MoO3/GO Hybrid Hole Extraction Layer Enabling High Efficiency in Organic Solar Cells

Abstract

The photovoltaic performance of organic solar cells (OSCs) are strongly influenced by the functionality of hole extraction layers. In this work, a bilayer structure hole extraction layer (HEL) of S-MoO3/GO was formed by solution processed MoO3 (S-MoO3) and graphene oxide (GO). The application of hybrid HEL helped polish the interfacial contact between HEL and active layers, resulting in an increased exciton dissociation, diminished charge recombination losses, and more efficient charge extraction probability, and thereby achieving improved photovoltaic performance. The excellent charge extraction capability was proved in nonfullerene PM6:Y6 and fullerene PTB7-Th:PC71BM blend system based cells. A champion efficiency of 13.56% was observed in PM6:Y6 based cell with S-MoO3/GO HEL, which was >34% higher than the efficiency of 10.08% in the control cell with pristine S-MoO3 HEL.

Keywords

• hybrid hole extraction layer
• graphene oxide
• interfacial engineering
• high efficiency
• organic solar cells