By means of an ab initio investigation, exploiting many-body perturbation theory approaches on top of ground-state density functional theory calculations, we disclose the impact of the electronic correlation on the band structure and optical properties of a class of recently synthesized Pb-free 2D-layered halide perovskites, namely, (BA)4AgBiBr8 and (BA)2CsAgBiBr7. We observe strong out-of-plane excitonic dipoles characterizing the optical spectra, a result that suggests the potential applicability of these layered hybrid materials in photonics and plasmonics, where the perpendicular field direction plays a relevant role.
Strong out-of-plane excitons in 2D hybrid halide double perovskites
Present address: Department of Civil & Environmental Engineering (DICA), The University of Perugia, Via G. Duranti 93, I-06125 Perugia, Italy.
Note: This paper is part of the APL Special Collection on New Solution-processed Perovskites and Perovskite-inspired Optoelectronic Materials and Devices.
Maurizia Palummo, Sara Postorino, Costanza Borghesi, Giacomo Giorgi; Strong out-of-plane excitons in 2D hybrid halide double perovskites. Appl. Phys. Lett. 2 August 2021; 119 (5): 051103. https://doi.org/10.1063/5.0059441
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