1
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Hooper RW, Lin K, Veinot JGC, Michaelis VK. 3D to 0D cesium lead bromide: A 79/81Br NMR, NQR and theoretical investigation. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2023; 352:107472. [PMID: 37186965 DOI: 10.1016/j.jmr.2023.107472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 04/26/2023] [Accepted: 04/30/2023] [Indexed: 05/17/2023]
Abstract
Inorganic metal halides offer unprecedented tunability through elemental variation of simple three-element compositions, but can exhibit complicated phase behaviour, degradation, and microscopic phenomena (disorder/dynamics) that play an integral role for the bulk-level chemical and physical properties of these materials. Understanding the halogen chemical environment in such materials is crucial to addressing many of the concerns regarding implementing these materials in commercial applications. In this study, a combined solid-state nuclear magnetic resonance, nuclear quadrupole resonance and quantum chemical computation approach is used to interrogate the Br chemical environment in a series of related inorganic lead bromide materials: CsPbBr3, CsPb2Br5, and Cs4PbBr6. The quadrupole coupling constants (CQ) were determined to range from 61 to 114 MHz for 81Br, with CsPbBr3 exhibiting the largest measured CQ and Cs4PbBr6 the smallest. GIPAW DFT was shown to be an excellent pre-screening tool for estimating the EFG of Br materials and can increase experimental efficiency by providing good starting estimates for acquisition. Finally, the combination of theory and experiment to inform the best methods for expanding further to the other quadrupolar halogens is discussed.
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Affiliation(s)
- Riley W Hooper
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Katherine Lin
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Jonathan G C Veinot
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Vladimir K Michaelis
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada.
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2
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Mishra A, Hope MA, Grätzel M, Emsley L. A Complete Picture of Cation Dynamics in Hybrid Perovskite Materials from Solid-State NMR Spectroscopy. J Am Chem Soc 2022; 145:978-990. [PMID: 36580303 PMCID: PMC9853870 DOI: 10.1021/jacs.2c10149] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The organic cations in hybrid organic-inorganic perovskites rotate rapidly inside the cuboctahedral cavities formed by the inorganic lattice, influencing optoelectronic properties. Here, we provide a complete quantitative picture of cation dynamics for formamidinium-based perovskites and mixed-cation compositions, which are the most widely used and promising absorber layers for perovskite solar cells today. We use 2H and 14N quadrupolar solid-state NMR relaxometry under magic-angle spinning to determine the activation energy (Ea) and correlation time (τc) at room temperature for rotation about each principal axis of a series of organic cations. Specifically, we investigate methylammonium (MA+), formamidinium (FA+), and guanidinium (GUA+) cations in current state-of-the-art single- and multi-cation perovskite compositions. We find that MA+, FA+, and GUA+ all have at least one component of rotation that occurs on the picosecond timescale at room temperature, with MA+ and GUA+ also exhibiting faster and slower components, respectively. The cation dynamics depend on the symmetry of the inorganic lattice but are found to be insensitive to the degree of cation substitution. In particular, the FA+ rotation is invariant across all compositions studied here, when sufficiently above the phase transition temperature. We further identify an unusual relaxation mechanism for the 2H of MA+ in mechanosynthesized FAxMA1-xPbI3, which was found to result from physical diffusion to paramagnetic defects. This precise picture of cation dynamics will enable better understanding of the relationship between the organic cations and the optoelectronic properties of perovskites, guiding the design principles for more efficient perovskite solar cells in the future.
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3
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Landi N, Maurina E, Marongiu D, Simbula A, Borsacchi S, Calucci L, Saba M, Carignani E, Geppi M. Solid-State Nuclear Magnetic Resonance of Triple-Cation Mixed-Halide Perovskites. J Phys Chem Lett 2022; 13:9517-9525. [PMID: 36200785 PMCID: PMC9575147 DOI: 10.1021/acs.jpclett.2c02313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Accepted: 09/15/2022] [Indexed: 06/16/2023]
Abstract
Mixed-cation lead mixed-halide perovskites are the best candidates for perovskite-based photovoltaics, thanks to their higher efficiency and stability compared to the single-cation single-halide parent compounds. TripleMix (Cs0.05MA0.14FA0.81PbI2.55Br0.45 with FA = formamidinium and MA = methylammonium) is one of the most efficient and stable mixed perovskites for single-junction solar cells. The microscopic reasons why triple-cation perovskites perform so well are still under debate. In this work, we investigated the structure and dynamics of TripleMix by exploiting multinuclear solid-state nuclear magnetic resonance (SSNMR), which can provide this information at a level of detail not accessible by other techniques. 133Cs, 13C, 1H, and 207Pb SSNMR spectra confirmed the inclusion of all ions in the perovskite, without phase segregation. Complementary measurements showed a peculiar longitudinal relaxation behavior for the 1H and 207Pb nuclei in TripleMix with respect to single-cation single-halide perovskites, suggesting slower dynamics of both organic cations and halide anions, possibly related to the high photovoltaic performances.
