Rashba splitting in organic–inorganic lead–halide perovskites revealed through two-photon absorption spectroscopy

• DOI: 10.1038/s41467-022-28127-9
• Publication Date: 2022-01-25T11:03:10Z
• Authors: Evan Lafalce; Eric Amerling; Zhi-Gang Yu; Peter C. Sercel; Luisa Whittaker-B...; Z. Valy Vardeny
• Keywords: Point reflection

The Rashba splitting in hybrid organic-inorganic lead-halide perovskites (HOIP) is particularly promising and yet controversial, due to questions surrounding the presence or absence of inversion symmetry. Here we utilize two-photon absorption spectroscopy study symmetry breaking different phases these materials. This an all-optical technique observe quantify effect as it probes bulk In particular, measure excitation spectra photoluminescence 2D, 3D, anionic mixed HOIP crystals, show that additional band above, but close optical gap signature new transition channels originate from splitting. believed arise ionic impurities induce local electric fields. observation has significant implications for understanding their spintronic optoelectronic device properties.