Perovskite-organic hybrid tandem solar cells using a nanostructured perovskite layer as the light window and a PFN/doped-MoO3/MoO3 multilayer as the interconnecting layer.

In this study, we present a two-terminal perovskite (PVSK)-organic hybrid tandem solar cell with a nanostructured PVSK as the light window and a PFN/doped MoO3/MoO3 structure as the interconnecting layer (ICL). In this tandem structure, the PVSK layer is specially designed with a nanostructured surface morphology; thus the PCBM could be filled-up for forming intimately contacted interface with PVSK layers. This design could not only efficiently increase the device performance, it could also greatly remove the hysteresis of PVSK solar cells. The study indicates that doped MoO3 as the step layer plays a key role in protecting the underlying layer against multi-solution processes and aids in the efficient recombination of electrons and holes generated from the sub-cells. The hybrid tandem solar cell could achieve a high VOC of 1.58 V, which is the sum of those in the two sub-cells, and a high FF of 0.68, indicating the effectiveness of the multilayer ICL.