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Nanoscale heterogeneity of ultrafast many-body carrier dynamics in triple cation perovskites. Nat Commun 2022; 13:6582. [PMID: 36323659 PMCID: PMC9630529 DOI: 10.1038/s41467-022-33935-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Accepted: 10/06/2022] [Indexed: 11/06/2022] Open
Abstract
In high fluence applications of lead halide perovskites for light-emitting diodes and lasers, multi-polaron interactions and associated Auger recombination limit the device performance. However, the relationship of the ultrafast and strongly lattice coupled carrier dynamics to nanoscale heterogeneities has remained elusive. Here, in ultrafast visible-pump infrared-probe nano-imaging of the photoinduced carrier dynamics in triple cation perovskite films, a ~20 % variation in sub-ns relaxation dynamics with spatial disorder on tens to hundreds of nanometer is resolved. We attribute the non-uniform relaxation dynamics to the heterogeneous evolution of polaron delocalization and increasing scattering time. The initial high-density excitation results in faster relaxation due to strong many-body interactions, followed by extended carrier lifetimes at lower densities. These results point towards the missing link between the optoelectronic heterogeneity and associated carrier dynamics to guide synthesis and device engineering for improved perovskites device performance. The optoelectronic performance of lead halide perovskite in highfluence applications are hindered by heterogeneous multi-polaron interactions in the nanoscale. Here, Nishda et al. spatially resolve sub-ns relaxation dynamics on the nanometer scale by ultrafast infrared pumpprobe nanoimaging.
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2
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Cuthriell SA, Panuganti S, Laing CC, Quintero MA, Guzelturk B, Yazdani N, Traore B, Brumberg A, Malliakas CD, Lindenberg AM, Wood V, Katan C, Even J, Zhang X, Kanatzidis MG, Schaller RD. Nonequilibrium Lattice Dynamics in Photoexcited 2D Perovskites. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2202709. [PMID: 36062547 DOI: 10.1002/adma.202202709] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Revised: 08/11/2022] [Indexed: 06/15/2023]
Abstract
Interplay between structural and photophysical properties of metal halide perovskites is critical to their utility in optoelectronics, but there is limited understanding of lattice response upon photoexcitation. Here, 2D perovskites butylammonium lead iodide, (BA)2 PbI4 , and phenethylammonium lead iodide, (PEA)2 PbI4 , are investigated using ultrafast transient X-ray diffraction as a function of optical excitation fluence to discern structural dynamics. Both powder X-ray diffraction and time-resolved photoluminescence linewidths narrow over 1 ns following optical excitation for the fluence range studied, concurrent with slight redshifting of the optical bandgaps. These observations are attributed to transient relaxation and ordering of distorted lead iodide octahedra stimulated mainly by electron-hole pair creation. The c axis expands up to 0.37% over hundreds of picoseconds; reflections sampling the a and b axes undergo one tenth of this expansion with the same timescale. Post-photoexcitation appearance of the (110) reflection in (BA)2 PbI4 would suggest a transient phase transition, however, through new single-crystal XRD, reflections are found that violate glide plane conditions in the reported Pbca structure. The static structure space group is reassigned as P21 21 21 . With this, a nonequilibrium phase transition is ruled out. These findings offer increased understanding of remarkable lattice response in 2D perovskites upon excitation.
