LAUSR

It was reported that non-radiative charge carrier recombination in hybrid perovskite materials restricted device performance of perovskite solar cells. In this study, we report efficient perovskite solar cells through suppressed non-radiative charge carrier recombination by processing additive, aminopropanoic acid. It is found that aminopropanoic acid not only modulate the crystal growth processes, but also minimize defects of CH3NH3PbI3 thin films. Moreover, the CH3NH3PbI3 thin films processed with addition of aminopropanoic acid exhibit both enhanced photoluminescence and electroluminescence, elongated charge carrier lifetime, indicating that non-radiative charge carrier recombination within CH3NH3PbI3 thin films is drastically suppressed. As a result, perovskite solar cells fabricated by CH3NH3PbI3 thin films processed with addition of aminopropanoic acid exhibit approximatively 15% enhanced efficiency as compared with that by pristine CH3NH3PbI3 thin film. All these results demonstrate that our finding provides a facial way to improve efficiency of perovskite solar cells.