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Coherent Spin and Quasiparticle Dynamics in Solution-Processed Layered 2D Lead Halide Perovskites.

Published version
Peer-reviewed

Type

Article

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Authors

Liu, Yu Yang Fredrik 
Dewi, Herlina Arianita 
Yin, Tingting 

Abstract

Layered 2D halide perovskites with their alternating organic and inorganic atomic layers that form a self-assembled quantum well system are analogues of the purely inorganic 2D transition metal dichalcogenides. Within their periodic structures lie a hotbed of photophysical phenomena such as dielectric confinement effect, optical Stark effect, strong exciton-photon coupling, etc. Detailed understanding into the strong light-matter interactions in these hybrid organic-inorganic semiconductor systems remains modest. Herein, the intricate coherent interplay of exciton, spin, and phonon dynamics in (C6H5C2H4NH3)2PbI4 thin films using transient optical spectroscopy is explicated. New insights into the hotly debated origins of transient spectral features, relaxation pathways, ultrafast spin relaxation via exchange interaction, and strong coherent exciton-phonon coupling are revealed from the detailed phenomenological modeling. Importantly, this work unravels the complex interplay of spin-quasiparticle interactions in these layered 2D halide perovskites with large spin-orbit coupling.

Description

Keywords

2D perovskites, coherent phonon dynamics, layered perovskites, pump‐probe spectroscopy, transient absorption

Journal Title

Adv Sci (Weinh)

Conference Name

Journal ISSN

2198-3844
2198-3844

Volume Title

5

Publisher

Wiley