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Article Dans Une Revue JACS Au Année : 2022

Revealing Weak Dimensional Confinement Effects in Excitonic Silver/Bismuth Double Perovskites

Résumé

Lead-free perovskites are attracting increasing interest as nontoxic materials for advanced optoelectronic applications. Here, we report on a family of silver/bismuth bromide double perovskites with lower dimensionality obtained by incorporating phenethylammonium (PEA) as an organic spacer, leading to the realization of two-dimensional double perovskites in the form of (PEA) 4 AgBiBr 8 (n = 1) and the first reported (PEA) 2 CsAgBiBr 7 (n = 2). In contrast to the situation prevailing in lead halide perovskites, we find a rather weak influence of electronic and dielectric confinement on the photophysics of the lead-free double perovskites, with both the 3D Cs 2 AgBiBr 6 and the 2D n = 1 and n = 2 materials being dominated by strong excitonic effects. The large measured Stokes shift is explained by the inherent soft character of the doubleperovskite lattices, rather than by the often-invoked band to band indirect recombination. We discuss the implications of these results for the use of double perovskites in light-emitting applications.
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hal-03871116 , version 1 (25-11-2022)

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Martina Pantaler, Valentin Diez-Cabanes, Valentin I E Queloz, Albertus Sutanto, Pascal Alexander Schouwink, et al.. Revealing Weak Dimensional Confinement Effects in Excitonic Silver/Bismuth Double Perovskites. JACS Au, 2022, 2 (1), pp.136 - 149. ⟨10.1021/jacsau.1c00429⟩. ⟨hal-03871116⟩
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