Síntese eletroquímica e caracterização de filmes finos de Sb2Se3
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFSCAR |
Texto Completo: | https://repositorio.ufscar.br/handle/ufscar/9885 |
Resumo: | Due to the environmental appeal, the shortage of raw material and the chemical complexity of some systems employed at photovoltaic devices, interest has been growing for semiconductors composed of abundant, low toxicity and less costly elements. Among these, the Sb2Se3 has gained attention, because besides having all the mentioned characteristics, it presents good photovoltaic properties. The present work presents the electro-obtaining of Sb2Se3 thin films, as well as the exploratory study of its properties from the effects of the thermal treatment (TT), the electrodeposition parameters and the addition of Fe2+ as a dopant to its photoelectrocatalytic activity in the reduction reaction of H+. The films were prepared by potentiostatic co-electrodeposition on FTO in a bath composed of K(SbO)C4H4O6 and SeO2 in 0.5 mol L-1 Na2SO4/H2SO4 – pH 2.0. After obtaining, they were submitted to different TT conditions under atmosphere of Se(vapor)/N2. Cyclic voltammetries were used to evaluate the electrochemical process of each separate element and the binary system. For the study of the electrodeposition parameters, the concentrations of the Sb and Se precursors (SbO+ and H2SeO3, respectively), the total deposition charge and the type of the supporting electrolyte were evaluated. Finally, the study of the addition of Fe2+ in the bath allowed to evaluate its effect under different concentrations of the dopant. Thus, through the morphological-structural analysis, band-gap and photoelectrocatalytic activity, it was possible to reach the optimized condition of obtaining Sb2Se3 films. Of all the proposed TT conditions, the one submitted to 300 °C for 3 h showed better results, exhibiting good optoelectronic property and photoactivity, with band gap of 1.08 eV and average photocurrent of 168.15 μA cm-2, respectively. With the study of the electrodeposition parameters allowed to reach the following optimized condition: bath with 2.5 mmol L-1 K(SbO)C4H4O6 and 2.0 mmol L-1 SeO2 in 0.5 mol L-1 Na2SO4/H2SO4 – pH 2.0, and deposition total charge of 600 mC, besides of the applied potential of -0.6 V vs. Ag/AgCl/Cl-(sat. KCl). In the doping study, the incorporation of Fe2+ caused low influence on the band gap of the films and on their morphological-structural properties. In the film obtained from the deposition bath composed of 5% Fe, it presented a similar photocurrent to the non-doped film, however, with carrier density in an order of magnitude three times higher, i.e., 1,0 x 10^19 cm-3, showing an important characteristic for a high efficiency and fill factor in the case a photovoltaic device was installed. |
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Costa, Magno BarcelosMascaro, Lucia Helenahttp://lattes.cnpq.br/9130022476352844http://lattes.cnpq.br/27258562504178862018-05-07T19:44:51Z2018-05-07T19:44:51Z2017-12-05COSTA, Magno Barcelos. Síntese eletroquímica e caracterização de filmes finos de Sb2Se3. 2017. Dissertação (Mestrado em Química) – Universidade Federal de São Carlos, São Carlos, 2017. Disponível em: https://repositorio.ufscar.br/handle/ufscar/9885.https://repositorio.ufscar.br/handle/ufscar/9885Due to the environmental appeal, the shortage of raw material and the chemical complexity of some systems employed at photovoltaic devices, interest has been growing for semiconductors composed of abundant, low toxicity and less costly elements. Among these, the Sb2Se3 has gained attention, because besides having all the mentioned characteristics, it presents good photovoltaic properties. The present work presents the electro-obtaining of Sb2Se3 thin films, as well as the