Efficient semitransparent ternary polymer solar cells (PSCs) are fabricated with narrow band gap material PTB7-Th as donor, two narrow band gap nonfullerene materials BDTThIT-4F and IEICO-4F as one alloyed acceptor. Firstly, the content of IEICO-4F in acceptors is optimized in opaque PSCs with 100 nm Ag as electrode, power conversion efficiency (PCE) of the optimized opaque PSCs arrives to 12.03% with 50 wt% IEICO-4F in the alloyed acceptor. The 1 nm Au/10 nm Ag is designed to replace 100 nm Ag as semitransparent electrode. The semitransparent electrode exhibits high transmittance in visible light range and low transmittance in long wavelength range, which is beneficial to improve photon harvesting of active layers prepared with narrow band gap materials. The semitransparent ternary PSCs exhibit a PCE of 9.40% with 24.6% average visible transmittance from 370 nm to 740 nm, which should be among the highest values for semitransparent PSCs. This work indicates that ternary strategy may have great potential in preparing efficient semitransparent PSCs with two narrow band gap nonfullerene materials.

以窄带隙材料PTB7-Th作为供体，两种窄带隙非富勒烯材料BDTThIT-4F和IEICO-4F作为一种合金受体，制备了高效的半透明三元聚合物太阳能电池（PSC）。首先，在以100nm Ag为电极的不透明PSC中优化了受体中IEICO-4F的含量，在合金化受体中50％（重量）的IEICO-4F中，优化后的不透明PSC的功率转换效率（PCE）达到了12.03％。设计了1 nm Au / 10 nm Ag来代替100 nm Ag作为半透明电极。半透明电极在可见光范围内具有高透射率，而在长波长范围内具有低透射率，这有利于改善由窄带隙材料制备的有源层的光子收集。半透明三元PSC的PCE为9.40％，其中PCE为24。从370 nm到740 nm的平均可见光透射率为6％，这应该是半透明PSC的最高值之​​一。这项工作表明，三元策略在制备具有两种窄带隙非富勒烯材料的高效半透明PSC方面可能具有巨大潜力。