Highly efficient planar heterojunction perovskite solar cells with sequentially dip-coated deposited perovskite...

High-performance planar heterojunction (PHJ) perovskite solar cells (PrSCs) with MAPbI₃ perovskite films were fabricated using a facile, environmentally benign, efficient and low-cost dip-coating deposition approach on a bilayered ZnO/TiO₂ electron transport system from aqueous non-halide Pb(NO₃)₂. Outstanding performance of PrSCs was achieved due to the PHJ configuration of FTO/TiO₂/ZnO/MAPbI₃/spiro-OMeTAD/MoO₃/Ag. These PHJ PrSCs exhibited better performance and stability with thinner ZnO layers in contrast to those with mesoporous TiO₂ scaffolds, indicating that the thickness of the ZnO layer in the PHJ architecture significantly affected the surface coverage, morphology, crystallinity, and stability of the MAPbI₃ perovskite films processed by dip-coating deposition.