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Biega RI, Jöbsis HJ, Gijsberg Z, Hüskens M, Hutter EM, Leppert L. Halide Mixing in Cs 2AgBi(I x Br 1-x ) 6 Double Perovskites: A Pathway to Tunable Excitonic Properties. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2024; 128:14767-14775. [PMID: 39257550 PMCID: PMC11382272 DOI: 10.1021/acs.jpcc.4c04453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/03/2024] [Revised: 08/09/2024] [Accepted: 08/13/2024] [Indexed: 09/12/2024]
Abstract
Cs2AgBiBr6 is an emerging double perovskite semiconductor with robust stability. However, its potential for photovoltaics is limited by its indirect band gap and localized electronic structure featuring a resonant exciton with a large binding energy. Cs2AgBi(I x Br1-x )6 nanocrystals with iodide concentrations of up to 100% were recently demonstrated, but an atomistic understanding of how halide mixing affects the electronic and excited-state structure is missing. Here, we use first-principles GW and Bethe-Salpeter Equation calculations to show that halide mixing leads to a pronounced change in the band gap and character of optical excitations. Exciton binding energies are reduced by up to a factor of 5, with significantly more delocalized excitons in I-rich compounds. We further show that phase-pure bulk alloys with x ≤ 0.11 can be fabricated using mechanosynthesis and measure a red-shifted absorption in line with our calculations. Our study highlights that halide mixing in double perovskites can not only lead to significant band gap changes but may also be used for tuning excitonic properties.
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Affiliation(s)
- Raisa-Ioana Biega
- MESA+ Institute for Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands
| | - Huygen J Jöbsis
- Debye Institute for Nanomaterials Science, Utrecht University, Princetonlaan 8, 3584 CB Utrecht, The Netherlands
| | - Zamorano Gijsberg
- Debye Institute for Nanomaterials Science, Utrecht University, Princetonlaan 8, 3584 CB Utrecht, The Netherlands
| | - Maxim Hüskens
- MESA+ Institute for Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands
| | - Eline M Hutter
- Debye Institute for Nanomaterials Science, Utrecht University, Princetonlaan 8, 3584 CB Utrecht, The Netherlands
| | - Linn Leppert
- MESA+ Institute for Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands
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2
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Rao Z, Zhao X, Gong X. Modeling of a Single-Band-Ratiometric Sensor Based on Lattice Positive Thermal Expansion in Eu 3+-Activated Halide Perovskite Cs 2NaEuCl 6. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2406348. [PMID: 39212638 DOI: 10.1002/smll.202406348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2024] [Revised: 08/21/2024] [Indexed: 09/04/2024]
Abstract
Recently, single-band ratiometric (SBR) thermometry has emerged as an innovative approach to traditional fluorescence thermometry, overcoming uncertainties associated with emission spectrum overlap or scattering while maintaining high spatial resolution and remote monitoring. This paper presents a novel Cs2NaEuCl6 perovskite prepared through a slow-cooling solution method. Additionally, it proposes a temperature sensor model that relies on the thermal quenching of charge-transfer state absorption. Mechanical studies highlight the role of lattice positive thermal expansion in affecting Eu3+ emission. Conversely, a significant emission enhancement is observed upon excitation corresponding to both the ground state and excited state absorption. The distinct luminescent behavior of this Eu3+-activated halide perovskite model makes it suitable for developing a highly sensitive SBR-type sensor with a relative sensitivity (Sr) exceeding 1.5% K-1 and temperature resolution (𝛿T) below 1 K at room temperature. Furthermore, it demonstrates the thermal stability during multiple heating-cooling cycles. Finally, the practical applicability of the proposed SBR model is demonstrated by employing a self-manufactured film sensor that enables precise real-time temperature detection for electronic components. The work is regarded as a significant stride toward the development of cutting-edge and exquisitely sensitive thermometers based on lanthanide-based halide double perovskites.
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Affiliation(s)
- Zhihui Rao
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Xiujian Zhao
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Xiao Gong
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, P. R. China
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Hazra V, Mandal A, Bhattacharyya S. Optoelectronic insights of lead-free layered halide perovskites. Chem Sci 2024; 15:7374-7393. [PMID: 38784758 PMCID: PMC11110173 DOI: 10.1039/d4sc01429d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2024] [Accepted: 04/22/2024] [Indexed: 05/25/2024] Open
Abstract
Two-dimensional organic-inorganic halide perovskites have emerged as promising candidates for a multitude of optoelectronic technologies, owing to their versatile structure and electronic properties. The optical and electronic properties are harmoniously integrated with both the inorganic metal halide octahedral slab, and the organic spacer layer. The inorganic octahedral layers can also assemble into periodically stacked nanoplatelets, which are interconnected by the organic ammonium cation, resulting in the formation of a superlattice or superstructure. In this perspective, we explore the structural, electronic, and optical properties of lead-free hybrid halides, and the layered halide perovskite single crystals and nanostructures, expanding our understanding of the diverse applications enabled by these versatile structures. The optical properties of the layered halide perovskite single crystals and superlattices are a function of the organic spacer layer thickness, the metal center with either divalent or a combination of monovalent and trivalent cations, and the halide composition. The distinct absorption and emission features are guided by the structural deformation, electron-phonon coupling, and the polaronic effect. Among the diverse optoelectronic possibilities, we have focused on the photodetection capability of layered halide perovskite single crystals, and elucidated the descriptors such as excitonic band gap, effective mass, carrier mobility, Rashba splitting, and the spin texture that decides the direct component of the optical transitions.
