INFLUÊNCIA DO Nb2O5 EM CÉLULAS SOLARES FOTOVOLTAICAS A BASE DE ZnO
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Biblioteca Digital de Teses e Dissertações do UNICENTRO |
Texto Completo: | http://tede.unicentro.br:8080/jspui/handle/jspui/1097 |
Resumo: | Investment in renewable energy sources has increased in recent decades due to the high environmental impact generated by the use of non-renewable sources. In this context, the conversion of solar energy into electric energy is quite promising. Dye sensitized solar cells (DSSCs) show as a promising alternative, since they are simple, non-toxic and have relatively high efficiency, but still present losses in the energy conversion process due to the effects of electronic recombination at the cell interfaces. Zinc oxide (ZnO) has been used as an electron acceptor in this type of cell because it offers good electron transport properties. In order to reduce the effects of charge recombination, niobium oxide (Nb2O5) was used, which can provide an energy barrier due to its higher energy gap when compared to other semiconductors. The zinc oxide used was commercially available and the niobium oxide was prepared by the Pechini methodology. The oxides were characterized by X-ray diffraction (XRD) technique and scanning electron microscopy (SEM). A mixture of the oxides in the proportions of 1, 5, 10 and 15% m/m of niobium oxide in zinc oxide was prepared. The mixtures were analyzed by XRD techniques, where it was observed that zinc oxide retained its structure after addition of Nb2O5 and the addition of niobium oxide was confirmed by the technique of X-ray Fluorescence Spectroscopy. The films obtained were evaluated by open circuit voltage (Voc) and photocronoamperometry where the cells were light sensitive, the efficiency was calculated, and the cell containing 1% and 5% of niobium presented the best Efficiencies ɳ = 1.35% and 1.42%, respectively. In the electrochemical impedance spectroscopy (EIS) technique the time constants for Nb2O5 containing cells were shifted to lower frequencies indicating that the recombination reactions are slower. The results of curves of Photocurrent Spectroscopy with Modulated Intensity and Photovoltage Spectroscopy with Modulated Intensity showed that the efficiency of electronic collection was higher for the cell with 5% of niobium. |
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Rodrigues, Paulo Rogério Pintohttp://lattes.cnpq.br/1559766893291724Banczek, Everson do Pradohttp://lattes.cnpq.br/752357313959216609433823940http://lattes.cnpq.br/4011449112607242Valerio, Tatiana Lima2019-05-23T13:54:56Z2018-12-20VALERIO, Tatiana Lima. INFLUÊNCIA DO Nb2O5 EM CÉLULAS SOLARES FOTOVOLTAICAS A BASE DE ZnO. 2018. 57 f. Dissertação (Programa de Pós-Graduação em Bioenergia - Mestrado) - Universidade Estadual do Centro-Oeste, Guarapuava - PR.http://tede.unicentro.br:8080/jspui/handle/jspui/1097Investment in renewable energy sources has increased in recent decades due to the high environmental impact generated by the use of non-renewable sources. In this context, the conversion of solar energy into electric energy is quite promising. Dye sensitized solar cells (DSSCs) show as a promising alternative, since they are simple, non-toxic and have relatively high efficiency, but still present losses in the energy conversion process due to the effects of electronic recombination at the cell interfaces. Zinc oxide (ZnO) has been used as an electron acceptor in this type of cell because it offers good electron transport properties. In order to reduce the effects of charge recombination, niobium oxide (Nb2O5) was used, which can provide an energy barrier due to its higher energy gap when compared to other semiconductors. The zinc oxide used was commercially available and the niobium oxide was prepared by the Pechini methodology. The oxides were characterized by X-ray diffraction (XRD) technique and scanning electron microscopy (SEM). A mixture of the oxides in the proportions of 1, 5, 10 and 15% m/m of niobium oxide in zinc oxide was prepared. The mixtures were analyzed by XRD techniques, where it was observed that zinc oxide retained its structure after addition of Nb2O5 and the addition of niobium oxide was confirmed by the technique of X-ray Fluorescence Spectroscopy. The films obtained were evaluated by open