LAUSR

In this work, homogeneous PbI2 films were prepared by the spin-coating technique from PbI2-DMF solutions heated at temperatures ranging from room temperature to 120 °C. The homogeneity and morphology of the films change according to the used temperature of solution and are related to the size and distribution of PbI2 grains; the best crystallinity was observed when PbI2 solution was preheated at 100 °C. Lead halide perovskite films were prepared by close space sublimation of CH3NH3I over the prepared PbI2 films, and the area of the deposited films was 5 cm2. The transformation of PbI2 into perovskite was carried out at 100 °C under a pressure of −0.8 bar. A remarkable issue reported here is that, by controlling the morphology of the PbI2 layer with the temperature of PbI2-DMF solutions, the final features of MAPbI3 films can be controlled without requiring extra treatment. Therefore, the device with the best performance, out of a set fabricated with architecture ITO/PEDOT:PSS/perovskite/PC71BM/cathode, co...