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https://hdl.handle.net/20.500.14279/24310
Title: | Quasiparticle Band Structure and Phonon-Induced Band Gap Renormalization of the Lead-Free Halide Double Perovskite Cs2InAgCl6 | Authors: | Ha, Viet Anh Volonakis, George Lee, Hyungjun Zacharias, Marios Giustino, Feliciano |
Major Field of Science: | Engineering and Technology | Field Category: | Materials Engineering | Keywords: | Eigenvalues and eigenfunctions;Perovskite;Doping;Light emission properties;Phonon-induced gap | Issue Date: | 7-Oct-2021 | Source: | Journal of Physical Chemistry C, 2021, vol. 125, no. 39, pp. 21689-21700 | Volume: | 125 | Issue: | 39 | Start page: | 21689 | End page: | 21700 | Journal: | The Journal of Physical Chemistry C | Abstract: | The lead-free halide double perovskite Cs2InAgCl6 was recently designed in silico and subsequently synthesized in the lab. This perovskite is a wide-gap semiconductor with a direct band gap and exhibits extraordinary photoluminescence in the visible range upon Na doping. The light emission properties of Cs2InAgCl6 have successfully been exploited to fabricate stable single-emitter-based white-light LEDs with near unity quantum efficiency. An intriguing puzzle in the photophysics of this compound is that the onset of optical absorption is around 3 eV, but the luminescence peak is found around 2 eV. As a first step toward elucidating this mismatch and clarifying the atomic-scale mechanisms underpinning the observed luminescence, here, we report a detailed investigation of the quasiparticle band structure of Cs2InAgCl6 as well as the phonon-induced renormalization of the band structure. We perform calculations of bang gaps and effective masses using the GW method, and we calculate the phonon-induced band structure renormalization using the special displacement method. We find that GW calculations are rather sensitive to the functional used in the density functional theory calculations and that self-consistency on the eigenvalues is necessary to achieve quantitative agreement with experiments. Our most accurate band gap at room temperature is in the range of 3.1-3.2 eV and includes a phonon-induced gap renormalization of 0.2 eV. By computing the phonon-induced mass enhancement, we find that the electron carriers are in the weak polaronic coupling regime, while hole carriers are in the intermediate coupling regime as a result of the localized and directional nature of the Ag eg 4d states at the valence band top. | URI: | https://hdl.handle.net/20.500.14279/24310 | ISSN: | 19327447 | DOI: | 10.1021/acs.jpcc.1c06542 | Rights: | © American Chemical Society | Type: | Article | Affiliation : | University of Texas at Austin Université de Rennes Cyprus University of Technology |
Publication Type: | Peer Reviewed |
Appears in Collections: | Άρθρα/Articles |
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