Enhancing the performance of CsPbIBr2 solar cells through zinc halides doping

B-site doping is an effective strategy to improve the performance of inorganic perovskite solar cells. Zinc halides (ZnX2, X I, Br, Cl) doped CsPbIBr2 solar cells were prepared by simply introducing ZnX2 salts into the precursor solution for one step spin-coating process. The doped inorganic perovskite films exhibit enhanced crystallinity and improved surface morphology. More over, the photoluminescence and single-carrier device characterizations confirm that the internal defect density of CsPbIBr2 films decreases remarkably after ZnX2 doping and the non-radiative recombination is suppressed. The CsPbIBr2 solar cells based on the ZnI2 doped films achieve a champion efficiency of 8.15%, outperforming that (6.93%) of the pristine counterpart.