Efficient top illuminated microcavity organic solar cells using air stable composite semitransparent electrodes

Abstract

Abstract An air stable ITO-free nonfullerene organic solar cell with very high power conversion efficiency is achieved by using microcavity based device architecture with PBDB-T-SF:IT-4F BHJ layer less than 100 nm. The microcavity device could strongly enhance light absorption in PBDB-T-SF:IT-4F BHJ layer and decrease reflection rate of overall device. the microcavity device with single BHJ layer has an 10% improvement in Jsc and 10.8% enhancement in PCE comparing with ITO based device leading to a high PCE of 14.02%. Especially, the Ag/Au composite electrode decreases layer thickness and improves light transmittion. The TeO2/MoO3 composite optical capping layer enhances air stability with equal low reflectance using single TeO2 layer. As a result, This device construction benefits for designing strong light absorption, air stable and high PCE OSC devices with nonfullerene acceptor based thin BHJ layer.