The effect of changing the ratios of perovskite triple cations and anions on the optical properties and solar cell performance of perovskite thin films

Abstract

(MACl0.33FAPbI3)x(Tri)1−x; (Tri = FA0.85MA0.10Cs0.05Pb(Br0.10I0.90)3, x = 0, 0.05, 0.1, 0.15) perovskite thin films were fabricated by a new method under an argon atmosphere. An X-ray diffraction technique was used to investigate the formed phases in different films. The effect of MACl0.33FAPbI3 doping on the absorbance, transmittance, reflectance, extinction coefficient, refractive index, dielectric function, optical conductivity, dielectric loss energy function, nonlinear optical parameters, and the photoluminescence emission of formed films was studied. The optical bandgap (Eg) of the undoped film was increased from 1.53 to 1.55 eV as it was doped with different amounts of MACl0.33FAPbI3. At 500 nm, the absorbance of doped film with 10% MACl0.33FAPbI3 has a maximum value as compared with other doped films. A device based on the undoped film with MACl0.33FAPbI3 has a short-current density (JSC), an open-circuit potential (VOC), a fill factor (FF), and a power conversion efficiency (PCE) of 23.73 mA cm−2, 0.864 V, 0.62, and 12.71%, respectively. Both FF and PCE values were enhanced to 0.676 and 14.86%, respectively, as the film doped with 5% MACl0.33FAPbI3.