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Hot carriers perspective on the nature of traps in perovskites
Amongst the many spectacular properties of hybrid lead halide perovskites, their defect tolerance is regarded as the key enabler for a spectrum of high-performance optoelectronic devices that propel perovskites to prominence. However, the plateauing efficiency enhancement of perovskite devices calls...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7264280/ https://www.ncbi.nlm.nih.gov/pubmed/32483150 http://dx.doi.org/10.1038/s41467-020-16463-7 |
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author | Righetto, Marcello Lim, Swee Sien Giovanni, David Lim, Jia Wei Melvin Zhang, Qiannan Ramesh, Sankaran Tay, Yong Kang Eugene Sum, Tze Chien |
author_facet | Righetto, Marcello Lim, Swee Sien Giovanni, David Lim, Jia Wei Melvin Zhang, Qiannan Ramesh, Sankaran Tay, Yong Kang Eugene Sum, Tze Chien |
author_sort | Righetto, Marcello |
collection | PubMed |
description | Amongst the many spectacular properties of hybrid lead halide perovskites, their defect tolerance is regarded as the key enabler for a spectrum of high-performance optoelectronic devices that propel perovskites to prominence. However, the plateauing efficiency enhancement of perovskite devices calls into question the extent of this defect tolerance in perovskite systems; an opportunity for perovskite nanocrystals to fill. Through optical spectroscopy and phenomenological modeling based on the Marcus theory of charge transfer, we uncover the detrimental effect of hot carriers trapping in methylammonium lead iodide and bromide nanocrystals. Higher excess energies induce faster carrier trapping rates, ascribed to interactions with shallow traps and ligands, turning these into potent defects. Passivating these traps with the introduction of phosphine oxide ligands can help mitigate hot carrier trapping. Importantly, our findings extend beyond photovoltaics and are relevant for low threshold lasers, light-emitting devices and multi-exciton generation devices. |
format | Online Article Text |
id | pubmed-7264280 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-72642802020-06-12 Hot carriers perspective on the nature of traps in perovskites Righetto, Marcello Lim, Swee Sien Giovanni, David Lim, Jia Wei Melvin Zhang, Qiannan Ramesh, Sankaran Tay, Yong Kang Eugene Sum, Tze Chien Nat Commun Article Amongst the many spectacular properties of hybrid lead halide perovskites, their defect tolerance is regarded as the key enabler for a spectrum of high-performance optoelectronic devices that propel perovskites to prominence. However, the plateauing efficiency enhancement of perovskite devices calls into question the extent of this defect tolerance in perovskite systems; an opportunity for perovskite nanocrystals to fill. Through optical spectroscopy and phenomenological modeling based on the Marcus theory of charge transfer, we uncover the detrimental effect of hot carriers trapping in methylammonium lead iodide and bromide nanocrystals. Higher excess energies induce faster carrier trapping rates, ascribed to interactions with shallow traps and ligands, turning these into potent defects. Passivating these traps with the introduction of phosphine oxide ligands can help mitigate hot carrier trapping. Importantly, our findings extend beyond photovoltaics and are relevant for low threshold lasers, light-emitting devices and multi-exciton generation devices. Nature Publishing Group UK 2020-06-01 /pmc/articles/PMC7264280/ /pubmed/32483150 http://dx.doi.org/10.1038/s41467-020-16463-7 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Righetto, Marcello Lim, Swee Sien Giovanni, David Lim, Jia Wei Melvin Zhang, Qiannan Ramesh, Sankaran Tay, Yong Kang Eugene Sum, Tze Chien Hot carriers perspective on the nature of traps in perovskites |
title | Hot carriers perspective on the nature of traps in perovskites |
title_full | Hot carriers perspective on the nature of traps in perovskites |
title_fullStr | Hot carriers perspective on the nature of traps in perovskites |
title_full_unstemmed | Hot carriers perspective on the nature of traps in perovskites |
title_short | Hot carriers perspective on the nature of traps in perovskites |
title_sort | hot carriers perspective on the nature of traps in perovskites |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7264280/ https://www.ncbi.nlm.nih.gov/pubmed/32483150 http://dx.doi.org/10.1038/s41467-020-16463-7 |
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