High efficiency carbon based CsPbI3 perovskite solar cells

• 1、School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083

Abstract：For the first time, CsPbI3 inorganic perovskite solar cells were prepared by the combination of TiO2 dense layer prepared at low temperature and inorganic perovskite under the condition of completely open air. The performance of solar cells was improved by adjusting the concentration of TiCl4. Six party crystal system of mesophase Cs4PbI6 and black α-CsPbI3 cubic phase structure was determined by XRD, using UV absorption spectra to investigate the optical properties of perovskite layers in different concentration of TiCl4. Scanning electron microscopy was used to observe the coverage rate of perovskite layers, showing that when it is 300 mM the coverage rate reaches the highest 98.59%. We studied systematically the effects of TiCl4 concentration on the performance of the solar cells, the short-circuit current and fill factor increase with the concentration of TiCl4, the open circuit voltage changes little, the final conversion efficiency increases gradually. EIS test results show that the higher the TiCl4 concentration is, the more difficult the charge recombination is, and the increase of TiCl4 concentration is beneficial to the solar cell. By optimizing the concentration of TiCl4, finally the maximum conversion efficiency was 6.27% when 300 mM was adopted.

Keywords： TiCl4 Concentration Perovskite CsPbI3 Solar Cell