSCs with PBDB-T:ITIC blend as active layer based on the ZnO with SAMs modification showed enhanced device performance (10.90%) compared to that without SAM treatment (10.03%). The ultraviolet photoelectron spectroscopy results revealed that the SAMs could lower the surface work function of ZnO, allowing for better electron extraction. The analysis results of J-V characteristics under different light illumination intensities suggested more efficient charge dissociation and weaker trap-assisted bimolecular recombination in the devices with SAMs modification. Our work provides an effective approach to modify the ZnO surface for efficient non-fullerene OSCs.

非富勒烯有机太阳能电池（OSC）由于具有可调节的能级，减少的能量损失，强的光吸收性等优点而备受关注。在这里，三个具有极性官能团的小分子被用来通过自组装单分子膜（SAMs）的形成来修饰氧化锌（ZnO）电子传输层的表面。与未经SAM处理的（10.03％）相比，基于ZnO的PBDB-T：ITIC共混物作为活性层的反相非富勒烯OSC显示出增强的器件性能（10.90％）。紫外光电子能谱分析结果表明，SAMs可以降低ZnO的表面功函数，从而更好地提取电子。合资企业的分析结果在不同光照强度下的特性表明，在具有SAMs修饰的器件中，电荷解离更有效，陷阱辅助的双分子重组更弱。我们的工作为有效的非富勒烯OSC改性ZnO表面提供了有效的方法。