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Caid M, Rached D, Rached H, Rached Y. Structural, elastic, electronic, and optical properties of lead-free halide double perovskites Cs 2BꞌBꞌꞌBr 6 (BꞌBꞌꞌ: BeMg, CdBe, CdGe, GeMg, GeZn, MgZn): Ab initio calculations. J Mol Model 2024; 30:59. [PMID: 38316715 DOI: 10.1007/s00894-024-05861-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Accepted: 01/31/2024] [Indexed: 02/07/2024]
Abstract
CONTEXT In our study, we theoretically investigated the structural, elastic, electronic, and optical characteristics of halide double perovskites (DPs) Cs2B'B''Br6 (B'B'': BeMg, CdBe, CdGe, GeMg, GeZn, MgZn). Structural stabilities were assessed based on the enthalpy of formation, tolerance factor, and elastic constants. Ductile and brittle behavior was examined using Poisson and Pugh's ratios. Based on electronic calculations, it has been concluded that Cs2B'B''Br6 double perovskites with B'B'' as BeMg or CdBe exhibit direct bandgaps, whereas those with B'B'' as CdGe, GeMg, GeZn, or MgZn display indirect bandgaps. Additionally, we thoroughly investigated the optical properties of double perovskites by analyzing all their parameters in the energy range spanning 0 to 13 eV. Primary absorption was noted in the ultraviolet (UV) region. METHODS In this work, all calculations were performed using the Wien2k package. The generalized gradient approximation (GGA) and the modified Becke-Johnson (mBJ) method were employed to describe the exchange-correlation interactions.
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Affiliation(s)
- Messaoud Caid
- Département De Physique, École Normale Supérieure de Bou Saâda, Bou Saâda, 28001, Algérie.
- Magnetic Materials Laboratory (MML), Faculty of Exact Sciences, Djillali Liabes University of Sidi Bel-Abbes, 22000, Sidi Bel-Abbes, Algeria.
| | - Djamel Rached
- Magnetic Materials Laboratory (MML), Faculty of Exact Sciences, Djillali Liabes University of Sidi Bel-Abbes, 22000, Sidi Bel-Abbes, Algeria
| | - Habib Rached
- Magnetic Materials Laboratory (MML), Faculty of Exact Sciences, Djillali Liabes University of Sidi Bel-Abbes, 22000, Sidi Bel-Abbes, Algeria
- Department of Physics, Hassiba Benbouali University of Chlef, Faculty of Exact Sciences and Informatics, 02000, Chlef, Algeria
| | - Youcef Rached
- Laboratory of Modelling and Simulation of Magnetic Properties of Hetero-structures (LPMH), Faculty of Sciences and Technology, Tissemsilt University, 38000, Tissemsilt, Algeria
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Jin S, Yuan H, Pang T, Zhang M, Li J, Zheng Y, Wu T, Zhang R, Wang Z, Chen D. Highly Bright and Stable Lead-Free Double Perovskite White Light-Emitting Diodes. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2308487. [PMID: 37918976 DOI: 10.1002/adma.202308487] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Revised: 10/15/2023] [Indexed: 11/04/2023]
Abstract
Lead-free double perovskites (DPs) are emerging highly stable emitters with efficient broadband self-trapped exciton (STE) photoluminescence (PL), but their low electroluminescent (EL) efficiency is a critical shortcoming. This work promotes the external quantum efficiency (EQE) and luminance of DP-based white light-emitting diode (wLED) with a normal device structure to 0.76% and 2793 cd m-2 via two modifications: This work prevents the formation of adverse metallic silver, spatially confined STE, and lowers local site symmetry in Cs2 Na0.4 Ag0.6 In0.97 Bi0.03 Cl6 DP by terbium doping; and this work develops a guest-host strategy to improve film morphology, reduce defect density, and increase carrier mobility. These alterations cause substantial increase in STE radiative recombination and charge injection efficiency of perovskite layer. Finally, pure white EL with ideal color coordinates of (0.328, 0.329) and a record-breaking optoelectronic performance is achieved by introducing additional green carbon dots in LED to fill the deficient green component.
