Extreme Electron‐Photon Interaction in Disordered Perovskites

• DOI: 10.1002/advs.202405709
• Publication Date: 2024-10-02T10:43:01Z
• Authors: Sergey S. Kharintsev; Elina I. Battalova; Ivan A. Matchenya; Albert G. Nasibulin; Alexander A. Maru...; Anatoly P. Pushkarev
• Keywords: crystal‐liquid duality; Science; near‐field photon momentum; Q; disordered perovskite; electron‐photon interaction; electronic Raman scattering; photoluminescence blinking; Research Article

Abstract The interaction of light with solids can be dramatically enhanced owing to electron‐photon momentum matching. This mechanism manifests when scattering from nanometer‐sized clusters including a specific case self‐assembled nanostructures that form long‐range translational order but local disorder (crystal‐liquid duality). In this paper, new strategy based on both cases for the light‐matter‐interaction enhancement in direct bandgap semiconductor – lead halide perovskite CsPbBr 3 by using electric pulse‐driven structural disorder, is addressed. disordered state allows generation confined photons, and formation an electronic continuum static/dynamic defect states across forbidden gap (Urbach bridge). Both mechanisms underlie photon‐momentum‐enabled Raman (ERS) single‐photon anti‐Stokes photoluminescence (PL) under sub‐band pump. PL/ERS blinking discussed associated thermal fluctuations cross‐linked [PbBr 6 ] 4‐ octahedra. Time‐delayed synchronization causes spontaneous emission at room temperature. These findings indicate role photon light‐matter interactions nanostructured solids.