circuit voltage (Voc) and photocronoamperometry where the cells were light sensitive, the efficiency was calculated, and the cell containing 1% and 5% of niobium presented the best Efficiencies ɳ = 1.35% and 1.42%, respectively. In the electrochemical impedance spectroscopy (EIS) technique the time constants for Nb2O5 containing cells were shifted to lower frequencies indicating that the recombination reactions are slower. The results of curves of Photocurrent Spectroscopy with Modulated Intensity and Photovoltage Spectroscopy with Modulated Intensity showed that the efficiency of electronic collection was higher for the cell with 5% of niobium.O investimento em fontes renováveis de energia tem aumentado nas últimas décadas, devido ao alto impacto ambiental gerado por utilização de fontes não renováveis. Neste contexto, a conversão de energia solar em energia elétrica é bastante promissora. As células solares sensibilizadas por corantes (DSSCs) surgem como uma alternativa promissora, pois estas são simples, não tóxicas e apresentam eficiência relativamente alta, porém ainda apresenta perdas no processo de conversão energética, devido aos efeitos de recombinação eletrônica nas interfaces da célula. O óxido de zinco (ZnO), tem sido empregado como aceitador de elétrons neste tipo de célula, pois oferece boas propriedades de transporte de elétrons. Com intuito de diminuir os efeitos de recombinação de carga, utilizou-se o óxido de nióbio (Nb2O5) que pode fornecer uma barreira energética devido ao seu gap de energia ser maior quando comparado a outros semicondutores. O óxido de zinco utilizado foi de fonte comercial e o óxido de nióbio foi preparado a partir da metodologia de Pechini. Os óxidos foram caracterizados pelas técnicas de difração de raios X (DRX) e microscopia eletrônica de varredura (MEV). Foi preparada uma mistura dos óxidos nas proporções de 1%, 5%, 10% e 15% m/m de óxido de nióbio em óxido de zinco. As misturas foram analisadas pelas técnicas de DRX, onde observou-se que o óxido de zinco manteve sua estrutura após adição do Nb2O5 e comprovou- se a adição de óxido de nióbio através da técnica de e Espectroscopia de Fluorescência de raios X. Os filmes obtidos foram avaliados por potencial de circuito aberto (open circuit voltage, Voc) e fotocronoamperometria onde observou-se que as células são sensíveis a luz, a eficiência foi calculada, e a célula contendo 1% e 5% de nióbio apresentaram as melhores eficiências ɳ = 1,35% e 1,42%, respectivamente. Na técnica de espectroscopia de impedância eletroquímica (EIE) as constantes de tempos para as células contendo Nb2O5 foram deslocadas para frequências mais baixas indicando que as reações de recombinação são mais lentas. Os resultados de curvas de Espectroscopia de Fotocorrente com Intensidade Modulada e Espectroscopia de Fotovoltagem com Intensidade Modulada mostraram que a eficiência de coleta eletrônica foi maior para a célula com 5% de nióbio.Submitted by Fabiano Jucá (fjuca@unicentro.br) on 2019-05-23T13:54:56Z No. of bitstreams: 1 Dissertação Tatiana Lima Valerio.pdf: 1562633 bytes, checksum: d0c2c0483188dd42be163e0f6566d482 (MD5)Made available in DSpace on 2019-05-23T13:54:56Z (GMT). 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dc.title.por.fl_str_mv |
INFLUÊNCIA DO Nb2O5 EM CÉLULAS SOLARES FOTOVOLTAICAS A BASE DE ZnO |
title |
INFLUÊNCIA DO Nb2O5 EM CÉLULAS SOLARES FOTOVOLTAICAS A BASE DE ZnO |
spellingShingle |
INFLUÊNCIA DO Nb2O5 EM CÉLULAS SOLARES FOTOVOLTAICAS A BASE DE ZnO Valerio, Tatiana Lima Recombinação de carga energias renováveis bioenergia sustentabilidade Charge recombination renewable energies bioenergy sustainability CIENCIAS EXATAS E DA TERRA::QUIMICA ENGENHARIAS CIENCIAS BIOLOGICAS CIENCIAS SOCIAIS APLICADAS::ADMINISTRACAO |
title_short |
INFLUÊNCIA DO Nb2O5 EM CÉLULAS SOLARES FOTOVOLTAICAS A BASE DE ZnO |
title_full |
INFLUÊNCIA DO Nb2O5 EM CÉLULAS SOLARES FOTOVOLTAICAS A BASE DE ZnO |
title_fullStr |
INFLUÊNCIA DO Nb2O5 EM CÉLULAS SOLARES FOTOVOLTAICAS A BASE DE ZnO |
title_full_unstemmed |
INFLUÊNCIA DO Nb2O5 EM CÉLULAS SOLARES FOTOVOLTAICAS A BASE DE ZnO |
title_sort |
INFLUÊNCIA DO Nb2O5 EM CÉLULAS SOLARES FOTOVOLTAICAS A BASE DE ZnO |
author |
Valerio, Tatiana Lima |
author_facet |
Valerio, Tatiana Lima |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Rodrigues, Paulo Rogério Pinto |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/1559766893291724 |
