The efforts to increase the efficiency of perovskite solar cells (PSC) as fourth generation solar cells has been carried out, one of which to repair electron transport layers made of titanium dioxide (TiO2) semiconductors. The TiO2 layer was successfully grown on Fluorine Tin Oxide (FTO) substrate using the liquid phase deposition method. The TiO2 layers were grown twice at 50oC. The first laye…