Fig. 1. Basic characterization of FAMACsPbI_2.52Br_0.48 thin film. (a) XRD image; (b) SEM image

Fig. 2. Ellipsometric experimental spectra and simulated spectra of the FAMACsPbI_2.52Br_0.48 thin film

Fig. 3. Optical constants of different types of doped perovskite. (a) Refractive index; (b) extinction coefficient

Fig. 4. Second derivative of the dielectric function of the FAMACsPbI_2.52Br_0.48 film

Fig. 5. Second derivative of the the dielectric function of different types of perovskites. (a) Real part; (b) imaginary part

Fig. 6. Modeling model and results of simulation experiment. (a) Structural model of perovskite solar cell; (b) reflectance, transmittance and absorptivity of solar cell

Fig. 7. LHE of the FAMACsPbI_2.52Br_0.48 perovskite solar cell