The Photophysics of Halide Perovskite Solar Cells

This chapter discusses the basic optical properties of polycrystalline halide perovskite thin films, followed by the charge dynamics of these bare films and the interfacial charge-transfer mechanisms at the heterojunctions of perovskite solar cells. It also discusses the photophysical properties of perovskite single crystals (SCs) and their potential for perovskite optoelectronics. The photophysics and charge carrier dynamics in semiconductors is highly dependent on their electronic band structures. Knowledge of the dominant photoexcited species in perovskites is essential for a clear understanding of the working principles of perovskite solar cells. The presence of these charge transport layers would alter the relaxation pathways seen in the bare perovskite films. The ability to interpret and discern the transient spectral features and excitation dynamics in perovskite SCs is key to understanding its full photophysics picture. Perovskite SCs are expected to have high potential application as photovoltaic (PV) materials.