Boosting of the Performance of Perovskite Solar Cells through Systematic Introduction of Reduced Graphene Oxide in TiO2 Layers

Abstract

Abstract The effects of the inclusion of reduced graphene oxide (RGO) in TiO2 layers on performance of perovskite solar cells were systematically investigated. For this purpose, a wet chemical approach was examined to embed graphene oxide (GO) across the thickness of compact TiO2 (cTiO2) and mesoporous TiO2 (mTiO2) layers, which was followed by a thermally driven in situ conversion from GO to RGO. The presence of RGO at loadings of 0.15 wt % in the cTiO2 layer and of 0.015 wt % in the mTiO2 layer led to a power conversion efficiency (PCE) from 6.6% to 9.3% by 40% increase.