Kashtiban, RJ, Patrick, CE, Ramasse, Q orcid.org/0000-0001-7466-2283 et al. (2 more authors) (2023) Picoperovskites: the Smallest Conceivable Isolated Halide Perovskite Structures Formed Within Carbon Nanotubes. Advanced Materials, 35 (10). e2208575. ISSN 0935-9648
Abstract
Halide perovskite structures are revolutionising the design of optoelectronic materials, including solar cells, light emitting diodes and photovoltaics when formed at the quantum scale. We report four isolated sub-nm, or pico-scale, halide perovskite structures formed inside ∼1.2-1.6 nm single walled carbon nanotubes (SWCNTs) by melt insertion from CsPbBr3 and lead-free CsSnI3. Three directly relate to the ABX3 perovskite archetype while a fourth is a perovskite-like lamellar structure with alternating Cs4 and polyhedral Sn4Ix layers. In ∼1.4 nm diameter SWCNTs, CsPbBr3 forms Cs3PbIIBr5 nanowires one ABX3 unit cell in cross section with the Pb2+ oxidation state maintained by ordered Cs+ vacancies. Within ∼1.2 nm diameter SWCNTs, CsPbBr3 and CsSnI3 form inorganic polymer-like bilayer structures 1/4 an ABX3 unit cell in cross-section with systematically reproduced ABX3 stoichiometry. Producing these smallest halide perovskite structures at their absolute synthetic cross-sectional limit enables quantum confinement effects with first-principles calculations demonstrating band gap widening compared to corresponding bulk structural forms.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2023 The Authors. Advanced Materials published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
Keywords: | Carbon Nanotubes; Density Functional Theory; Electron Microscopy; Halide Perovskites; Nanowires; Picoscale Materials |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 13 Jan 2023 14:57 |
Last Modified: | 12 Apr 2023 14:34 |
Status: | Published |
Publisher: | Wiley |
Identification Number: | 10.1002/adma.202208575 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:195174 |