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Multiple Exciton Generation in Colloidal Nanocrystals
In a conventional solar cell, the energy of an absorbed photon in excess of the band gap is rapidly lost as heat, and this is one of the main reasons that the theoretical efficiency is limited to ~33%. However, an alternative process, multiple exciton generation (MEG), can occur in colloidal quantum...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2013
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5304609/ https://www.ncbi.nlm.nih.gov/pubmed/28348283 http://dx.doi.org/10.3390/nano4010019 |
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author | Smith, Charles Binks, David |
author_facet | Smith, Charles Binks, David |
author_sort | Smith, Charles |
collection | PubMed |
description | In a conventional solar cell, the energy of an absorbed photon in excess of the band gap is rapidly lost as heat, and this is one of the main reasons that the theoretical efficiency is limited to ~33%. However, an alternative process, multiple exciton generation (MEG), can occur in colloidal quantum dots. Here, some or all of the excess energy is instead used to promote one or more additional electrons to the conduction band, potentially increasing the photocurrent of a solar cell and thereby its output efficiency. This review will describe the development of this field over the decade since the first experimental demonstration of multiple exciton generation, including the controversies over experimental artefacts, comparison with similar effects in bulk materials, and the underlying mechanisms. We will also describe the current state-of-the-art and outline promising directions for further development. |
format | Online Article Text |
id | pubmed-5304609 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2013 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-53046092017-03-21 Multiple Exciton Generation in Colloidal Nanocrystals Smith, Charles Binks, David Nanomaterials (Basel) Review In a conventional solar cell, the energy of an absorbed photon in excess of the band gap is rapidly lost as heat, and this is one of the main reasons that the theoretical efficiency is limited to ~33%. However, an alternative process, multiple exciton generation (MEG), can occur in colloidal quantum dots. Here, some or all of the excess energy is instead used to promote one or more additional electrons to the conduction band, potentially increasing the photocurrent of a solar cell and thereby its output efficiency. This review will describe the development of this field over the decade since the first experimental demonstration of multiple exciton generation, including the controversies over experimental artefacts, comparison with similar effects in bulk materials, and the underlying mechanisms. We will also describe the current state-of-the-art and outline promising directions for further development. MDPI 2013-12-24 /pmc/articles/PMC5304609/ /pubmed/28348283 http://dx.doi.org/10.3390/nano4010019 Text en © 2013 by the authors; licensee MDPI, Basel, Switzerland. http://creativecommons.org/licenses/by/3.0/ This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/). |
spellingShingle | Review Smith, Charles Binks, David Multiple Exciton Generation in Colloidal Nanocrystals |
title | Multiple Exciton Generation in Colloidal Nanocrystals |
title_full | Multiple Exciton Generation in Colloidal Nanocrystals |
title_fullStr | Multiple Exciton Generation in Colloidal Nanocrystals |
title_full_unstemmed | Multiple Exciton Generation in Colloidal Nanocrystals |
title_short | Multiple Exciton Generation in Colloidal Nanocrystals |
title_sort | multiple exciton generation in colloidal nanocrystals |
topic | Review |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5304609/ https://www.ncbi.nlm.nih.gov/pubmed/28348283 http://dx.doi.org/10.3390/nano4010019 |
work_keys_str_mv | AT smithcharles multipleexcitongenerationincolloidalnanocrystals AT binksdavid multipleexcitongenerationincolloidalnanocrystals |