Performance enhancement of inverted polymer solar cells with fullerene ester derivant-modified ZnO film as cathode buffer layer

ZnO nanoparticles (NPs) modified with C60 pyrrolidine tris-acid ethyl ester (PyC60) are introduced in inverted polymer solar cells as cathode buffer layer. The morphology improvement of the ZnO/PyC60 bilayer film contributes to reducing series loss and interfacial charge recombination. Consequently, the resultant inverted solar cells exhibit an overall power conversion efficiency (PCE) of 8.76%.194