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Affiliation(s)
- Noemi Landi
- Department
of Chemistry and Industrial Chemistry, University
of Pisa, via G. Moruzzi 13, 56124Pisa, Italy
| | - Elena Maurina
- Department
of Chemistry and Industrial Chemistry, University
of Pisa, via G. Moruzzi 13, 56124Pisa, Italy
| | - Daniela Marongiu
- Department
of Physics, University of Cagliari, S.P. Monserrato-Sestu Km. 0700, 09042Monserrato, Cagliari, Italy
| | - Angelica Simbula
- Department
of Physics, University of Cagliari, S.P. Monserrato-Sestu Km. 0700, 09042Monserrato, Cagliari, Italy
| | - Silvia Borsacchi
- Institute
for the Chemistry of OrganoMetallic Compounds - ICCOM, Italian National Research Council - CNR, via G. Moruzzi 1, 56124Pisa, Italy
- Center
for Instrument Sharing, University of Pisa
(CISUP), 56126Pisa, Italy
| | - Lucia Calucci
- Institute
for the Chemistry of OrganoMetallic Compounds - ICCOM, Italian National Research Council - CNR, via G. Moruzzi 1, 56124Pisa, Italy
- Center
for Instrument Sharing, University of Pisa
(CISUP), 56126Pisa, Italy
| | - Michele Saba
- Department
of Physics, University of Cagliari, S.P. Monserrato-Sestu Km. 0700, 09042Monserrato, Cagliari, Italy
| | - Elisa Carignani
- Institute
for the Chemistry of OrganoMetallic Compounds - ICCOM, Italian National Research Council - CNR, via G. Moruzzi 1, 56124Pisa, Italy
| | - Marco Geppi
- Department
of Chemistry and Industrial Chemistry, University
of Pisa, via G. Moruzzi 13, 56124Pisa, Italy
- Institute
for the Chemistry of OrganoMetallic Compounds - ICCOM, Italian National Research Council - CNR, via G. Moruzzi 1, 56124Pisa, Italy
- Center
for Instrument Sharing, University of Pisa
(CISUP), 56126Pisa, Italy
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4
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Lin CC, Huang SJ, Wu PH, Chen TP, Huang CY, Wang YC, Chen PT, Radeva D, Petrov O, Gelev VM, Sankar R, Chen CC, Chen CW, Yu TY. Direct investigation of the reorientational dynamics of A-site cations in 2D organic-inorganic hybrid perovskite by solid-state NMR. Nat Commun 2022; 13:1513. [PMID: 35314691 PMCID: PMC8938534 DOI: 10.1038/s41467-022-29207-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Accepted: 03/04/2022] [Indexed: 11/09/2022] Open
Abstract
Limited methods are available for investigating the reorientational dynamics of A-site cations in two-dimensional organic–inorganic hybrid perovskites (2D OIHPs), which play a pivotal role in determining their physical properties. Here, we describe an approach to study the dynamics of A-site cations using solid-state NMR and stable isotope labelling. 2H NMR of 2D OIHPs incorporating methyl-d3-ammonium cations (d3-MA) reveals the existence of multiple modes of reorientational motions of MA. Rotational-echo double resonance (REDOR) NMR of 2D OIHPs incorporating 15N- and ¹³C-labeled methylammonium cations (13C,15N-MA) reflects the averaged dipolar coupling between the C and N nuclei undergoing different modes of motions. Our study reveals the interplay between the A-site cation dynamics and the structural rigidity of the organic spacers, so providing a molecular-level insight into the design of 2D OIHPs. The reorientational dynamics of A-site cations in two-dimensional organic-inorganic hybrid perovskites play an important role in determining their physical properties. Here the authors use solid state NMR and isotope labelling to reveal multiple modes of reorientational motions of methylammonium cations and the role of structural rigidity of the organic spacers on their dynamics.
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5
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Zhang B, Wang X, Yang Y, Hu B, Tong L, Zhao L, Lu Q. Novel design strategies for perovskite materials with improved stability and suitable band gaps. Phys Chem Chem Phys 2021; 23:20288-20297. [PMID: 34486002 DOI: 10.1039/d1cp01397a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The instability of organometallic halide perovskites is deemed a key hindrance hampering their commercial utilization in solar cell research. In the current work, we investigate and compare the dynamics properties of both free NH4+ and that immobilized in a NH4+-H2O-H2O-H2O-H2O-NH4+ network in a one-dimensional (1D) Pb-I skeleton. The simulations show that both the space occupancy and the hydrogen bonding formation ability of the A-site groups significantly influence the transition of the 1D NH4PbI3 perovskite materials to two-dimensional/three-dimensional (2D/3D) hybrid structures. Based on these observations, two possible pathways enhancing the structural stability of the perovskite materials are proposed. To narrow the big band gap introduced by the quantum confinement effect in the low-dimensional structures, large metal complexes are introduced as A-site groups considering that metal ions are involved in the formation of both conduction and valence bands of the perovskites. In this way, the band gap of the 1D perovskite materials is narrowed and the structural stability is enhanced accordingly. In addition, by optimizing the ratio of NH4+ to CH6N3+ (GUA+) groups, novel 2D/3D hybrid perovskite materials of (NH4)1-x(GUA)xPbI3 with improved stability and narrower band gaps are suggested as well. These structural design ideas hopefully illuminate the development of innovative and stable perovskite materials.
