Defects Activity in Metal Halide Perovskites

Metal halide perovskites (chemical formula ABX₃, A = formamidinium (FA+), methylammonium (MA+), or Cs+ , B = Pb2+, Sn2+, X = I−, Br−, or Cl−) have demonstrated their potential as a material platform for a new generation of optoelectronic technology. One superior feature of metal halide perovskites is their continuously tunable bandgap from near infrared to ultraviolet by designing the chemical composition of the semiconductor crystalline unit. This enables them to provide light absorbers customizable for various applications.<br/>In this presentation I will assess the most recent advances in elucidating the (photo)chemistry of defects related to the chemical composition of the perovskite crystalline unit, with a special emphasis on the surface properties. I will show how they define the charge carrier dynamics and interface energetics in the semiconductor. Based on such understanding I will discuss the main electrical and spectroscopic features related to the activity of defects and how to interpret them to exploit these semiconductors in catalytic processes.