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Affiliation(s)
- Shelby A Cuthriell
- Department of Chemistry, Northwestern University, 2145 N. Sheridan Road, Evanston, IL, 60208, USA
| | - Shobhana Panuganti
- Department of Chemistry, Northwestern University, 2145 N. Sheridan Road, Evanston, IL, 60208, USA
| | - Craig C Laing
- Department of Chemistry, Northwestern University, 2145 N. Sheridan Road, Evanston, IL, 60208, USA
| | - Michael A Quintero
- Department of Chemistry, Northwestern University, 2145 N. Sheridan Road, Evanston, IL, 60208, USA
| | - Burak Guzelturk
- X-Ray Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Nuri Yazdani
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
- Department of Information Technology and Electrical Engineering, ETH Zurich, Zurich, 8092, Switzerland
| | - Boubacar Traore
- Univ Rennes, ENSCR, INSA Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes) - UMR 6226, Rennes, F-35000, France
| | - Alexandra Brumberg
- Department of Chemistry, Northwestern University, 2145 N. Sheridan Road, Evanston, IL, 60208, USA
| | - Christos D Malliakas
- Department of Chemistry, Northwestern University, 2145 N. Sheridan Road, Evanston, IL, 60208, USA
| | - Aaron M Lindenberg
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
- Department of Materials Science and Engineering, Stanford University, Stanford, CA, 94305, USA
| | - Vanessa Wood
- Department of Information Technology and Electrical Engineering, ETH Zurich, Zurich, 8092, Switzerland
| | - Claudine Katan
- Univ Rennes, ENSCR, INSA Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes) - UMR 6226, Rennes, F-35000, France
| | - Jacky Even
- Univ Rennes, INSA Rennes, CNRS, Institut FOTON - UMR 6082, Rennes, F-35000, France
| | - Xiaoyi Zhang
- X-Ray Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Mercouri G Kanatzidis
- Department of Chemistry, Northwestern University, 2145 N. Sheridan Road, Evanston, IL, 60208, USA
| | - Richard D Schaller
- Department of Chemistry, Northwestern University, 2145 N. Sheridan Road, Evanston, IL, 60208, USA
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, IL, 60439, USA
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3
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The chemistry and physics of organic—inorganic hybrid perovskite quantum wells. Sci China Chem 2022. [DOI: 10.1007/s11426-022-1389-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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4
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Ma J, Miao TJ, Tang J. Charge carrier dynamics and reaction intermediates in heterogeneous photocatalysis by time-resolved spectroscopies. Chem Soc Rev 2022; 51:5777-5794. [PMID: 35770623 DOI: 10.1039/d1cs01164b] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Sunlight as the most abundant renewable energy holds the promise to make our society sustainable. However, due to its low power density and intermittence, efficient conversion and storage of solar energy as a clean fuel are crucial. Apart from solar fuel synthesis, sunlight can also be used to drive other reactions including organic conversion and air/water purification. Given such potential of photocatalysis, the past few decades have seen a surge in the discovery of photocatalysts. However, the current photocatalytic efficiency is still very moderate. To address this challenge, it is important to understand fundamental factors that dominate the efficiency of a photocatalytic process to enable the rational design and development of photocatalytic systems. Many recent studies highlighted transient absorption spectroscopy (TAS) and time-resolved infrared (TRIR) spectroscopy as powerful approaches to characterise charge carrier dynamics and reaction pathways to elucidate the reasons behind low photocatalytic efficiencies, and to rationalise photocatalytic activities exhibited by closely related materials. Accordingly, as a fast-moving area, the past decade has witnessed an explosion in reports on charge carrier dynamics and reaction mechanisms on a wide range of photocatalytic materials. This critical review will discuss the application of TAS and TRIR in a wide range of heterogeneous photocatalytic systems, demonstrating the variety of ways in which these techniques can be used to understand the correlation between materials design, charge carrier behaviour, and photocatalytic activity. Finally, it provides a comprehensive outlook for potential developments in the area of time-resolved spectroscopies with an aim to provide design strategies for photocatalysts.
