Charge carrier dynamics controlling performance of lead-based halide perovskite solar cells

Abstract We review our studies to assess charge carrier dynamics inside a perovskite film and interfacial charge transfer dynamics for a perovskite layer sandwiched by an electron transporting layer (ETL) such as TiO 2 compact or mesoporous layer and a hole transporting layer (HTL) such as spiro-OMeTAD. Both electron and hole injection occur faster than electron-hole recombination inside a perovskite film, however, both change injection yields decrease with an increase in excitation intensity. Since the electron mobility inside methylammonium lead iodide (MAPbI 3 ) perovskite is lower than the hole mobility, employing a mesoporous ETL structure is suitable to maximise the electron injection yield. Interfacial charge recombination lifetime increases with an increase in perovskite film thickness. We therefore conclude that for p-type MAPbI 3 solar cells, the perovskite film thickness should be increased to the hole diffusion length, while the mesoporous ETL structure should be employed to maximise the electron injection yield.