exploratory study of its properties from the effects of the thermal treatment (TT), the electrodeposition parameters and the addition of Fe2+ as a dopant to its photoelectrocatalytic activity in the reduction reaction of H+. The films were prepared by potentiostatic co-electrodeposition on FTO in a bath composed of K(SbO)C4H4O6 and SeO2 in 0.5 mol L-1 Na2SO4/H2SO4 – pH 2.0. After obtaining, they were submitted to different TT conditions under atmosphere of Se(vapor)/N2. Cyclic voltammetries were used to evaluate the electrochemical process of each separate element and the binary system. For the study of the electrodeposition parameters, the concentrations of the Sb and Se precursors (SbO+ and H2SeO3, respectively), the total deposition charge and the type of the supporting electrolyte were evaluated. Finally, the study of the addition of Fe2+ in the bath allowed to evaluate its effect under different concentrations of the dopant. Thus, through the morphological-structural analysis, band-gap and photoelectrocatalytic activity, it was possible to reach the optimized condition of obtaining Sb2Se3 films. Of all the proposed TT conditions, the one submitted to 300 °C for 3 h showed better results, exhibiting good optoelectronic property and photoactivity, with band gap of 1.08 eV and average photocurrent of 168.15 μA cm-2, respectively. With the study of the electrodeposition parameters allowed to reach the following optimized condition: bath with 2.5 mmol L-1 K(SbO)C4H4O6 and 2.0 mmol L-1 SeO2 in 0.5 mol L-1 Na2SO4/H2SO4 – pH 2.0, and deposition total charge of 600 mC, besides of the applied potential of -0.6 V vs. Ag/AgCl/Cl-(sat. KCl). In the doping study, the incorporation of Fe2+ caused low influence on the band gap of the films and on their morphological-structural properties. In the film obtained from the deposition bath composed of 5% Fe, it presented a similar photocurrent to the non-doped film, however, with carrier density in an order of magnitude three times higher, i.e., 1,0 x 10^19 cm-3, showing an important characteristic for a high efficiency and fill factor in the case a photovoltaic device was installed.Devido o apelo ambiental, a escassez de matéria prima e a complexidade química de alguns sistemas empregados em dispositivos fotovoltaicos, tem crescido o interesse por semicondutores compostos de elementos abundantes, de baixa toxicidade e menos custosos. Dentre esses, o Sb2Se3 tem ganhado atenção, pois além de possuir todas as características citadas, apresenta boas propriedades fotovoltaicas. O presente trabalho apresenta a eletro-obtenção de filmes finos de Sb2Se3, bem como o estudo exploratório de suas propriedades a partir dos efeitos do tratamento térmico (TT), dos parâmetros de eletrodeposição e da adição de Fe2+ como dopante frente à sua atividade fotoeletrocatalítica na reação de redução de H+. Os filmes foram preparados por co-eletrodeposição potenciostática sobre FTO em um banho composto de K(SbO)C4H4O6 e SeO2 em Na2SO4 0,5 mol L-1/H2SO4 – pH 2,0. Após obtenção, eles foram submetidos à diferentes condições de TT sob atmosfera de Se(vapor)/N2. Voltametrias cíclicas foram usadas para avaliar o processo eletroquímico de cada elemento separado e o sistema binário. Para o estudo dos parâmetros de eletrodeposição foram avaliadas as concentrações dos precursores de Sb e Se no banho (SbO+ e H2SeO3, respectivamente), a carga total de deposição e o tipo do eletrólito de suporte. Finalmente, o estudo da adição de Fe2+ no banho permitiu avaliar seus efeitos sob diferentes concentrações do dopante. Assim, por meio da análises morfológicas-estruturais, band gap e atividade fotoeletrocatalítica foi possível alcançar a condição otimizada de obtenção dos filmes de Sb2Se3. De todas as condições de TT propostas, a submetida a 300 °C por 3 h revelou melhores resultados, exibindo