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Affiliation(s)
- Jiani Ma
- Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education, and the Energy and Catalysis Hub, College of Chemistry and Materials Science, Northwest University, Xi'an, P. R. China
| | - Tina Jingyan Miao
- Department of Chemical Engineering, University College London (UCL), WC1E 7JE, London, UK.,Department of Chemistry, University College London (UCL), WC1H 0AJ, London, UK.
| | - Junwang Tang
- Department of Chemical Engineering, University College London (UCL), WC1E 7JE, London, UK
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5
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Rakowski R, Fisher W, Calbo J, Mokhtar MZ, Liang X, Ding D, Frost JM, Haque SA, Walsh A, Barnes PRF, Nelson J, van Thor JJ. High Power Irradiance Dependence of Charge Species Dynamics in Hybrid Perovskites and Kinetic Evidence for Transient Vibrational Stark Effect in Formamidinium. NANOMATERIALS 2022; 12:nano12101616. [PMID: 35630839 PMCID: PMC9146680 DOI: 10.3390/nano12101616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Revised: 04/04/2022] [Accepted: 04/15/2022] [Indexed: 02/05/2023]
Abstract
Hybrid halide perovskites materials have the potential for both photovoltaic and light-emitting devices. Relatively little has been reported on the kinetics of charge relaxation upon intense excitation. In order to evaluate the illumination power density dependence on the charge recombination mechanism, we have applied a femtosecond transient mid-IR absorption spectroscopy with strong excitation to directly measure the charge kinetics via electron absorption. The irradiance-dependent relaxation processes of the excited, photo-generated charge pairs were quantified in polycrystalline MAPbI3, MAPbBr3, and (FAPbI3)0.97(MAPbBr3)0.03 thin films that contain either methylamonium (MA) or formamidinium (FA). This report identifies the laser-generated charge species and provides the kinetics of Auger, bimolecular and excitonic decay components. The inter-band electron-hole (bimolecular) recombination was found to dominate over Auger recombination at very high pump irradiances, up to the damage threshold. The kinetic analysis further provides direct evidence for the carrier field origin of the vibrational Stark effect in a formamidinium containing perovskite material. The results suggest that radiative excitonic and bimolecular recombination in MAPbI3 at high excitation densities could support light-emitting applications.
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Affiliation(s)
- Rafal Rakowski
- Life Science Department, Imperial College London, London SW7 2AZ, UK;
| | - William Fisher
- Department of Physics, Imperial College London, London SW7 2AZ, UK; (W.F.); (J.M.F.); (P.R.F.B.); (J.N.)
| | - Joaquín Calbo
- Department of Materials, Imperial College London, London SW7 2AZ, UK; (J.C.); (A.W.)
| | - Muhamad Z. Mokhtar
- School of Materials, University of Manchester, MSS Tower, Manchester M13 9PL, UK;
| | - Xinxing Liang
- Department of Chemistry, Centre for Plastic Electronics, Imperial College London, London W12 0BZ, UK; (X.L.); (D.D.); (S.A.H.)
| | - Dong Ding
- Department of Chemistry, Centre for Plastic Electronics, Imperial College London, London W12 0BZ, UK; (X.L.); (D.D.); (S.A.H.)
| | - Jarvist M. Frost
- Department of Physics, Imperial College London, London SW7 2AZ, UK; (W.F.); (J.M.F.); (P.R.F.B.); (J.N.)
| | - Saif A. Haque
- Department of Chemistry, Centre for Plastic Electronics, Imperial College London, London W12 0BZ, UK; (X.L.); (D.D.); (S.A.H.)
| | - Aron Walsh
- Department of Materials, Imperial College London, London SW7 2AZ, UK; (J.C.); (A.W.)
| | - Piers R. F. Barnes
- Department of Physics, Imperial College London, London SW7 2AZ, UK; (W.F.); (J.M.F.); (P.R.F.B.); (J.N.)
| | - Jenny Nelson
- Department of Physics, Imperial College London, London SW7 2AZ, UK; (W.F.); (J.M.F.); (P.R.F.B.); (J.N.)