dc.contributor.advisor-co1.fl_str_mv |
Banczek, Everson do Prado |
dc.contributor.advisor-co1Lattes.fl_str_mv |
http://lattes.cnpq.br/7523573139592166 |
dc.contributor.authorID.fl_str_mv |
09433823940 |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/4011449112607242 |
dc.contributor.author.fl_str_mv |
Valerio, Tatiana Lima |
contributor_str_mv |
Rodrigues, Paulo Rogério Pinto Banczek, Everson do Prado |
dc.subject.por.fl_str_mv |
Recombinação de carga energias renováveis bioenergia sustentabilidade |
topic |
Recombinação de carga energias renováveis bioenergia sustentabilidade Charge recombination renewable energies bioenergy sustainability CIENCIAS EXATAS E DA TERRA::QUIMICA ENGENHARIAS CIENCIAS BIOLOGICAS CIENCIAS SOCIAIS APLICADAS::ADMINISTRACAO |
dc.subject.eng.fl_str_mv |
Charge recombination renewable energies bioenergy sustainability |
dc.subject.cnpq.fl_str_mv |
CIENCIAS EXATAS E DA TERRA::QUIMICA ENGENHARIAS CIENCIAS BIOLOGICAS CIENCIAS SOCIAIS APLICADAS::ADMINISTRACAO |
description |
Investment in renewable energy sources has increased in recent decades due to the high environmental impact generated by the use of non-renewable sources. In this context, the conversion of solar energy into electric energy is quite promising. Dye sensitized solar cells (DSSCs) show as a promising alternative, since they are simple, non-toxic and have relatively high efficiency, but still present losses in the energy conversion process due to the effects of electronic recombination at the cell interfaces. Zinc oxide (ZnO) has been used as an electron acceptor in this type of cell because it offers good electron transport properties. In order to reduce the effects of charge recombination, niobium oxide (Nb2O5) was used, which can provide an energy barrier due to its higher energy gap when compared to other semiconductors. The zinc oxide used was commercially available and the niobium oxide was prepared by the Pechini methodology. The oxides were characterized by X-ray diffraction (XRD) technique and scanning electron microscopy (SEM). A mixture of the oxides in the proportions of 1, 5, 10 and 15% m/m of niobium oxide in zinc oxide was prepared. The mixtures were analyzed by XRD techniques, where it was observed that zinc oxide retained its structure after addition of Nb2O5 and the addition of niobium oxide was confirmed by the technique of X-ray Fluorescence Spectroscopy. The films obtained were evaluated by open circuit voltage (Voc) and photocronoamperometry where the cells were light sensitive, the efficiency was calculated, and the cell containing 1% and 5% of niobium presented the best Efficiencies ɳ = 1.35% and 1.42%, respectively. In the electrochemical impedance spectroscopy (EIS) technique the time constants for Nb2O5 containing cells were shifted to lower frequencies indicating that the recombination reactions are slower. The results of curves of Photocurrent Spectroscopy with Modulated Intensity and Photovoltage Spectroscopy with Modulated Intensity showed that the efficiency of electronic collection was higher for the cell with 5% of niobium. |
publishDate |
2018 |
dc.date.issued.fl_str_mv |
2018-12-20 |
dc.date.accessioned.fl_str_mv |
2019-05-23T13:54:56Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
VALERIO, Tatiana Lima. INFLUÊNCIA DO Nb2O5 EM CÉLULAS SOLARES FOTOVOLTAICAS A BASE DE ZnO. 2018. 57 f. Dissertação (Programa de Pós-Graduação em Bioenergia - Mestrado) - Universidade Estadual do Centro-Oeste, Guarapuava - PR. |
dc.identifier.uri.fl_str_mv |
http://tede.unicentro.br:8080/jspui/handle/jspui/1097 |
identifier_str_mv |
VALERIO, Tatiana Lima. INFLUÊNCIA DO Nb2O5 EM CÉLULAS SOLARES FOTOVOLTAICAS A BASE DE ZnO. 2018. 57 f. Dissertação (Programa de Pós-Graduação em Bioenergia - Mestrado) - Universidade Estadual do Centro-Oeste, Guarapuava - PR. |
url |
http://tede.unicentro.br:8080/jspui/handle/jspui/1097 |
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por |
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UNICENTRO |
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Unicentro::Departamento de Ciências Agrárias e Ambientais |
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Universidade Estadual do Centro-Oeste |
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