Correlated electron and structural dynamics in quasi-2D Hybrid Perovskites

• Applicant: Professor Dr. Sebastian Maehrlein
• Subject Area: Experimental Condensed Matter Physics ; Physical Chemistry of Solids and Surfaces, Material Characterisation
• Term: since 2021
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 490867834

Hybrid lead halide perovskites are materials that currently attract widespread interest for their application in optoelectronic devices. Their quasi two-dimensional equivalents have shown higher stability than the 3D compounds and offer the possibility to tune the out-of-plane screening properties. Here, we propose to monitor concurrent excited state and screening dynamics on ultrafast timescales. Time resolved photoemission, photoluminescence and high-field THz excitation will provide complementary views on the entangled degrees of freedom. In particular, we aim to follow the exciton formation, quantify the spin-orbit interaction, and control screening effects due to dynamic disorder, cation orientation and electronic confinement; all of these being potential ingredients for Rashba splitting and ferroelectricity in this material class. Our research project will offer novel insights on non-equilibrium physics and might as well lead to new strategies for materials optimization.

• DFG Programme: Research Grants
• International Connection: France
• Cooperation Partners: Professorin Dr. Emmanuelle Deleporte; Professor Dr. Luca Perfetti