| | - Jasper J. van Thor
- Life Science Department, Imperial College London, London SW7 2AZ, UK;
- Correspondence:
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6
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Li S, Dai Z, Li L, Padture NP, Guo P. Time-resolved vibrational-pump visible-probe spectroscopy for thermal conductivity measurement of metal-halide perovskites. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2022; 93:053003. [PMID: 35649796 DOI: 10.1063/5.0083763] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Understanding thermal transport at the microscale to the nanoscale is crucially important for a wide range of technologies ranging from device thermal management and protection systems to thermal-energy regulation and harvesting. In the past decades, non-contact optical methods, such as time-domain and frequency-domain thermoreflectance, have emerged as extremely powerful and versatile thermal metrological techniques for the measurement of material thermal conductivities. Here, we report the measurement of thermal conductivity of thin films of CH3NH3PbI3 (MAPbI3), a prototypical metal-halide perovskite, by developing a time-resolved optical technique called vibrational-pump visible-probe (VPVP) spectroscopy. The VPVP technique relies on the direct thermal excitation of MAPbI3 by femtosecond mid-infrared optical pump pulses that are wavelength-tuned to a vibrational mode of the material, after which the time dependent optical transmittance across the visible range is probed in the ns to the μs time window using a broadband pulsed laser. Using the VPVP method, we determine the thermal conductivities of MAPbI3 thin films deposited on different substrates. The transducer-free VPVP method reported here is expected to permit spectrally resolving and spatiotemporally imaging of the dynamic lattice temperature variations in organic, polymeric, and hybrid organic-inorganic semiconductors.
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Affiliation(s)
- Shunran Li
- Department of Chemical and Environmental Engineering, Yale University, 9 Hillhouse Avenue, New Haven, Connecticut 06520, USA
| | - Zhenghong Dai
- School of Engineering, Brown University, Providence, Rhode Island 02912, USA
| | - Linda Li
- Department of Chemical and Environmental Engineering, Yale University, 9 Hillhouse Avenue, New Haven, Connecticut 06520, USA
| | - Nitin P Padture
- School of Engineering, Brown University, Providence, Rhode Island 02912, USA
| | - Peijun Guo
- Department of Chemical and Environmental Engineering, Yale University, 9 Hillhouse Avenue, New Haven, Connecticut 06520, USA
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7
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Time-resolved infrared absorption spectroscopy applied to photoinduced reactions: how and why. Photochem Photobiol Sci 2022; 21:557-584. [DOI: 10.1007/s43630-022-00180-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2021] [Accepted: 01/28/2022] [Indexed: 10/19/2022]
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8
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Ptak M, Sieradzki A, Šimėnas M, Maczka M. Molecular spectroscopy of hybrid organic–inorganic perovskites and related compounds. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.214180] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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9
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Lu TF, Wang YS, Tomko JA, Hopkins PE, Zhang HX, Prezhdo OV. Control of Charge Carrier Dynamics in Plasmonic Au Films by TiO x Substrate Stoichiometry. J Phys Chem Lett 2020; 11:1419-1427. [PMID: 32011143 DOI: 10.1021/acs.jpclett.9b03884] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Plasmonic excitations in noble metals have many fascinating properties and give rise to a broad range of applications. We demonstrate, using nonadiabatic molecular dynamics combined with time-domain density functional theory, that the chemical composition and stoichiometry of substrates can have a strong influence on charge dynamics. By changing oxygen content in TiO2, including stoichiometric, oxygen rich, and oxygen poor phases, and Ti metal, one can alter lifetimes of charge carriers in Au by a factor of 5 and control the ratio of electron-to-hole relaxation rates by a factor of 10. Remarkably, a thin TiOx substrate greatly alters charge carrier properties in much thicker Au films. Such large variations stem from the fact that the Ti and O atoms are much lighter than Au, and their vibrations are much faster at dissipating the energy. The control over a particular charge carrier and an energy range depends on the Au and TiOx level alignment, and the interfacial interaction strength. These factors are easily influenced by the TiOx stoichiometry. In particular, oxygen rich and poor TiO2 can be used to control holes and electrons, respectively, while metallic Ti affects both charge carriers. The detailed atomistic analysis of the interfacial and electron-vibrational interactions generates the fundamental understanding of the properties of plasmonic materials needed to design photovoltaic, photocatalytic, optoelectronic, sensing, nanomedical, and other devices.
