文摘
We fabricated a mesoporous perovskite solar cell with a 鈭?4% conversion efficiency, and we investigated its beneficial grain boundary properties of the perovskite solar cells through the use of scanning probe microscopy. The CH<sub>3sub>NH<sub>3sub>Pb(I<sub>0.88sub>,Br<sub>0.12sub>)<sub>3sub> showed a significant potential barrier bending at the grain boundary and induced passivation. The potential difference value in the x = 0.00 sample is 鈭?0 mV, and the distribution of the positive potential is lower than that of the x = 0.12 sample. We also investigated the polarization and hysteretic properties of the perovskite thin films by measuring the local piezoresponse. Specifically, the charged grain boundaries play a beneficial role in electron鈥揾ole depairing and in suppressing recombination in order to realize high-efficiency perovskite solar cells.