SKM 2021 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 1: Focus Session: When theory meets experiment: Hybrid halide perovskites for applications beyond solar

HL 1.3: Invited Talk

Monday, September 27, 2021, 11:00–11:30, H4

Exciton structure symmetry analysis for quantum-well layered halide perovskites and charge-energy transfer in presence of π-conjugated organic chromophores — •Claudio Quarti — Laboratory for Chemistry of Novel Materials, University of Mons

2D layered halide perovskites are surging as interesting materials for opto-electronic applications. These systems are characterized by a quantum-well structure, with a semiconducting halide perovskite frame sandwiched between organic insulating spacers, the spatial confinement stabilizing tightly bound excitons. Still, full understanding of the native electronic and excitonic properties of layered halide perovskites is inherently hard to achieve, as many physical mechanisms contribute to complicate the scenario, including dielectric confinement, structural distortions, Spin-Orbit-Coupling (SOC), etc. Here, I review the electronic and excitonic structure of 2D layered halide perovskites, adopting group theory symmetry analysis. This highlights the analogies and differences in the atomic contributions on the single particle band structure, as compared to the 3D case, with SOC inherently included in the analysis. I will then consider the interaction between the organic spacers and the inorganic semiconducting frame in the case of a type II heterointerface, as obtained via incorporation of π-conjugated molecular moieties as organic spacers. With reference to tetrazine-based layered halide perovskite, I discuss several photoexcitation decay channels, with clear distinction between charge, singlet- and triplet-energy transfer.