Significant Sesitization of Polymer Solar Cells Utilizing Optical Interference

Abstract

Significant improvement in the power conversion efficiency of organic photovoltaics has been made in the last decade. Ternary blend OPVs (organic photovoltaics), in which three organic semiconductors are blended to absorb wide range of the incident light, have shown to be an important strategy for improving the efficiency. Here, we show a ternary blend OPV system that used a high-crystalline polymer and a fullerene derivative as the host binary blend system and a nonfullerene n-type material as the third component. It was found that even with a small amount of the third component, optical absorption can be enhanced by the optical interference effect, which significantly boosted the efficiency of the ternary blend cell compared to the binary blend cell.