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Affiliation(s)
- Vishwadeepa Hazra
- Department of Chemical Sciences, Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata Mohanpur 741246 India
| | - Arnab Mandal
- Department of Chemical Sciences, Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata Mohanpur 741246 India
| | - Sayan Bhattacharyya
- Department of Chemical Sciences, Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata Mohanpur 741246 India
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Leppert L. Excitons in metal-halide perovskites from first-principles many-body perturbation theory. J Chem Phys 2024; 160:050902. [PMID: 38341699 DOI: 10.1063/5.0187213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2023] [Accepted: 12/19/2023] [Indexed: 02/13/2024] Open
Abstract
Metal-halide perovskites are a structurally, chemically, and electronically diverse class of semiconductors with applications ranging from photovoltaics to radiation detectors and sensors. Understanding neutral electron-hole excitations (excitons) is key for predicting and improving the efficiency of energy-conversion processes in these materials. First-principles calculations have played an important role in this context, allowing for a detailed insight into the formation of excitons in many different types of perovskites. Such calculations have demonstrated that excitons in some perovskites significantly deviate from canonical models due to the chemical and structural heterogeneity of these materials. In this Perspective, I provide an overview of calculations of excitons in metal-halide perovskites using Green's function-based many-body perturbation theory in the GW + Bethe-Salpeter equation approach, the prevalent method for calculating excitons in extended solids. This approach readily considers anisotropic electronic structures and dielectric screening present in many perovskites and important effects, such as spin-orbit coupling. I will show that despite this progress, the complex and diverse electronic structure of these materials and its intricate coupling to pronounced and anharmonic structural dynamics pose challenges that are currently not fully addressed within the GW + Bethe-Salpeter equation approach. I hope that this Perspective serves as an inspiration for further exploring the rich landscape of excitons in metal-halide perovskites and other complex semiconductors and for method development addressing unresolved challenges in the field.
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Affiliation(s)
- Linn Leppert
- MESA+ Institute for Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands
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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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Righetto M, Caicedo-Dávila S, Sirtl MT, Lim VJY, Patel JB, Egger DA, Bein T, Herz LM. Alloying Effects on Charge-Carrier Transport in Silver-Bismuth Double Perovskites. J Phys Chem Lett 2023; 14:10340-10347. [PMID: 37948051 PMCID: PMC10683067 DOI: 10.1021/acs.jpclett.3c02750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Revised: 10/30/2023] [Accepted: 11/01/2023] [Indexed: 11/12/2023]
Abstract
Alloying is widely adopted for tuning the properties of emergent semiconductors for optoelectronic and photovoltaic applications. So far, alloying strategies have primarily focused on engineering bandgaps rather than optimizing charge-carrier transport. Here, we demonstrate that alloying may severely limit charge-carrier transport in the presence of localized charge carriers (e.g., small polarons). By combining reflection-transmission and optical pump-terahertz probe spectroscopy with first-principles calculations, we investigate the interplay between alloying and charge-carrier localization in Cs2AgSbxBi1-xBr6 double perovskite thin films. We show that the charge-carrier transport regime strongly determines the impact of alloying on the transport properties. While initially delocalized charge carriers probe electronic bands formed upon alloying, subsequently self-localized charge carriers probe the energetic landscape more locally, thus turning an alloy's low-energy sites (e.g., Sb sites) into traps, which dramatically deteriorates transport properties. These findings highlight the inherent limitations of alloying strategies and provide design tools for newly emerging and highly efficient semiconductors.
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Affiliation(s)
- Marcello Righetto
- Department
of Physics, Clarendon Laboratory, University
of Oxford, Parks Road, Oxford OX1
3PU, United Kingdom
| | - Sebastián Caicedo-Dávila
- Physics
Department, TUM School of Natural Sciences, Technical University of Munich, James-Franck-Straße 1, Garching 85748 Germany
| | - Maximilian T. Sirtl
- Department
of Chemistry and Center for NanoScience (CeNS), University of Munich (LMU), Butenandtstr. 11, 81377 Munich, Germany
| | - Vincent J.-Y. Lim
- Department
of Physics, Clarendon Laboratory, University
of Oxford, Parks Road, Oxford OX1
3PU, United Kingdom
| | - Jay B. Patel
- Department
of Physics, Clarendon Laboratory, University
of Oxford, Parks Road, Oxford OX1
3PU, United Kingdom
| | - David A. Egger
- Physics
Department, TUM School of Natural Sciences, Technical University of Munich, James-Franck-Straße 1, Garching 85748 Germany
| | - Thomas Bein
- Department
of Chemistry and Center for NanoScience (CeNS), University of Munich (LMU), Butenandtstr. 11, 81377 Munich, Germany
| | - Laura M. Herz
- Department
of Physics, Clarendon Laboratory, University
of Oxford, Parks Road, Oxford OX1
3PU, United Kingdom
- Institute
for Advanced Study, Technical University
of Munich, Lichtenbergstrasse
2a, D-85748 Garching, Germany
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