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Role of Microstructure in the Electron-Hole Interaction of Hybrid Lead-Halide Perovskites
Solar cells based on hybrid inorganic-organic halide perovskites have demonstrated high power conversion efficiencies in a range of architectures. The existence and stability of bound electron-hole pairs in these materials, and their role in the exceptional performance of optoelectronic devices, rem...
Autores principales: | , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4591469/ https://www.ncbi.nlm.nih.gov/pubmed/26442125 http://dx.doi.org/10.1038/nphoton.2015.151 |
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author | Grancini, Giulia Srimath Kandada, Ajay Ram Frost, Jarvist M. Barker, Alex J. De Bastiani, Michele Gandini, Marina Marras, Sergio Lanzani, Guglielmo Walsh, Aron Petrozza, Annamaria |
author_facet | Grancini, Giulia Srimath Kandada, Ajay Ram Frost, Jarvist M. Barker, Alex J. De Bastiani, Michele Gandini, Marina Marras, Sergio Lanzani, Guglielmo Walsh, Aron Petrozza, Annamaria |
author_sort | Grancini, Giulia |
collection | PubMed |
description | Solar cells based on hybrid inorganic-organic halide perovskites have demonstrated high power conversion efficiencies in a range of architectures. The existence and stability of bound electron-hole pairs in these materials, and their role in the exceptional performance of optoelectronic devices, remains a controversial issue. Here we demonstrate, through a combination of optical spectroscopy and multiscale modeling as a function of the degree of polycrystallinity and temperature, that the electron-hole interaction is sensitive to the microstructure of the material. The long-range order is disrupted by polycrystalline disorder and the variations in electrostatic potential found for smaller crystals suppress exciton formation, while larger crystals of the same composition demonstrate an unambiguous excitonic state. We conclude that fabrication procedures and morphology strongly influence perovskite behaviour, with both free carrier and excitonic regimes possible, with strong implications for optoelectronic devices. |
format | Online Article Text |
id | pubmed-4591469 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
record_format | MEDLINE/PubMed |
spelling | pubmed-45914692016-04-01 Role of Microstructure in the Electron-Hole Interaction of Hybrid Lead-Halide Perovskites Grancini, Giulia Srimath Kandada, Ajay Ram Frost, Jarvist M. Barker, Alex J. De Bastiani, Michele Gandini, Marina Marras, Sergio Lanzani, Guglielmo Walsh, Aron Petrozza, Annamaria Nat Photonics Article Solar cells based on hybrid inorganic-organic halide perovskites have demonstrated high power conversion efficiencies in a range of architectures. The existence and stability of bound electron-hole pairs in these materials, and their role in the exceptional performance of optoelectronic devices, remains a controversial issue. Here we demonstrate, through a combination of optical spectroscopy and multiscale modeling as a function of the degree of polycrystallinity and temperature, that the electron-hole interaction is sensitive to the microstructure of the material. The long-range order is disrupted by polycrystalline disorder and the variations in electrostatic potential found for smaller crystals suppress exciton formation, while larger crystals of the same composition demonstrate an unambiguous excitonic state. We conclude that fabrication procedures and morphology strongly influence perovskite behaviour, with both free carrier and excitonic regimes possible, with strong implications for optoelectronic devices. 2015-10-01 /pmc/articles/PMC4591469/ /pubmed/26442125 http://dx.doi.org/10.1038/nphoton.2015.151 Text en http://www.nature.com/authors/editorial_policies/license.html#terms Users may view, print, copy, and download text and data-mine the content in such documents, for the purposes of academic research, subject always to the full Conditions of use:http://www.nature.com/authors/editorial_policies/license.html#terms |
spellingShingle | Article Grancini, Giulia Srimath Kandada, Ajay Ram Frost, Jarvist M. Barker, Alex J. De Bastiani, Michele Gandini, Marina Marras, Sergio Lanzani, Guglielmo Walsh, Aron Petrozza, Annamaria Role of Microstructure in the Electron-Hole Interaction of Hybrid Lead-Halide Perovskites |
title | Role of Microstructure in the Electron-Hole Interaction of Hybrid Lead-Halide Perovskites |
title_full | Role of Microstructure in the Electron-Hole Interaction of Hybrid Lead-Halide Perovskites |
title_fullStr | Role of Microstructure in the Electron-Hole Interaction of Hybrid Lead-Halide Perovskites |
title_full_unstemmed | Role of Microstructure in the Electron-Hole Interaction of Hybrid Lead-Halide Perovskites |
title_short | Role of Microstructure in the Electron-Hole Interaction of Hybrid Lead-Halide Perovskites |
title_sort | role of microstructure in the electron-hole interaction of hybrid lead-halide perovskites |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4591469/ https://www.ncbi.nlm.nih.gov/pubmed/26442125 http://dx.doi.org/10.1038/nphoton.2015.151 |
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