A study of inverted-type perovskite solar cells with various composition ratios of (FAPBI3)1−x(MAPbBr3)x

Abstract

This work presents mixed (FAPbI3)1−x(MAPbBr3)x perovskite films with various composition ratios,x (x = 0-1),which are formed using the spin coating method. The structural,optical,and electronic behaviors of the mixed (FAPbI3)1−x(MAPbBr3)x perovskite films are discussed. A device with structure glass/indium tin oxide (ITO)/poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS)/mixed perovskite/C60/BCP/Ag was fabricated. The mixed perovskite film was an active light-harvesting layer. PEDOT:PSS was a hole transporting layer between the ITO and perovskite. Both C60and bathocuproine (BCP) were electron transporting layers. MAPbBr3 was added to FAPbI3 with a composition ratio of x = 0.2,stabilizing the perovskite phase,which exhibited a uniform and dense morphology. The optimal device exhibited band matching with C60,resulting in a low series resistance (Rsh) and a high fill factor (FF). Therefore,the device with composition (FAPbI3)1−x(MAPbBr3)x and x = 0.2 exhibited outstanding performance.