boa propriedade optoeletrônica e fotoatividade, com band gap de 1,08 eV e fotocorrente média de 168,15 µA cm-2. Com o estudo dos parâmetros de eletrodeposição permitiu chegar à seguinte condição otimizada: banho com 2,5 mmol L-1 de K(SbO)C4H4O6 e 2,0 mmol L-1 de SeO2 em Na2SO4 0,5 mol L-1/H2SO4 – pH 2,0, e carga total de deposição de 600 mC, além do potencial aplicado de -0,6 V vs. Ag/AgCl/Cl-(KCl sat.). No estudo de dopagem, a incorporação de Fe2+ causou baixa influencia no band gap dos filmes e em suas propriedades morfológicas-estruturais. O filme obtido a partir do banho de deposição composto por 5% de Fe apresentou fotocorrente similar ao filme não dopado, porém, com densidade de portadores numa ordem de grandeza três vezes maior, i.e., 1,0 x 10^19 cm-3, mostrando-se uma característica importante para uma alta eficiência e fator de preenchimento caso um dispositivo fotovoltaico fosse montado.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)CNPQ: 164429/2015-8porUniversidade Federal de São CarlosCâmpus São CarlosPrograma de Pós-Graduação em Química - PPGQUFSCarSeleneto de antimônioFotoeletroquímicaTratamento térmicoDopagemEletrodeposiçãoAntimony selenideThermal treatmentDopingElectrodepositionCIENCIAS EXATAS E DA TERRA::QUIMICA::FISICO-QUIMICA::ELETROQUIMICASíntese eletroquímica e caracterização de filmes finos de Sb2Se3Electrochemical synthesis and characterization of Sb2Se3 thin filmsinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisOnlineinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARORIGINALDissertação final 2.pdfDissertação final 2.pdfapplication/pdf2928848https://{{ getenv "DSPACE_HOST" "repositorio.ufscar.br" }}/bitstream/ufscar/9885/1/Disserta%c3%a7%c3%a3o%20final%202.pdfa3c1f38bdff573c2400be4c1a825951aMD51Carta da versão final da dissertação.jpgCarta da versão final da dissertação.jpgimage/jpeg704540https://{{ getenv "DSPACE_HOST" "repositorio.ufscar.br" }}/bitstream/ufscar/9885/2/Carta%20da%20vers%c3%a3o%20final%20da%20disserta%c3%a7%c3%a3o.jpg7ecb6e0745770a925ef70683753d6a18MD52LICENSElicense.txtlicense.txttext/plain; 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dc.title.por.fl_str_mv |
Síntese eletroquímica e caracterização de filmes finos de Sb2Se3 |
dc.title.alternative.eng.fl_str_mv |
Electrochemical synthesis and characterization of Sb2Se3 thin films |
title |
Síntese eletroquímica e caracterização de filmes finos de Sb2Se3 |
spellingShingle |
Síntese eletroquímica e caracterização de filmes finos de Sb2Se3 Costa, Magno Barcelos Seleneto de antimônio Fotoeletroquímica Tratamento térmico Dopagem Eletrodeposição Antimony selenide Thermal treatment Doping Electrodeposition CIENCIAS EXATAS E DA TERRA::QUIMICA::FISICO-QUIMICA::ELETROQUIMICA |
title_short |
Síntese eletroquímica e caracterização de filmes finos de Sb2Se3 |
title_full |
Síntese eletroquímica e caracterização de filmes finos de Sb2Se3 |
title_fullStr |
Síntese eletroquímica e caracterização de filmes finos de Sb2Se3 |
title_full_unstemmed |
Síntese eletroquímica e caracterização de filmes finos de Sb2Se3 |
title_sort |
Síntese eletroquímica e caracterização de filmes finos de Sb2Se3 |
author |
Costa, Magno Barcelos |
author_facet |
Costa, Magno Barcelos |
author_role |
author |
dc.contributor.authorlattes.por.fl_str_mv |
http://lattes.cnpq.br/2725856250417886 |
dc.contributor.author.fl_str_mv |
Costa, Magno Barcelos |
dc.contributor.advisor1.fl_str_mv |
Mascaro, Lucia Helena |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/9130022476352844 |
contributor_str_mv |
Mascaro, Lucia Helena |
dc.subject.por.fl_str_mv |
Seleneto de antimônio Fotoeletroquímica Tratamento térmico Dopagem Eletrodeposição |
topic |
Seleneto de antimônio Fotoeletroquímica Tratamento térmico Dopagem Eletrodeposição Antimony selenide Thermal treatment Doping Electrodeposition CIENCIAS EXATAS E DA TERRA::QUIMICA::FISICO-QUIMICA::ELETROQUIMICA |
