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Multiple-exciton generation in lead selenide nanorod solar cells with external quantum efficiencies exceeding 120%
Multiple-exciton generation—a process in which multiple charge-carrier pairs are generated from a single optical excitation—is a promising way to improve the photocurrent in photovoltaic devices and offers the potential to break the Shockley–Queisser limit. One-dimensional nanostructures, for exampl...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Pub. Group
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4667436/ https://www.ncbi.nlm.nih.gov/pubmed/26411283 http://dx.doi.org/10.1038/ncomms9259 |
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author | Davis, Nathaniel J. L. K. Böhm, Marcus L. Tabachnyk, Maxim Wisnivesky-Rocca-Rivarola, Florencia Jellicoe, Tom C. Ducati, Caterina Ehrler, Bruno Greenham, Neil C. |
author_facet | Davis, Nathaniel J. L. K. Böhm, Marcus L. Tabachnyk, Maxim Wisnivesky-Rocca-Rivarola, Florencia Jellicoe, Tom C. Ducati, Caterina Ehrler, Bruno Greenham, Neil C. |
author_sort | Davis, Nathaniel J. L. K. |
collection | PubMed |
description | Multiple-exciton generation—a process in which multiple charge-carrier pairs are generated from a single optical excitation—is a promising way to improve the photocurrent in photovoltaic devices and offers the potential to break the Shockley–Queisser limit. One-dimensional nanostructures, for example nanorods, have been shown spectroscopically to display increased multiple exciton generation efficiencies compared with their zero-dimensional analogues. Here we present solar cells fabricated from PbSe nanorods of three different bandgaps. All three devices showed external quantum efficiencies exceeding 100% and we report a maximum external quantum efficiency of 122% for cells consisting of the smallest bandgap nanorods. We estimate internal quantum efficiencies to exceed 150% at relatively low energies compared with other multiple exciton generation systems, and this demonstrates the potential for substantial improvements in device performance due to multiple exciton generation. |
format | Online Article Text |
id | pubmed-4667436 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | Nature Pub. Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-46674362015-12-10 Multiple-exciton generation in lead selenide nanorod solar cells with external quantum efficiencies exceeding 120% Davis, Nathaniel J. L. K. Böhm, Marcus L. Tabachnyk, Maxim Wisnivesky-Rocca-Rivarola, Florencia Jellicoe, Tom C. Ducati, Caterina Ehrler, Bruno Greenham, Neil C. Nat Commun Article Multiple-exciton generation—a process in which multiple charge-carrier pairs are generated from a single optical excitation—is a promising way to improve the photocurrent in photovoltaic devices and offers the potential to break the Shockley–Queisser limit. One-dimensional nanostructures, for example nanorods, have been shown spectroscopically to display increased multiple exciton generation efficiencies compared with their zero-dimensional analogues. Here we present solar cells fabricated from PbSe nanorods of three different bandgaps. All three devices showed external quantum efficiencies exceeding 100% and we report a maximum external quantum efficiency of 122% for cells consisting of the smallest bandgap nanorods. We estimate internal quantum efficiencies to exceed 150% at relatively low energies compared with other multiple exciton generation systems, and this demonstrates the potential for substantial improvements in device performance due to multiple exciton generation. Nature Pub. Group 2015-09-28 /pmc/articles/PMC4667436/ /pubmed/26411283 http://dx.doi.org/10.1038/ncomms9259 Text en Copyright © 2015, Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved. http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
spellingShingle | Article Davis, Nathaniel J. L. K. Böhm, Marcus L. Tabachnyk, Maxim Wisnivesky-Rocca-Rivarola, Florencia Jellicoe, Tom C. Ducati, Caterina Ehrler, Bruno Greenham, Neil C. Multiple-exciton generation in lead selenide nanorod solar cells with external quantum efficiencies exceeding 120% |
title | Multiple-exciton generation in lead selenide nanorod solar cells with external quantum efficiencies exceeding 120% |
title_full | Multiple-exciton generation in lead selenide nanorod solar cells with external quantum efficiencies exceeding 120% |
title_fullStr | Multiple-exciton generation in lead selenide nanorod solar cells with external quantum efficiencies exceeding 120% |
title_full_unstemmed | Multiple-exciton generation in lead selenide nanorod solar cells with external quantum efficiencies exceeding 120% |
title_short | Multiple-exciton generation in lead selenide nanorod solar cells with external quantum efficiencies exceeding 120% |
title_sort | multiple-exciton generation in lead selenide nanorod solar cells with external quantum efficiencies exceeding 120% |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4667436/ https://www.ncbi.nlm.nih.gov/pubmed/26411283 http://dx.doi.org/10.1038/ncomms9259 |
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