Synthesis and characterization of MAPbI3 thin film and its application in C-Si/perovskite tandem solar cell

Silicon, polymer and dye sensitized have been increasing rapidly in thin film of solar cells. Recently, perovskite is proposed as alternative material in the fabrication of solar cells. In this study, methyl ammonium lead triiodide (MAPbI(3), CH3NH3PbI3) perovskite thin film was prepared by two-step process of spin coating. The preparation process of thin film is summarized by reaction between the methyl ammonium iodide (CH3NH3I) and lead iodide (PbI2). The absorbent layer of the prepared perovskite solar cell is based on the MAPbI(3)(CH3NH3PbI3) thin film. The conversion efficiency of p-n silicon solar cells can be improved by preparing tandem solar cells. The X-ray diffraction result of the MAPbI(3)perovskite film manifested that it is polycrystalline with tetragonal system having a crystallite size of about 40 nm. The absorption spectrum of perovskite film was recorded by Ultra Violet-Visible spectrophotometer. The energy band gap of the MAPbI(3)film calculated by Tauc's formula was similar to 1.51 eV. The field emission scanning electron microscope image of the MAPbI(3)film surface elucidated a cubic-like crystal structure and other irregular structures also. The atomic force microscope image and the distribution chart of the grains of the film displayed that the grain size was similar to 58.7 nm. The results demonstrated that the conversion efficiency for silicon, perovskite and tandem (silicon/perovskite) solar cells are 3%, 4.83% and 7.42%, respectively.