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Affiliation(s)
- Teng-Fei Lu
- Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry , Jilin University , Changchun 130023 , People's Republic of China
- Department of Chemistry , University of Southern California , Los Angeles , California 90089 , United States
| | - Yi-Siang Wang
- Department of Chemistry , University of Southern California , Los Angeles , California 90089 , United States
| | - John A Tomko
- Department of Materials Science and Engineering , University of Virginia , Charlottesville , Virginia 22904 , United States
| | - Patrick E Hopkins
- Department of Materials Science and Engineering , University of Virginia , Charlottesville , Virginia 22904 , United States
- Department of Mechanical and Aerospace Engineering , University of Virginia , Charlottesville , Virginia 22904 , United States
- Department of Physics , University of Virginia , Charlottesville , Virginia 22904 , United States
| | - Hong-Xing Zhang
- Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry , Jilin University , Changchun 130023 , People's Republic of China
| | - Oleg V Prezhdo
- Department of Chemistry , University of Southern California , Los Angeles , California 90089 , United States
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10
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Diroll BT, Mannodi-Kanakkithodi A, Chan MKY, Schaller RD. Spectroscopic Comparison of Thermal Transport at Organic-Inorganic and Organic-Hybrid Interfaces Using CsPbBr 3 and FAPbBr 3 (FA = Formamidinium) Perovskite Nanocrystals. NANO LETTERS 2019; 19:8155-8160. [PMID: 31603685 DOI: 10.1021/acs.nanolett.9b03502] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Thermal transport across interfaces depends on the matching of vibrational structure at the interface. This work examines the transfer of thermal excitation from an organic ligand coating to either all-inorganic cesium lead tribromide (CsPbBr3) nanocrystals or hybrid organic-inorganic formamidinium lead tribromide (FAPbBr3) nanocrystals using selective infrared optical excitation. These two semiconductors are directly compared because they (or similar semiconductors) are currently envisioned as strong candidates in many optoelectronic technologies and they differ due to the presence of an organic or inorganic cation, which introduces substantial differences in the phonon density of states in otherwise quite similar semiconductors. Infrared excitation of C-H vibrations of surface-bound ligands generates a temperature gradient between the organic ligand shell and nanocrystal core, which results in heat flow, measured by probing changes of the semiconductor band gap. Heat transfer to both perovskite compositions of comparable sizes is similar (25-30 ps), due to fast intramolecular vibrational relaxation and similar matching of low-energy phonons with the organic ligand, but FAPbBr3 samples show a slow bleaching kinetic on the order of 1 ns. This slow, heat-induced change in the semiconductor band gap is attributed not to interfacial heat transfer but instead to thermal equilibration between the organic and inorganic sublattices of FAPbBr3. Ab initio molecular dynamics simulations support the hypothesis that low-energy inorganic sublattice phonon modes are populated initially in the heat transfer process, with a slow thermal population of the higher-energy phonon modes associated primarily with the organic cation. Slow thermal equilibration of FAPbBr3 is likely to substantially impact the time-dependent response of optoelectronic devices that heat the semiconductor active layer and provide further evidence that the poor bulk thermal transport of hybrid perovskite materials extends to microscopic thermal processes.
