Physics of 2D perovskites

International audience; In the past years, solution-processed organometallic perovskite based solar cells have emerged as a promising low-cost thin-film photovoltaic technology. 3D halide perovskite semiconductors and their 2D or OD nanostructures present specific symmetry and electronic properties, including giant spin-orbit coupling (SOC) effects. The ultrahigh softness of the halide perovskite lattice is also characteristic, and the role of the electron-phonon coupling, especially at temperatures relevant for device operation, is not fully understood. The presentation will focus on 2D perovskites, composed of perovskites layers sandwiched between two layers of large organic cations, described in the 90’s as self-assembled quantum and dielectric well systems.