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Affiliation(s)
- Bing Zhang
- National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing 102206, P. R. China. .,School of New Energy, North China Electric Power University, Beijing 102206, P. R. China
| | - Xiaogang Wang
- School of New Energy, North China Electric Power University, Beijing 102206, P. R. China
| | - Yang Yang
- School of New Energy, North China Electric Power University, Beijing 102206, P. R. China
| | - Bin Hu
- National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing 102206, P. R. China. .,School of New Energy, North China Electric Power University, Beijing 102206, P. R. China
| | - Lei Tong
- School of New Energy, North China Electric Power University, Beijing 102206, P. R. China
| | - Li Zhao
- National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing 102206, P. R. China. .,School of New Energy, North China Electric Power University, Beijing 102206, P. R. China
| | - Qiang Lu
- National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing 102206, P. R. China. .,School of New Energy, North China Electric Power University, Beijing 102206, P. R. China
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6
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NMR spectroscopy probes microstructure, dynamics and doping of metal halide perovskites. Nat Rev Chem 2021; 5:624-645. [PMID: 37118421 DOI: 10.1038/s41570-021-00309-x] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/15/2021] [Indexed: 12/23/2022]
Abstract
Solid-state magic-angle spinning NMR spectroscopy is a powerful technique to probe atomic-level microstructure and structural dynamics in metal halide perovskites. It can be used to measure dopant incorporation, phase segregation, halide mixing, decomposition pathways, passivation mechanisms, short-range and long-range dynamics, and other local properties. This Review describes practical aspects of recording solid-state NMR data on halide perovskites and how these afford unique insights into new compositions, dopants and passivation agents. We discuss the applicability, feasibility and limitations of 1H, 13C, 15N, 14N, 133Cs, 87Rb, 39K, 207Pb, 119Sn, 113Cd, 209Bi, 115In, 19F and 2H NMR in typical experimental scenarios. We highlight the pivotal complementary role of solid-state mechanosynthesis, which enables highly sensitive NMR studies by providing large quantities of high-purity materials of arbitrary complexity and of chemical shifts calculated using density functional theory. We examine the broader impact of solid-state NMR on materials research and how its evolution over seven decades has benefitted structural studies of contemporary materials such as halide perovskites. Finally, we summarize some of the open questions in perovskite optoelectronics that could be addressed using solid-state NMR. We, thereby, hope to stimulate wider use of this technique in materials and optoelectronics research.
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7
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Kim GY, Senocrate A, Wang Y, Moia D, Maier J. Photo-Effect on Ion Transport in Mixed Cation and Halide Perovskites and Implications for Photo-Demixing*. Angew Chem Int Ed Engl 2021; 60:820-826. [PMID: 32876999 PMCID: PMC7839519 DOI: 10.1002/anie.202005853] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Indexed: 11/24/2022]
Abstract
Lead halide perovskites are considered to be most promising photovoltaic materials. Highest efficiency and improved stability of perovskite solar cells have been achieved by using cation and anion mixtures. Experimental information on electronic and ionic charge carriers is key to evaluate device performance, as well as processes of photo-decomposition and photo-demixing which are observed in these materials. Here, we measure ionic and electronic transport properties and investigate various cation and anion substitutions with a special eye on their photo-ionic effect, following our previous study on CH3 NH3 PbI3 , where we found that light enhances not only electronic but also ionic conductivities. We find that this phenomenon is very sensitive to the nature of the halide, while the cationic substitutions are less relevant. Based on the observation that the ionic conductivity enhancement found for iodide perovskites is significantly weakened by bromide substitution, we provide a chemical rationale for the photo-demixing in mixed halide compositions.
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Affiliation(s)
- Gee Yeong Kim
- Physical Chemistry of SolidsMax Planck Institute for Solid State ResearchHeisenbergstrasse 170569StuttgartGermany
| | - Alessandro Senocrate
- Physical Chemistry of SolidsMax Planck Institute for Solid State ResearchHeisenbergstrasse 170569StuttgartGermany
| | - Ya‐Ru Wang
- Physical Chemistry of SolidsMax Planck Institute for Solid State ResearchHeisenbergstrasse 170569StuttgartGermany
| | - Davide Moia
- Physical Chemistry of SolidsMax Planck Institute for Solid State ResearchHeisenbergstrasse 170569StuttgartGermany
| | - Joachim Maier
- Physical Chemistry of SolidsMax Planck Institute for Solid State ResearchHeisenbergstrasse 170569StuttgartGermany
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8
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Kim GY, Senocrate A, Wang Y, Moia D, Maier J. Photo‐Effect on Ion Transport in Mixed Cation and Halide Perovskites and Implications for Photo‐Demixing**. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202005853] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Gee Yeong Kim
- Physical Chemistry of Solids Max Planck Institute for Solid State Research Heisenbergstrasse 1 70569 Stuttgart Germany
| | - Alessandro Senocrate
- Physical Chemistry of Solids Max Planck Institute for Solid State Research Heisenbergstrasse 1 70569 Stuttgart Germany
| | - Ya‐Ru Wang
- Physical Chemistry of Solids Max Planck Institute for Solid State Research Heisenbergstrasse 1 70569 Stuttgart Germany
| | - Davide Moia
- Physical Chemistry of Solids Max Planck Institute for Solid State Research Heisenbergstrasse 1 70569 Stuttgart Germany
| | - Joachim Maier
- Physical Chemistry of Solids Max Planck Institute for Solid State Research Heisenbergstrasse 1 70569 Stuttgart Germany
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9
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Probing the ionic defect landscape in halide perovskite solar cells. Nat Commun 2020; 11:6098. [PMID: 33257707 PMCID: PMC7705665 DOI: 10.1038/s41467-020-19769-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Accepted: 10/29/2020] [Indexed: 11/19/2022] Open
Abstract
Point defects in metal halide perovskites play a critical role in determining their properties and optoelectronic performance; however, many open questions remain unanswered. In this work, we apply impedance spectroscopy and deep-level transient spectroscopy to characterize the ionic defect landscape in methylammonium lead triiodide (MAPbI3) perovskites in which defects were purposely introduced by fractionally changing the precursor stoichiometry. Our results highlight the profound influence of defects on the electronic landscape, exemplified by their impact on the device built-in potential, and consequently, the open-circuit voltage. Even low ion densities can have an impact on the electronic landscape when both cations and anions are considered as mobile. Moreover, we find that all measured ionic defects fulfil the Meyer–Neldel rule with a characteristic energy connected to the underlying ion hopping process. These findings support a general categorization of defects in halide perovskite compounds. Defects in perovskite affect the properties and performance in optoelectronic devices, yet the nature of ionic defects remains elusive. Here, the authors investigate the ionic defect landscape in perovskite introduced by varying precursor stoichiometry, and find the defects fulfill the Meyer-Neldel rule.
