Marie CHERASSE, APPLI group, LOA: Ultrafast Dynamics in Lead Halide Perovskites

Hybrid lead halide perovskites are an intriguing class of semiconductors with excellent optoelectronic properties and promising for photovoltaic applications. A fundamental understanding of the ultrafast dynamics in these materials is required. In this work, we proposed to understand the dynamic role of phonons and their influence on electrons using THz-induced Kerr effect. We obtained coherent control over a Raman-active Pb-Br sublattice mode, which was found to dominate the ultrafast lattice polarizability in both single and complex A-site cation perovskites. This finding highlights the potential of the inorganic lattice for dynamic carrier screening and the related mechanism of charge carrier protection.

(Presentation in English)