Preparation and performance of organic–inorganic halide perovskites

Layered organic–inorganic perovskites have potential application in solar cells because of their unique electrical and optical properties. These materials can also overcome the instability of organic sensitizers and the disorder of metal oxides. A preliminary study on the preparation of organic–inorganic halide perovskites (CH 3 NH 3 PbI x Cl 3− x ) was conducted in this paper. The synthesis temperature and thermal stability in air were analyzed by thermogravimetric analysis and differential scanning calorimetry. The structure and morphology of the products were investigated by X-ray diffraction and scanning electron microscopy. UV–visible spectroscopy revealed that the material had good absorption within the range of 350–750 nm and can be used as the active light-absorbing layer of solar cells. Hybrid solar cells of FTO/TiO 2 –CH 3 NH 3 PbI x Cl 3− x /Spiro-MeOTAD/Ag were found to have a high fill factor of 0.5 but low power conversion efficiency of 0.28 %.