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10
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Piveteau L, Morad V, Kovalenko MV. Solid-State NMR and NQR Spectroscopy of Lead-Halide Perovskite Materials. J Am Chem Soc 2020; 142:19413-19437. [PMID: 32986955 PMCID: PMC7677932 DOI: 10.1021/jacs.0c07338] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Indexed: 12/20/2022]
Abstract
Two- and three-dimensional lead-halide perovskite (LHP) materials are novel semiconductors that have generated broad interest owing to their outstanding optical and electronic properties. Characterization and understanding of their atomic structure and structure-property relationships are often nontrivial as a result of the vast structural and compositional tunability of LHPs as well as the enhanced structure dynamics as compared with oxide perovskites or more conventional semiconductors. Nuclear magnetic resonance (NMR) spectroscopy contributes to this thrust through its unique capability of sampling chemical bonding element-specifically (1/2H, 13C, 14/15N, 35/37Cl, 39K, 79/81Br, 87Rb, 127I, 133Cs, and 207Pb nuclei) and locally and shedding light onto the connectivity, geometry, topology, and dynamics of bonding. NMR can therefore readily observe phase transitions, evaluate phase purity and compositional and structural disorder, and probe molecular dynamics and ionic motion in diverse forms of LHPs, in which they can be used practically, ranging from bulk single crystals (e.g., in gamma and X-ray detectors) to polycrystalline films (e.g., in photovoltaics, photodetectors, and light-emitting diodes) and colloidal nanocrystals (e.g., in liquid crystal displays and future quantum light sources). Herein we also outline the immense practical potential of nuclear quadrupolar resonance (NQR) spectroscopy for characterizing LHPs, owing to the strong quadrupole moments, good sensitivity, and high natural abundance of several halide nuclei (79/81Br and 127I) combined with the enhanced electric field gradients around these nuclei existing in LHPs as well as the instrumental simplicity. Strong quadrupole interactions, on one side, make 79/81Br and 127I NMR rather impractical but turn NQR into a high-resolution probe of the local structure around halide ions.
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Affiliation(s)
- Laura Piveteau
- Department
of Chemistry and Applied Biosciences, ETH
Zürich, Vladimir Prelog Weg 1-5, Zurich CH-8093, Switzerland
- Empa-Swiss
Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf CH-8600, Switzerland
- CNRS,
UPR 3079, CEMHTI, Orléans, 45071 Cedex 02, France
| | - Viktoriia Morad
- Department
of Chemistry and Applied Biosciences, ETH
Zürich, Vladimir Prelog Weg 1-5, Zurich CH-8093, Switzerland
- Empa-Swiss
Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf CH-8600, Switzerland
| | - Maksym V. Kovalenko
- Department
of Chemistry and Applied Biosciences, ETH
Zürich, Vladimir Prelog Weg 1-5, Zurich CH-8093, Switzerland
- Empa-Swiss
Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf CH-8600, Switzerland
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11
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Kubicki D, Saski M, MacPherson S, Gal̷kowski K, Lewiński J, Prochowicz D, Titman JJ, Stranks SD. Halide Mixing and Phase Segregation in Cs 2AgBiX 6 (X = Cl, Br, and I) Double Perovskites from Cesium-133 Solid-State NMR and Optical Spectroscopy. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2020; 32:8129-8138. [PMID: 33071455 PMCID: PMC7558408 DOI: 10.1021/acs.chemmater.0c01255] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Revised: 09/16/2020] [Indexed: 05/02/2023]
Abstract
All-inorganic double perovskites (elpasolites) are a promising potential alternatives to lead halide perovskites in optoelectronic applications. Although halide mixing is a well-established strategy for band gap tuning, little is known about halide mixing and phase segregation phenomena in double perovskites. Here, we synthesize a wide range of single- and mixed-halide Cs2AgBiX6 (X = Cl, Br, and I) double perovskites using mechanosynthesis and probe their atomic-level microstructure using 133Cs solid-state MAS NMR. We show that mixed Cl/Br materials form pure phases for any Cl/Br ratio while Cl/I and Br/I mixing is only possible within a narrow range of halide ratios (<3 mol % I) and leads to a complex mixture of products for higher ratios. We characterize the optical properties of the resulting materials and show that halide mixing does not lead to an appreciable tunability of the PL emission. We find that iodide incorporation is particularly pernicious in that it quenches the PL emission intensity and radiative charge carrier lifetimes for iodide ratios as low as 0.3 mol %. Our study shows that solid-state NMR, in conjunction with optical spectroscopies, provides a comprehensive understanding of the structure-activity relationships, halide mixing, and phase segregation phenomena in Cs2AgBiX6 (X = Cl, Br, and I) double perovskites.
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Affiliation(s)
- Dominik
J. Kubicki
- Cavendish
Laboratory, Department of Physics, University
of Cambridge, JJ Thomson Avenue, Cambridge, CB3 0HE, U.K.
- Department
of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge, CB3 0AS, U.K.
| | - Marcin Saski
- Institute
of Physical Chemistry, Polish Academy of
Sciences, Kasprzaka 44/52, Warsaw 01−224, Poland
| | - Stuart MacPherson
- Cavendish
Laboratory, Department of Physics, University
of Cambridge, JJ Thomson Avenue, Cambridge, CB3 0HE, U.K.
- Department
of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge, CB3 0AS, U.K.
| | - Krzysztof Gal̷kowski
- Cavendish
Laboratory, Department of Physics, University
of Cambridge, JJ Thomson Avenue, Cambridge, CB3 0HE, U.K.
