A Metal-Oxide Interconnection Layer for Polymer Tandem Solar Cells with an Inverted Architecture

A metal-oxide-only interconnecting layer for application in inverted polymer tandem solar cells is reported. Good electrical and optical coupling of the two sub-cells is achieved by using a carefully designed MoO3/Al/ZnO layer, which leads to a power coversion efficiency of 5.1%. The results demonstrate that effective connection between polymer bulk heterojunctions can be realized by this facile metal-oxide interlayer.