Making and breaking the exciton in layered halide hybrid perovskites

Layered halide hybrid organic−inorganic perovskites (LHP) [1] have been the subject of intense investigation before the rise of three-dimensional (3D) halide perovskites and their impressive performance in solar cells. Recently, LHP have also been proposed as attractive alternatives for photostable solar cells [2] and revisited for light-emitting devices. LHP present inherent quantum and dielectric confinements imposed by the organic layers sandwiching the inorganic core, and computational approaches have successfully help rationalized their properties [4-6].
Here combine theoretical and spectroscopic studies inspect the various ingredients of LHP strong exciton binding energy and the ways to break the electron-hole pair [3,4]. In particular, we propose an elastic model providing design principles for future layered perovskites with optimized properties for photovoltaics or light emission [7].

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