- Institute
of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Toruń 87−100, Poland
| | - Janusz Lewiński
- Institute
of Physical Chemistry, Polish Academy of
Sciences, Kasprzaka 44/52, Warsaw 01−224, Poland
- Faculty
of Chemistry, Warsaw University of Technology, Noakowskiego 3, Warsaw 00-664, Poland
| | - Daniel Prochowicz
- Institute
of Physical Chemistry, Polish Academy of
Sciences, Kasprzaka 44/52, Warsaw 01−224, Poland
| | - Jeremy J. Titman
- School
of
Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K.
| | - Samuel D. Stranks
- Cavendish
Laboratory, Department of Physics, University
of Cambridge, JJ Thomson Avenue, Cambridge, CB3 0HE, U.K.
- Department
of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge, CB3 0AS, U.K.
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12
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Karmakar A, Bernard GM, Meldrum A, Oliynyk AO, Michaelis VK. Tailorable Indirect to Direct Band-Gap Double Perovskites with Bright White-Light Emission: Decoding Chemical Structure Using Solid-State NMR. J Am Chem Soc 2020; 142:10780-10793. [PMID: 32426971 DOI: 10.1021/jacs.0c02198] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Efficient white-light-emitting single-material sources are ideal for sustainable lighting applications. Though layered hybrid lead-halide perovskite materials have demonstrated attractive broad-band white-light emission properties, they pose a serious long-term environmental and health risk as they contain lead (Pb2+) and are readily soluble in water. Recently, lead-free halide double perovskite (HDP) materials with a generic formula A(I)2B'(III)B″(I)X6 (where A and B are cations and X is a halide ion) have demonstrated white-light emission with improved photoluminescence quantum yields (PLQYs). Here, we present a series of Bi3+/In3+ mixed-cationic Cs2Bi1-xInxAgCl6 HDP solid solutions that span the indirect to direct band-gap modification which exhibit tailorable optical properties. Density functional theory (DFT) calculations indicate an indirect-direct band-gap crossover composition when x > 0.50. These HDP materials emit over the entire visible light spectrum, centered at 600 ± 30 nm with full-width at half maxima of ca. 200 nm upon ultraviolet light excitation and a maximum PLQY of 34 ± 4% for Cs2Bi0.085In0.915AgCl6. Short-range structural insight for these materials is crucial to unravel the unique atomic-level structural properties which are difficult to distinguish by diffraction-based techniques. Hence, we demonstrate the advantage of using solid-state nuclear magnetic resonance (NMR) spectroscopy to deconvolute the local structural environments of these mixed-cationic HDPs. Using ultrahigh-field (21.14 T) NMR spectroscopy of quadrupolar nuclei (115In, 133Cs, and 209Bi), we show that there is a high degree of atomic-level B'(III)/B″(I) site ordering (i.e., no evidence of antisite defects). Furthermore, a combination of XRD, NMR, and DFT calculations was used to unravel the complete atomic-level random Bi3+/In3+ cationic mixing in Cs2Bi1-xInxAgCl6 HDPs. Briefly, this work provides an advance in understanding the photophysical properties that correlate long- to short-range structural elucidation of these newly developed solid-state white-light emitting HDP materials.
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Affiliation(s)
- Abhoy Karmakar
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Guy M Bernard
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Alkiviathes Meldrum
- Department of Physics, University of Alberta, Edmonton, Alberta T6G 2E1, Canada
| | - Anton O Oliynyk
- Chemistry and Biochemistry Department, Manhattan College, Riverdale, New York 10471, United States
| | - Vladimir K Michaelis
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
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13
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Diao XF, Tang YL, Xiong DY, Wang PR, Gao LK, Tang TY, Wei XN, Zhang HR, Xu-Pu Wu, Ji ST. Study on the properties of perovskite materials under light and different temperatures and electric fields based on DFT. RSC Adv 2020; 10:20960-20971. [PMID: 35692714 PMCID: PMC9122579 DOI: 10.1039/d0ra02841j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Accepted: 05/26/2020] [Indexed: 11/25/2022] Open
Abstract
The photoelectric conversion efficiency of perovskite solar cells has improved rapidly, but their stability is poor, which is an important factor that restricts their commercial production. This paper studies the physical and chemical stability of perovskite solar cells based on first principles. It is well known that methylamido lead iodide compounds and methylamino lead iodide compounds are easily degraded into NH2CH
Created by potrace 1.16, written by Peter Selinger 2001-2019
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NH2I, CH3NH3I and PbI2. First, the chemical stability of the above two perovskite-type solar cell materials is discussed by calculating the binding energy. Then, their phonon scattering lines, state density and thermodynamic properties are calculated and analyzed, and the work functions of different types of crystals along different planes such as [1 0 0], [0 1 0 0], [0 0 1] and [1 1 1] are calculated. The results show that the work function of the methylamine iodized lead compound is greater than that of the methylamidine iodized lead compound, which means that the electrons of the methylamidine iodized lead compound escape more easily and the carrier transfer efficiency is higher under the same conditions. Finally, the effects of different temperatures, different electric fields and light on the two kinds of crystal materials are analyzed. This provides theoretical guidance for us to improve the stability of perovskite materials experimentally. The photoelectric conversion efficiency of perovskite solar cells has improved rapidly, but their stability is poor, which is an important factor that restricts their commercial production.![]()
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Affiliation(s)
- Xin-Feng Diao
- School of Physics, Guizhou University Guiyang 550025 China .,School of Physics and Electronic Sciences, Guizhou Normal College Guiyang 550018 China.,School of Big Data and Information Engineering, Guizhou University Guiyang 550025 China