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Affiliation(s)
- Shilin Jin
- College of Physics and Energy, Fujian Normal University, Fuzhou, Fujian, 350117, P. R. China
| | - He Yuan
- College of Physics and Energy, Fujian Normal University, Fuzhou, Fujian, 350117, P. R. China
| | - Tao Pang
- Huzhou Key Laboratory of Materials for Energy Conversion and Storage, College of Science, Huzhou University, Huzhou, Zhejiang, 313000, China
| | - Manjia Zhang
- College of Physics and Energy, Fujian Normal University, Fuzhou, Fujian, 350117, P. R. China
| | - Junyang Li
- College of Physics and Energy, Fujian Normal University, Fuzhou, Fujian, 350117, P. R. China
| | - Yuanhui Zheng
- Fujian Science and Technology Innovation Laboratory for Optoelectronic Information, Fuzhou, Fujian, 350116, P. R. China
- College of Chemistry, Fuzhou University, Fuzhou, Fujian, 350116, P. R. China
| | - Tianmin Wu
- Key Laboratory of Opto-Electronic Science and Technology for Medicine of Ministry of Education, College of Photonic and Electronic Engineering, Fujian Normal University, Fuzhou, Fujian, 350117, China
| | - Ruidan Zhang
- College of Physics and Energy, Fujian Normal University, Fuzhou, Fujian, 350117, P. R. China
| | - Zhibin Wang
- College of Physics and Energy, Fujian Normal University, Fuzhou, Fujian, 350117, P. R. China
| | - Daqin Chen
- College of Physics and Energy, Fujian Normal University, Fuzhou, Fujian, 350117, P. R. China
- Fujian Science and Technology Innovation Laboratory for Optoelectronic Information, Fuzhou, Fujian, 350116, P. R. China
- Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and Engineering, Fujian Normal University, Fuzhou, Fujian, 350117, P. R. China
- Fujian Provincial Engineering Technology Research Center of Solar Energy Conversion and Energy Storage, Fujian Normal University, Fuzhou, Fujian, 350117, P. R. China
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Biega RI, Chen Y, Filip MR, Leppert L. Chemical Mapping of Excitons in Halide Double Perovskites. NANO LETTERS 2023; 23:8155-8161. [PMID: 37656044 PMCID: PMC10510582 DOI: 10.1021/acs.nanolett.3c02285] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 08/25/2023] [Indexed: 09/02/2023]
Abstract
Halide double perovskites comprise an emerging class of semiconductors with tremendous chemical and electronic diversity. While their band structure features can be understood from frontier-orbital models, chemical intuition for optical excitations remains incomplete. Here, we use ab initio many-body perturbation theory within the GW and the Bethe-Salpeter equation approach to calculate excited-state properties of a representative range of Cs2BB'Cl6 double perovskites. Our calculations reveal that double perovskites with different combinations of B and B' cations display a broad variety of electronic band structures and dielectric properties and form excitons with binding energies ranging over several orders of magnitude. We correlate these properties with the orbital-induced anisotropy of charge-carrier effective masses and the long-range behavior of the dielectric function by comparing them with the canonical conditions of the Wannier-Mott model. Furthermore, we derive chemically intuitive rules for predicting the nature of excitons in halide double perovskites using computationally inexpensive density functional theory calculations.
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Affiliation(s)
- Raisa-Ioana Biega
- MESA+
Institute for Nanotechnology, University
of Twente, 7500 AE Enschede, The Netherlands
| | - Yinan Chen
- Department
of Physics, University of Oxford, Clarendon Laboratory, Oxford OX1 3PU, United Kingdom
| | - Marina R. Filip
- Department
of Physics, University of Oxford, Clarendon Laboratory, Oxford OX1 3PU, United Kingdom
| | - Linn Leppert
- MESA+
Institute for Nanotechnology, University
of Twente, 7500 AE Enschede, The Netherlands
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