%0 Journal Article
%T Surface passivation of perovskite film for efficient solar cells
%J -
%D 2019
%R https://doi.org/10.1038/s41566-019-0398-2
%X In recent years, the power conversion efficiency of perovskite solar cells has increased to reach over 20%. Finding an effective means of defect passivation is thought to be a promising route for bringing further increases in the power conversion efficiency and the open-circuit voltage (VOC) of perovskite solar cells. Here, we report the use of an organic halide salt phenethylammonium iodide (PEAI) on HC(NH2)2¨CCH3NH3 mixed perovskite films for surface defect passivation. We find that PEAI can form on the perovskite surface and results in higher-efficiency cells by reducing the defects and suppressing non-radiative recombination. As a result, planar perovskite solar cells with a certificated efficiency of 23.32% (quasi-steady state) are obtained. In addition, a VOC as high as 1.18£¿V is achieved at the absorption threshold of 1.53£¿eV, which is 94.4% of the Shockley¨CQueisser limit VOC (1.25£¿V)
%U https://www.nature.com/articles/s41566-019-0398-2