Photoelectric Conversion Study Of Nanocrystalline Chemical Solar Cell

Since the industrial revolution,the use of fossil fuels has caused serious environmental pollution.At the same time,the finiteness of fossil resources also makes the development of renewable and clean energy extremely urgent.Solar energy as an inexhaustible and clean energy,has various applications.The solar cell has experienced three generations such as silicon solar cells,thin-film solar cells and nanocrystalline chemical solar cells.Since 2009,perovskite solar cells evolving from dye sensitized solar cells become a hot research topic.The photoelectric conversion efficiency of perovskite solar cells has increased from 3.8%to 22.7%.In this paper,photoelectric conversion in nanocrystalline chemical solar cells were studied as shown in the following three parts.The first part studied the layer boundary effect of TiO₂ electronic transport layer in nanocrystalline chemical solar cells on electronic transport.The layer boundary can reduce electronic diffusion distance and increase capacitance of the cell,but the absorption layer with good photoelectric property can avoid its effect on photoelectric conversion efficiency of the cell.The second part studied the preparation of CH₃NH₃PbI_3-xCl_x(MAPbI_3-xCl_x)perovskite as absorption layer and the photoelectric conversion of solar cells.CH₃NH₃PI_3-xCl_x perovskites were successfully prapeared via the rection between HPbI_1-xCl_x precursor and methylamine gas.The grain size of pure MAPbI_3-xCl_x perovskite can reach up to 1 microns with a photoelectric conversion efficiency of 17%.The third part studied the preparation of HC（NH₂）₂PbI₃（FAPbI₃）perovskite as absorption layer and the photoelectric conversion of solar cells.FAPbI₃ perovskite was prepared via a 2D-3D spontaneous conversion reaction at room temperature and the formation of nonperovskiteδ-FAPbI₃ can be avoided.The grain size of FAPbI₃ perovskite can reach up to 2 microns with a highest efficiency of 20.39%.