| | - Yan-Lin Tang
- School of Physics, Guizhou University Guiyang 550025 China
| | - De-Yong Xiong
- School of Physics and Electronic Sciences, Guizhou Normal College Guiyang 550018 China
| | - Ping-Rui Wang
- School of Physics and Electronic Sciences, Guizhou Normal College Guiyang 550018 China
| | - Li-Ke Gao
- School of Physics, Guizhou University Guiyang 550025 China
| | - Tian-Yu Tang
- School of Physics, Guizhou University Guiyang 550025 China
| | - Xiao-Nan Wei
- School of Physics, Guizhou University Guiyang 550025 China
| | - Hai-Rong Zhang
- School of Physics and Electronic Sciences, Guizhou Normal College Guiyang 550018 China
| | - Xu-Pu Wu
- School of Physics and Electronic Sciences, Guizhou Normal College Guiyang 550018 China
| | - Shen-Tong Ji
- School of Physics and Electronic Sciences, Guizhou Normal College Guiyang 550018 China
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14
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Aebli M, Piveteau L, Nazarenko O, Benin BM, Krieg F, Verel R, Kovalenko MV. Lead-Halide Scalar Couplings in 207Pb NMR of APbX 3 Perovskites (A = Cs, Methylammonium, Formamidinium; X = Cl, Br, I). Sci Rep 2020; 10:8229. [PMID: 32427897 PMCID: PMC7237655 DOI: 10.1038/s41598-020-65071-4] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Accepted: 04/20/2020] [Indexed: 11/21/2022] Open
Abstract
Understanding the structure and dynamics of newcomer optoelectronic materials - lead halide perovskites APbX3 [A = Cs, methylammonium (CH3NH3+, MA), formamidinium (CH(NH2)2+, FA); X = Cl, Br, I] - has been a major research thrust. In this work, new insights could be gained by using 207Pb solid-state nuclear magnetic resonance (NMR) spectroscopy at variable temperatures between 100 and 300 K. The existence of scalar couplings 1JPb-Cl of ca. 400 Hz and 1JPb-Br of ca. 2.3 kHz could be confirmed for MAPbX3 and CsPbX3. Diverse and fast structure dynamics, including rotations of A-cations, harmonic and anharmonic vibrations of the lead-halide framework and ionic mobility, affect the resolution of the coupling pattern. 207Pb NMR can therefore be used to detect the structural disorder and phase transitions. Furthermore, by comparing bulk and nanocrystalline CsPbBr3 a greater structural disorder of the PbBr6-octahedra had been confirmed in a nanoscale counterpart, not readily captured by diffraction-based techniques.
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Affiliation(s)
- Marcel Aebli
- Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1-5, CH-8093, Switzerland
- Empa-Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Überlandstrasse 129, CH-8600, Switzerland
| | - Laura Piveteau
- Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1-5, CH-8093, Switzerland
- Empa-Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Überlandstrasse 129, CH-8600, Switzerland
- Conditions Extrêmes et Matériaux: Haute Température et Irradiation (CEMHTI), UPR 3079 CNRS, Université d'Orléans, 1D Avenue de la Recherche Scientifique, 45071, Orléans, France
| | - Olga Nazarenko
- Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1-5, CH-8093, Switzerland
- Empa-Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Überlandstrasse 129, CH-8600, Switzerland
| | - Bogdan M Benin
- Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1-5, CH-8093, Switzerland
- Empa-Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Überlandstrasse 129, CH-8600, Switzerland
| | - Franziska Krieg
- Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1-5, CH-8093, Switzerland
- Empa-Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Überlandstrasse 129, CH-8600, Switzerland
| | - René Verel
- Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1-5, CH-8093, Switzerland.
| | - Maksym V Kovalenko
- Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1-5, CH-8093, Switzerland.
- Empa-Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Überlandstrasse 129, CH-8600, Switzerland.
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15
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Kubicki DJ, Prochowicz D, Salager E, Rakhmatullin A, Grey CP, Emsley L, Stranks SD. Local Structure and Dynamics in Methylammonium, Formamidinium, and Cesium Tin(II) Mixed-Halide Perovskites from 119Sn Solid-State NMR. J Am Chem Soc 2020; 142:7813-7826. [PMID: 32242661 PMCID: PMC7311059 DOI: 10.1021/jacs.0c00647] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
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Organic–inorganic
tin(II) halide perovskites have emerged
as promising alternatives to lead halide perovskites in optoelectronic
applications. While they suffer from considerably poorer performance
and stability in comparison to their lead analogues, their performance
improvements have so far largely been driven by trial and error efforts
due to a critical lack of methods to probe their atomic-level microstructure.
Here, we identify the challenges and devise a 119Sn solid-state
NMR protocol for the determination of the local structure of mixed-cation
and mixed-halide tin(II) halide perovskites as well as their degradation
products and related phases. We establish that the longitudinal relaxation
of 119Sn can span 6 orders of magnitude in this class of
compounds, which makes judicious choice of experimental NMR parameters
essential for the reliable detection of various phases. We show that
Cl/Br and I/Br mixed-halide perovskites form solid alloys in any ratio,
while only limited mixing is possible for I/Cl compositions. We elucidate
the degradation pathways of Cs-, MA-, and FA-based tin(II) halides
and show that degradation leads to highly disordered, qualitatively
similar products, regardless of the A-site cation and halide. We detect
the presence of metallic tin among the degradation products, which
we suggest could contribute to the previously reported high conductivities
in tin(II) halide perovskites. 119Sn NMR chemical shifts
are a sensitive probe of the halide coordination environment as well
as of the A-site cation composition. Finally, we use variable-temperature
multifield relaxation measurements to quantify ion dynamics in MASnBr3 and establish activation energies for motion and show that
this motion leads to spontaneous halide homogenization at room temperature
whenever two different pure-halide perovskites are put in physical
contact.
