In this work, the solution processed CH3NH3PbI3 perovskite/copper indium disulfide (CuInS2) planar heterojunction
solar cells with Al2O3 as a scaffold were fabricated at a temperature as low as 250°C for the first time, in which the
indium tin oxide (ITO)-coated glass instead of the fluorine-doped tin oxide (FTO)-coated glass was used as the
light-incidence electrode and the solution-processed CuInS2 layer was prepared to replace the commonly used TiO2
layer in previously reported perovskite-based solar cells.