A simplistic approach to evaluate the power conversion efficiencies for hybrid charge transport layers in open-air fabricated perovskite solar cells

Three perovskite solar cells with a general architecture of FTO/GO-CuI/Perovskite/ZnO/Ag electrode were fabricated with different ratios of graphene oxide and copper iodide as hybrid hole transport layers in an open-air environment for the comparison purposes and to find better hole transport material. The obtained power conversion efficiencies were extrapolated to find the power conversion efficiencies of other compositions of these materials including graphene oxide and copper iodide only-based devices. Hence, enhanced information was obtained by just making three devices only, which allowed us to save a lot of time and resources as compared to making devices in the standard conditions. The power conversion efficiency was increased with the decrease in concentration of graphene oxide, hence copper iodide showed better hole transport characteristics. This simplistic approach to evaluate power conversion efficiencies for hybrid charge transport layers can be utilized for any combination of hole or electron hybrid transport layers in perovskite solar cells.