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Analytical model for the photocurrent-voltage characteristics of bilayer MEH-PPV/TiO(2 )photovoltaic devices
The photocurrent in bilayer polymer photovoltaic cells is dominated by the exciton dissociation efficiency at donor/acceptor interface. An analytical model is developed for the photocurrent-voltage characteristics of the bilayer polymer/TiO(2 )photovoltaic cells. The model gives an analytical expres...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Springer
2011
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3211440/ https://www.ncbi.nlm.nih.gov/pubmed/21711905 http://dx.doi.org/10.1186/1556-276X-6-350 |
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author | Chen, Chong Wu, Fan Geng, Hongwei Shen, Wei Wang, Mingtai |
author_facet | Chen, Chong Wu, Fan Geng, Hongwei Shen, Wei Wang, Mingtai |
author_sort | Chen, Chong |
collection | PubMed |
description | The photocurrent in bilayer polymer photovoltaic cells is dominated by the exciton dissociation efficiency at donor/acceptor interface. An analytical model is developed for the photocurrent-voltage characteristics of the bilayer polymer/TiO(2 )photovoltaic cells. The model gives an analytical expression for the exciton dissociation efficiency at the interface, and explains the dependence of the photocurrent of the devices on the internal electric field, the polymer and TiO(2 )layer thicknesses. Bilayer polymer/TiO(2 )cells consisting of poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) and TiO(2), with different thicknesses of the polymer and TiO(2 )films, were prepared for experimental purposes. The experimental results for the prepared bilayer MEH-PPV/TiO(2 )cells under different conditions are satisfactorily fitted to the model. Results show that increasing TiO(2 )or the polymer layer in thickness will reduce the exciton dissociation efficiency in the device and further the photocurrent. It is found that the photocurrent is determined by the competition between the exciton dissociation and charge recombination at the donor/acceptor interface, and the increase in photocurrent under a higher incident light intensity is due to the increased exciton density rather than the increase in the exciton dissociation efficiency. |
format | Online Article Text |
id | pubmed-3211440 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2011 |
publisher | Springer |
record_format | MEDLINE/PubMed |
spelling | pubmed-32114402011-11-09 Analytical model for the photocurrent-voltage characteristics of bilayer MEH-PPV/TiO(2 )photovoltaic devices Chen, Chong Wu, Fan Geng, Hongwei Shen, Wei Wang, Mingtai Nanoscale Res Lett Nano Express The photocurrent in bilayer polymer photovoltaic cells is dominated by the exciton dissociation efficiency at donor/acceptor interface. An analytical model is developed for the photocurrent-voltage characteristics of the bilayer polymer/TiO(2 )photovoltaic cells. The model gives an analytical expression for the exciton dissociation efficiency at the interface, and explains the dependence of the photocurrent of the devices on the internal electric field, the polymer and TiO(2 )layer thicknesses. Bilayer polymer/TiO(2 )cells consisting of poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) and TiO(2), with different thicknesses of the polymer and TiO(2 )films, were prepared for experimental purposes. The experimental results for the prepared bilayer MEH-PPV/TiO(2 )cells under different conditions are satisfactorily fitted to the model. Results show that increasing TiO(2 )or the polymer layer in thickness will reduce the exciton dissociation efficiency in the device and further the photocurrent. It is found that the photocurrent is determined by the competition between the exciton dissociation and charge recombination at the donor/acceptor interface, and the increase in photocurrent under a higher incident light intensity is due to the increased exciton density rather than the increase in the exciton dissociation efficiency. Springer 2011-04-19 /pmc/articles/PMC3211440/ /pubmed/21711905 http://dx.doi.org/10.1186/1556-276X-6-350 Text en Copyright ©2011 Chen et al; licensee Springer. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Nano Express Chen, Chong Wu, Fan Geng, Hongwei Shen, Wei Wang, Mingtai Analytical model for the photocurrent-voltage characteristics of bilayer MEH-PPV/TiO(2 )photovoltaic devices |
title | Analytical model for the photocurrent-voltage characteristics of bilayer MEH-PPV/TiO(2 )photovoltaic devices |
title_full | Analytical model for the photocurrent-voltage characteristics of bilayer MEH-PPV/TiO(2 )photovoltaic devices |
title_fullStr | Analytical model for the photocurrent-voltage characteristics of bilayer MEH-PPV/TiO(2 )photovoltaic devices |
title_full_unstemmed | Analytical model for the photocurrent-voltage characteristics of bilayer MEH-PPV/TiO(2 )photovoltaic devices |
title_short | Analytical model for the photocurrent-voltage characteristics of bilayer MEH-PPV/TiO(2 )photovoltaic devices |
title_sort | analytical model for the photocurrent-voltage characteristics of bilayer meh-ppv/tio(2 )photovoltaic devices |
topic | Nano Express |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3211440/ https://www.ncbi.nlm.nih.gov/pubmed/21711905 http://dx.doi.org/10.1186/1556-276X-6-350 |
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