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Affiliation(s)
- Benjamin T Diroll
- Center for Nanoscale Materials , Argonne National Laboratory , 9700 South Cass Avenue , Lemont , Illinois 60439 , United States
| | - Arun Mannodi-Kanakkithodi
- Center for Nanoscale Materials , Argonne National Laboratory , 9700 South Cass Avenue , Lemont , Illinois 60439 , United States
| | - Maria K Y Chan
- Center for Nanoscale Materials , Argonne National Laboratory , 9700 South Cass Avenue , Lemont , Illinois 60439 , United States
| | - Richard D Schaller
- Center for Nanoscale Materials , Argonne National Laboratory , 9700 South Cass Avenue , Lemont , Illinois 60439 , United States
- Department of Chemistry , Northwestern University , 2145 Sheridan Avenue , Evanston , Illinois 60208 , United States
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11
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Diroll BT, Kirschner MS, Guo P, Schaller RD. Optical and Physical Probing of Thermal Processes in Semiconductor and Plasmonic Nanocrystals. Annu Rev Phys Chem 2019; 70:353-377. [DOI: 10.1146/annurev-physchem-042018-052639] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
This article reviews thermal properties of semiconductor and emergent plasmonic nanomaterials, focusing on mechanisms through which hot carriers and phonons are produced and dissipated as well as the related impacts on optoelectronic properties. Elevated equilibrium temperatures, of particular relevance for implementation of nanomaterials in devices, affect absorptive and radiative transitions as well as emission efficiency that can present reversible and irreversible changes with temperature. In noble metal or doped semiconductor/insulator nanomaterials, hot carriers and lattice heating can substantially influence localized surface plasmon resonances and yield large ultrafast changes in transmission or strongly oscillatory coherences. Transient optical and diffraction characterizations enable nonequilibrium investigations of phonon dynamics and cooling such as lattice expansion and crystal phase stability. Timescales of nanoparticle thermalization with surroundings and transport of heat within films of such materials are also discussed.
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Affiliation(s)
- Benjamin T. Diroll
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | | | - Peijun Guo
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - Richard D. Schaller
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, USA
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA
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12
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Photoinduced, reversible phase transitions in all-inorganic perovskite nanocrystals. Nat Commun 2019; 10:504. [PMID: 30700706 PMCID: PMC6353988 DOI: 10.1038/s41467-019-08362-3] [Citation(s) in RCA: 68] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2018] [Accepted: 12/26/2018] [Indexed: 11/26/2022] Open
Abstract
Significant interest exists in lead trihalides that present the perovskite structure owing to their demonstrated potential in photovoltaic, lasing, and display applications. These materials are also notable for their unusual phase behavior often displaying easily accessible phase transitions. In this work, time-resolved X-ray diffraction, performed on perovskite cesium lead bromide nanocrystals, maps the lattice response to controlled excitation fluence. These nanocrystals undergo a reversible, photoinduced orthorhombic-to-cubic phase transition which is discernible at fluences greater than 0.34 mJ cm−2 through the loss of orthorhombic features and shifting of high-symmetry peaks. This transition recovers on the timescale of 510 ± 100 ps. A reversible crystalline-to-amorphous transition, observable through loss of Bragg diffraction intensity, occurs at higher fluences (greater than 2.5 mJ cm−2). These results demonstrate that light-driven phase transitions occur in perovskite materials, which will impact optoelectronic applications and enable the manipulation of non-equilibrium phase characteristics of the broad perovskite material class. Lead trihalide perovskites are notable for their excellent optoelectronic properties and uncommon phase behavior. Here, Kirschner et al. show that cesium lead bromide nanocrystals experience a reversible orthorhombic-to-cubic phase transition at moderate excitation fluences and become amorphous at higher fluences.
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13
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Infrared-pump electronic-probe of methylammonium lead iodide reveals electronically decoupled organic and inorganic sublattices. Nat Commun 2019; 10:482. [PMID: 30696817 PMCID: PMC6351559 DOI: 10.1038/s41467-019-08363-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Accepted: 12/28/2018] [Indexed: 11/09/2022] Open
Abstract
Organic-inorganic hybrid perovskites such as methylammonium lead iodide (CH3NH3PbI3) are game-changing semiconductors for solar cells and light-emitting devices owing to their defect tolerance and exceptionally long carrier lifetimes and diffusion lengths. Determining whether the dynamically disordered organic cations with large dipole moment benefit the optoelectronic properties of CH3NH3PbI3 has been an outstanding challenge. Herein, via transient absorption measurements employing an infrared pump pulse tuned to a methylammonium vibration, we observe slow, nanosecond-long thermal dissipation from the selectively excited organic mode to the inorganic sublattice. The resulting transient electronic signatures, during the period of thermal-nonequilibrium when the induced thermal motions are mostly concentrated on the organic sublattice, reveal that the induced atomic motions of the organic cations do not alter the absorption or the photoluminescence response of CH3NH3PbI3, beyond thermal effects. Our results suggest that the attractive optoelectronic properties of CH3NH3PbI3 mainly derive from the inorganic lead-halide framework.
