The Role of Chlorine in the Formation Process of “CH 3 NH 3 PbI 3‐x Cl x ” Perovskite

CH 3 NH 3 PbI 3‐x Cl x is a commonly used chemical formula to represent the methylammonium lead halide perovskite fabricated from mixed chlorine‐ and iodine‐containing salt precursors. Despite the rapid progress in improving its photovoltaic efficiency, fundamental questions remain regarding the atomic ratio of Cl in the perovskite as well as the reaction mechanism that leads to its formation and crystallization. In this work we investigated these questions through a combination of chemical, morphological, structural and thermal characterizations. The elemental analyses reveal unambiguously the negligible amount of Cl atoms in the CH 3 NH 3 PbI 3‐x Cl x perovskite. By studying the thermal characteristics of…

• NN
  National Natural Science Foundation of China
• SH
  Shun Hing Institute of Advanced Engineering