ABSTRACT
This chapter discusses halide perovskite materials for photovoltaic applications with regard to optical properties, along with the feasibility of bandgap tuning in ABX3 perovskites. The long diffusion length and carrier lifetime and the unique shallow defect physics are key factors to achieve outstanding photovoltaic performance of halide perovskites. Also addressed are determinant factors for the formation of perovskite structure and the exploration to achieve thermally stable halide perovskite. Formamidinium lead iodide and caesium lead iodide are more thermally stable but less structurally so compared to methylammonium lead iodide due to tolerance factor issue. At the end, this chapter explores strategies developed to stabilize these perovskite structures.