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14
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Shayapov VR, Usoltsev AN, Adonin SA, Sokolov MN, Samsonenko DG, Fedin VP. Thermochromism of bromotellurates(iv): experimental insights. NEW J CHEM 2019. [DOI: 10.1039/c9nj00320g] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Thermally induced changes in optical properties (thermochromism) in an extended series of 16 bromotellurate(iv) complexes were investigated; regularities valid for this class of compounds were established.
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Affiliation(s)
| | | | - Sergey A. Adonin
- Nikolaev Institute of Inorganic Chemistry SB RAS
- Novosibirsk
- Russia
- Novosibirsk State University
- Novosibirsk
| | - Maxim N. Sokolov
- Nikolaev Institute of Inorganic Chemistry SB RAS
- Novosibirsk
- Russia
- Novosibirsk State University
- Novosibirsk
| | - Denis G. Samsonenko
- Nikolaev Institute of Inorganic Chemistry SB RAS
- Novosibirsk
- Russia
- Novosibirsk State University
- Novosibirsk
| | - Vladimir P. Fedin
- Nikolaev Institute of Inorganic Chemistry SB RAS
- Novosibirsk
- Russia
- Novosibirsk State University
- Novosibirsk
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15
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Diroll BT, Guo P, Schaller RD. Heat Transfer at Hybrid Interfaces: Interfacial Ligand-to-Nanocrystal Heating Monitored with Infrared Pump, Electronic Probe Spectroscopy. NANO LETTERS 2018; 18:7863-7869. [PMID: 30431280 DOI: 10.1021/acs.nanolett.8b03640] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The transfer of thermal energy from the ligand passivating layer to the inorganic core of colloidal nanocrystals is observed using infrared-pump, electronic-probe (IPEP) spectroscopy. Inorganic nanocrystals are excellent model systems for organic-inorganic hybrid interfaces as they have much larger surface-to-volume ratios than bulk solids, which facilitate spectroscopic measurements of weak signals. Such interfaces between disparate materials are challenging to probe by traditional methods. Here, resonant excitation of the hydrocarbon ligand vibrational absorptions results in a transient red-shift of the CdSe nanocrystal excitonic features consistent with heating, as demonstrated by steady-state absorption measurements, which provide a calibration of the pump-induced temperature rise. The time constant associated with heating ranges from 10 to 30 ps depending on the sample morphology, static temperature, input fluence, and environment, all of which are studied in this work. Heat transfer speeds up and the magnitude of nanocrystal heating decreases at higher temperatures. Unlike chemical modulation of electrical conductivity, ligand exchange for several common organic ligands does not dramatically change the interfacial conductivity of the nanocrystal-ligand interface. However, changes in the medium (e.g., solvent) do change the rate of heat outcoupling from the nanocrystal-ligand complex. Although applied here to nanocrystals to measure interfacial heat transfer, IPEP spectroscopy is readily applicable for any heterogeneous system in which one component has spectrally isolated molecular vibrations or lattice phonons.
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Affiliation(s)
- Benjamin T Diroll
- Center for Nanoscale Materials , Argonne National Laboratory , Lemont , Illinois 60439 , United States
| | - Peijun Guo
- Center for Nanoscale Materials , Argonne National Laboratory , Lemont , Illinois 60439 , United States
| | - Richard D Schaller
- Center for Nanoscale Materials , Argonne National Laboratory , Lemont , Illinois 60439 , United States
- Department of Chemistry , Northwestern University , Evanston , Illinois 60208 , United States
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