Berlin 2024 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 13: Poster I

HL 13.10: Poster

Monday, March 18, 2024, 15:00–18:00, Poster E

Energy-Momentum-Resolved Spectroscopy of Chiral Hybrid Perovskites — •Caroline Aschendorf¹, Jonathan Zerhoch^1,2,3, Shangpu Liu^1,2,3, and Felix Deschler¹ — ¹Physikalisch-Chemisches Institut, Universität Heidelberg — ²Walter Schottky Institut, Technische Universität München — ³Physics Department, TUM School of Natural Sciences, Technische Universität München

Energy-momentum-resolved spectroscopy allows for highly sensitive photoluminescence measurements, revealing the orientation of the emission dipole moment. Different momentum intensity profiles distinguish between in-plane (IP) and out-of-plane (OP) exciton orientations through s- and p-polarized components of the emitted light. Of particular interest is the investigation of the novel chiral 2D hybrid metal-halide perovskite (HMHP) (R/S)-3BrMBA₂PbI₄, which exhibits a high photoluminescence quantum yield (PLQY) of up to 39% and circularly polarized photoluminescence (CPL) of up to 52%.
Energy-momentum spectra were acquired for thin films and facets of single crystals of (R/S)-3BrMBA₂PbI₄, (R/S)-4BrMBA₂PbI₄, BA₂PbI₄, and the inorganic 3D perovskite CsPbBr₃. This allowed the modeling of the in-plane (IP) to out-of-plane (OP) exciton ratio, revealing a notable distribution towards OP excitons in certain materials.
The study of CPL in chiral materials aims to investigate the impact of chirality on exciton orientation. This knowledge is crucial for advancing chiral HMHP development with higher CPL and PLQY, holding promise for chiroptical applications and chiral spintronics.

Keywords: Perovskite; K-space Imaging; Circularly Polarized Photoluminescence