Effect of ch3nh3i concentration on performances of the perovskite solar cells

Abstract

Perovskite solar cells have attracted significant attention from the scientist and the industrialists because of the high efficiency. But the fabrication of high-quality film which controls the cell performances is a very difficult task. In this study methylammonium lead iodide perovskite (CH3NH3PbI3) material was synthesized using a two-step spin coating method; first, apply lead iodide (PbI2) and then methylammonium iodide (CH3NH3I, MAI). Fabricated films were analyzed by X-Ray Diffraction (XRD) and Scanning Electron Microscope (SEM). It confirmed that the methylammonium lead iodide (CH3NH3PbI3) perovskite structured material with an average crystal size of 350 nm was formed. And also, the effect of morphological changes with the concentration of MAI was studied. SEM images show the enhancement of the film quality by decreasing the MAI concentration. And also. the maximum fill factor of 0.32 has been achieved with the lowest MAI concentration (0.1M).