Interface Engineering in Perovskite Solar Cells by Low Concentration of Phenylethyl Ammonium Iodide Solution in the Antisolvent Step

In spite of the outstanding properties metal halide perovskites, its polycrystalline nature induces a wide range structural defects that results in charge losses affect final device performance and stability. Herein, surface treatment is used to passivate interfacial vacancies improve moisture tolerance. A functional organic molecule, phenylethyl ammonium iodide (PEAI) salt, dissolved with antisolvent step. The additive at low concentration does not induce formation low-dimensional perovskites species. Instead, species perovskite grain boundaries, which an effective passivation. For sake generality, this facile solution-processed synthesis was studied for different compositions, standard MAPbI3, double cation MA0.9Cs0.1PbI3 MA0.5FA0.5PbI3, increasing average photoconversion efficiency compared reference cell by 18%, 32%, 4% respectively, observed regular, n-i-p, inverted, p-i-n, solar configurations. This analysis highlights generality approach materials order reduce nonradiative recombination as impedance spectroscopy.