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Affiliation(s)
- Dominik J Kubicki
- Cavendish Laboratory, Department of Physics (CB3 0HE), University of Cambridge, JJ Thomson Avenue, Cambridge, U.K.,Department of Chemistry (CB2 1EW), University of Cambridge, Lensfield Road, Cambridge, U.K
| | - Daniel Prochowicz
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Elodie Salager
- Conditions Extrêmes et Matériaux: Haute Température et Irradiation (CEMHTI), UPR 3079 CNRS, Université d'Orléans, 1D Avenue de la Recherche Scientifique, Orléans 45071, France.,Réseau sur le Stockage Electrochimique de l'Energie (RS2E), FR 3459 CNRS, 33 Rue Saint Leu, Amiens 80039, France
| | - Aydar Rakhmatullin
- Conditions Extrêmes et Matériaux: Haute Température et Irradiation (CEMHTI), UPR 3079 CNRS, Université d'Orléans, 1D Avenue de la Recherche Scientifique, Orléans 45071, France
| | - Clare P Grey
- Department of Chemistry (CB2 1EW), University of Cambridge, Lensfield Road, Cambridge, U.K
| | - Lyndon Emsley
- Laboratory of Magnetic Resonance, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Samuel D Stranks
- Cavendish Laboratory, Department of Physics (CB3 0HE), University of Cambridge, JJ Thomson Avenue, Cambridge, U.K.,Department of Chemical Engineering and Biotechnology (CB3 0AS), University of Cambridge, Philippa Fawcett Drive, Cambridge, U.K
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16
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Redondo-Obispo C, Suárez I, Quesada SJ, Ripolles TS, Martínez-Pastor JP, Álvarez AL, de Andrés A, Coya C. Enhanced Nonlinear Optical Coefficients of MAPbI 3 Thin Films by Bismuth Doping. J Phys Chem Lett 2020; 11:2188-2194. [PMID: 32068409 DOI: 10.1021/acs.jpclett.0c00319] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The poor photostability under ambient conditions of hybrid halide perovskites has hindered their recently explored promising nonlinear optical properties. Here, we show how Bi3+ can partially substitute Pb2+ homogeneously in the commonly studied MAPbI3, improving both environmental stability and photostability under high laser irradiation. Bi content around 2 atom % produces thin films where the nonlinear refractive (n2) and absorptive coefficients (β), which modify the refractive index (Δn) of the material with light fluence (I), increase up to factors of 4 and 3.5, respectively, compared to undoped MAPbI3. Higher doping inhibits the nonlinear parameters; however, the samples show higher fluence damage thresholds. Thus, these results provide a road map on how MAPbI3 can be engineered for practical cost-effective nonlinear applications by means of Bi doping, including optical limiting devices and multiple-harmonic generation into optoelectronics devices.
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Affiliation(s)
- C Redondo-Obispo
- Escuela Técnica Superior de Ingeniería de Telecomunicación, Universidad Rey Juan Carlos, C/Tulipán s/n, 28933 Madrid, Spain
| | - I Suárez
- Escuela Técnica Superior de Ingeniería de Telecomunicación, Universidad Rey Juan Carlos, C/Tulipán s/n, 28933 Madrid, Spain
- UMDO, Instituto de Ciencia de los Materiales, Universidad de Valencia, 46071 Valencia, Spain
| | - S J Quesada
- Escuela Técnica Superior de Ingeniería de Telecomunicación, Universidad Rey Juan Carlos, C/Tulipán s/n, 28933 Madrid, Spain
| | - T S Ripolles
- Escuela Técnica Superior de Ingeniería de Telecomunicación, Universidad Rey Juan Carlos, C/Tulipán s/n, 28933 Madrid, Spain
| | - J P Martínez-Pastor
- UMDO, Instituto de Ciencia de los Materiales, Universidad de Valencia, 46071 Valencia, Spain
| | - A L Álvarez
- Escuela Técnica Superior de Ingeniería de Telecomunicación, Universidad Rey Juan Carlos, C/Tulipán s/n, 28933 Madrid, Spain
| | - A de Andrés
- Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, C/Sor Juana Inés de la Cruz 3, 28049 Madrid, Spain
| | - Carmen Coya
- Escuela Técnica Superior de Ingeniería de Telecomunicación, Universidad Rey Juan Carlos, C/Tulipán s/n, 28933 Madrid, Spain
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17
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Franssen WMJ, Kentgens APM. Solid-state NMR of hybrid halide perovskites. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2019; 100:36-44. [PMID: 30927717 DOI: 10.1016/j.ssnmr.2019.03.005] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Revised: 03/12/2019] [Accepted: 03/19/2019] [Indexed: 05/18/2023]
Abstract
Recent advances in the development of perovskite based solar cells have increased the demand for in-depth characterisation of the perovskite structures and the dynamics of their various constituents in relation to the potential impact on the photovoltaic performance. NMR can play an important role in this respect; NMR has been used to study the incorporation of different ionic species, characterize their internal dynamics and diffusion, and monitor the chemical stability of these technologically relevant materials, including upcoming lower dimensional perovskite materials. Furthermore, the flexibility of NMR allows the study of the materials under relevant conditions e.g. under illumination. Here we present an overview of the recent literature on NMR of (hybrid) halide perovskites, focusing on the insights that NMR can provide.
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Affiliation(s)
- Wouter M J Franssen
- Magnetic Resonance Research Center, Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525, AJ, Nijmegen, the Netherlands
| | - Arno P M Kentgens
- Magnetic Resonance Research Center, Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525, AJ, Nijmegen, the Netherlands.
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18
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Senocrate A, Maier J. Solid-State Ionics of Hybrid Halide Perovskites. J Am Chem Soc 2019; 141:8382-8396. [PMID: 31017426 PMCID: PMC6727625 DOI: 10.1021/jacs.8b13594] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Indexed: 11/28/2022]
Abstract
Many exciting "anomalies" affecting long-time and low-frequency phenomena in the photoactive halide perovskites that are presently in the focus of the field of photovoltaics turn out to be rather expected from the point of view of solid-state ionics. This Perspective discusses such issues based on the mixed conducting nature of these materials and indicates how the solid-state ionics toolbox can be used to condition and potentially improve these solids. In addition to equilibrium bulk properties, interfacial effects and light effects on the mixed conductivity are considered.
