Aldo Di Carlo (University of Rome Tor Vergata; Institute of structure of the matter, National Research Council (CNR-ISM), Rome)

Halide Perovskites: new materials for optoelectronic devices and detectors

Abstract: Halide Perovskites (HP) such as Methylammonium Lead Iodide are opening new opportunity for solution-process high performing optoelectronic devices such as solar cells, photodetectors, light-emitting diodes etc. The success of such materials is based on the ideal direct band gap, good electron and hole diffusion lengths and the easy manufacture. Moreover, tuning of electronic and optical properties can be achieved by varying cation composition (Cs, Rb, FA, MA etc.) and halide composition (I, Br, Cl). OHP are peculiar materials bridging the conventional semiconductor with ionic conductor. In fact, HP can be considered as crystalline liquids and such duality can explain the large polaron formation and screening of charge carriers that leads to their defect tolerance, one of the most surprising and exploitable properties of HPs. One of the most successful application of such materials is in the field of solar cell where a certified efficiency of 25.2% has been achieved for single cells and 29.15% for tandem perovskite/silicon. Moreover, radiation-hardness and self-healing properties of HP catalyzed a strong interest for application of HP in ionizing radiation detectors. In this talk I will review the main characteristics of the halide perovskites and the application to conventional optoelectronic devices showing possible applications in the field of high-energy physics.