High performance solid-state PbS quantum dot-sensitized solar cells prepared by introduction of hybrid perovskite inter-layer.

High performance solid-state PbS quantum dot-sensitized solar cells (QD-SSCs) with stable 9.2 % power conversion efficiency at 1 Sun condition are demonstrated by introduction of hybrid perovskite inter-layer. The PbS QDs formed on mesoscopic TiO¬¬2 (mp-TiO2) by spin-assisted successive precipitation and anionic exchange reaction method do not exhibit PbSO4 but have PbSO3 oxidation species. By introducing perovskite inter-layer in between mp-TiO2/PbS QDs and poly-3-hexylthiophene, the PbSO3 oxidation species are fully removed in the PbS QDs and thereby the efficiency of PbS QD-SSCs is enhanced over 90 % compared to the pristine PbS QD-SSCs.