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Affiliation(s)
- Alessandro Senocrate
- Max-Planck-Institut fur Festkorperforschung, Heisenbergstraße 1, Stuttgart 70569, Germany
| | - Joachim Maier
- Max-Planck-Institut fur Festkorperforschung, Heisenbergstraße 1, Stuttgart 70569, Germany
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19
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Determination of the Full 207Pb Chemical Shift Tensor of Anglesite, PbSO4, and Correlation of the Isotropic Shift to Lead–Oxygen Distance in Natural Minerals. CRYSTALS 2019. [DOI: 10.3390/cryst9010043] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The full 207 Pb chemical shift (CS) tensor of lead in the mineral anglesite, PbSO 4 , was determined from orientation-dependent nuclear magnetic resonance (NMR) spectra of a large natural single crystal, using a global fit over two rotation patterns. The resulting tensor is characterised by the reduced anisotropy Δ δ = ( - 327 ± 4 ) ppm, asymmetry η C S = 0 . 529 ± 0 . 002 , and δ i s o = ( - 3615 ± 3 ) ppm, with the isotropic chemical shift δ i s o also verified by magic-angle spinning NMR on a polycrystalline sample. The initially unknown orientation of the mounted single crystal was included in the global data fit as well, thus obtaining it from NMR data only. By use of internal crystal symmetries, the amount of data acquisition and processing for determination of the CS tensor and crystal orientation was reduced. Furthermore, a linear correlation between the 207 Pb isotropic chemical shift and the shortest Pb–O distance in the co-ordination sphere of Pb 2 + solely surrounded by oxygen has been established for a large database of lead-bearing natural minerals.
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20
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Varadwaj PR, Varadwaj A, Marques HM, Yamashita K. Significance of hydrogen bonding and other noncovalent interactions in determining octahedral tilting in the CH 3NH 3PbI 3 hybrid organic-inorganic halide perovskite solar cell semiconductor. Sci Rep 2019; 9:50. [PMID: 30631082 PMCID: PMC6328624 DOI: 10.1038/s41598-018-36218-1] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Accepted: 11/16/2018] [Indexed: 12/19/2022] Open
Abstract
The CH3NH3PbI3 (methylammonium lead triiodide) perovskite semiconductor system has been viewed as a blockbuster research material during the last five years. Because of its complicated architecture, several of its technological, physical and geometrical issues have been examined many times. Yet this has not assisted in overcoming a number of problems in the field nor in enabling the material to be marketed. For instance, these studies have not clarified the nature and type of hydrogen bonding and other noncovalent interactions involved; the origin of hysteresis; the actual role of the methylammonium cation; the nature of polarity associated with the tetragonal geometry; the unusual origin of various frontier orbital contributions to the conduction band minimum; the underlying phenomena of spin-orbit coupling that causes significant bandgap reduction; and the nature of direct-to-indirect bandgap transition features. Arising from many recent reports, it is now a common belief that the I···H–N interaction formed between the inorganic framework and the ammonium group of CH3NH3+ is the only hydrogen bonded interaction responsible for all temperature-dependent geometrical polymorphs of the system, including the most stable one that persists at low-temperatures, and the significance of all other noncovalent interactions has been overlooked. This study focussed only on the low temperature orthorhombic polymorph of CH3NH3PbI3 and CD3ND3PbI3, where D refers deuterium. Together with QTAIM, DORI and RDG based charge density analyses, the results of density functional theory calculations with PBE with and without van der Waals corrections demonstrate that the prevailing view of hydrogen bonding in CH3NH3PbI3 is misleading as it does not alone determine the a−b+a− tilting pattern of the PbI64− octahedra. This study suggests that it is not only the I···H/D–N, but also the I···H/D–C hydrogen/deuterium bonding and other noncovalent interactions (viz. tetrel-, pnictogen- and lump-hole bonding interactions) that are ubiquitous in the orthorhombic CH3NH3PbI3/CD3ND3PbI3 perovskite geometry. Their interplay determines the overall geometry of the polymorph, and are therefore responsible in part for the emergence of the functional optical properties of this material. This study also suggests that these interactions should not be regarded as the sole determinants of octahedral tilting since lattice dynamics is known to play a critical role as well, a common feature in many inorganic perovskites both in the presence and the absence of the encaged cation, as in CsPbI3/WO3 perovskites, for example.
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Affiliation(s)
- Pradeep R Varadwaj
- Department of Chemical System Engineering, School of Engineering, The University of Tokyo 7-3-1, Hongo, Bunkyo-ku, 113-8656, Japan. .,CREST-JST, 7 Gobancho, Chiyoda-ku, Tokyo, 102-0076, Japan. .,The National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, 305-8560, Japan.
| | - Arpita Varadwaj
- Department of Chemical System Engineering, School of Engineering, The University of Tokyo 7-3-1, Hongo, Bunkyo-ku, 113-8656, Japan.,CREST-JST, 7 Gobancho, Chiyoda-ku, Tokyo, 102-0076, Japan.,The National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, 305-8560, Japan
| | - Helder M Marques
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg, 2050, South Africa
| | - Koichi Yamashita
- Department of Chemical System Engineering, School of Engineering, The University of Tokyo 7-3-1, Hongo, Bunkyo-ku, 113-8656, Japan.,CREST-JST, 7 Gobancho, Chiyoda-ku, Tokyo, 102-0076, Japan
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