dc.subject.eng.fl_str_mv |
Antimony selenide Thermal treatment Doping Electrodeposition |
dc.subject.cnpq.fl_str_mv |
CIENCIAS EXATAS E DA TERRA::QUIMICA::FISICO-QUIMICA::ELETROQUIMICA |
description |
Due to the environmental appeal, the shortage of raw material and the chemical complexity of some systems employed at photovoltaic devices, interest has been growing for semiconductors composed of abundant, low toxicity and less costly elements. Among these, the Sb2Se3 has gained attention, because besides having all the mentioned characteristics, it presents good photovoltaic properties. The present work presents the electro-obtaining of Sb2Se3 thin films, as well as the exploratory study of its properties from the effects of the thermal treatment (TT), the electrodeposition parameters and the addition of Fe2+ as a dopant to its photoelectrocatalytic activity in the reduction reaction of H+. The films were prepared by potentiostatic co-electrodeposition on FTO in a bath composed of K(SbO)C4H4O6 and SeO2 in 0.5 mol L-1 Na2SO4/H2SO4 – pH 2.0. After obtaining, they were submitted to different TT conditions under atmosphere of Se(vapor)/N2. Cyclic voltammetries were used to evaluate the electrochemical process of each separate element and the binary system. For the study of the electrodeposition parameters, the concentrations of the Sb and Se precursors (SbO+ and H2SeO3, respectively), the total deposition charge and the type of the supporting electrolyte were evaluated. Finally, the study of the addition of Fe2+ in the bath allowed to evaluate its effect under different concentrations of the dopant. Thus, through the morphological-structural analysis, band-gap and photoelectrocatalytic activity, it was possible to reach the optimized condition of obtaining Sb2Se3 films. Of all the proposed TT conditions, the one submitted to 300 °C for 3 h showed better results, exhibiting good optoelectronic property and photoactivity, with band gap of 1.08 eV and average photocurrent of 168.15 μA cm-2, respectively. With the study of the electrodeposition parameters allowed to reach the following optimized condition: bath with 2.5 mmol L-1 K(SbO)C4H4O6 and 2.0 mmol L-1 SeO2 in 0.5 mol L-1 Na2SO4/H2SO4 – pH 2.0, and deposition total charge of 600 mC, besides of the applied potential of -0.6 V vs. Ag/AgCl/Cl-(sat. KCl). In the doping study, the incorporation of Fe2+ caused low influence on the band gap of the films and on their morphological-structural properties. In the film obtained from the deposition bath composed of 5% Fe, it presented a similar photocurrent to the non-doped film, however, with carrier density in an order of magnitude three times higher, i.e., 1,0 x 10^19 cm-3, showing an important characteristic for a high efficiency and fill factor in the case a photovoltaic device was installed. |
publishDate |
2017 |
dc.date.issued.fl_str_mv |
2017-12-05 |
dc.date.accessioned.fl_str_mv |
2018-05-07T19:44:51Z |
dc.date.available.fl_str_mv |
2018-05-07T19:44:51Z |
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 |
COSTA, Magno Barcelos. Síntese eletroquímica e caracterização de filmes finos de Sb2Se3. 2017. Dissertação (Mestrado em Química) – Universidade Federal de São Carlos, São Carlos, 2017. Disponível em: https://repositorio.ufscar.br/handle/ufscar/9885. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufscar.br/handle/ufscar/9885 |
identifier_str_mv |
COSTA, Magno Barcelos. Síntese eletroquímica e caracterização de filmes finos de Sb2Se3. 2017. Dissertação (Mestrado em Química) – Universidade Federal de São Carlos, São Carlos, 2017. Disponível em: https://repositorio.ufscar.br/handle/ufscar/9885. |
url |
https://repositorio.ufscar.br/handle/ufscar/9885 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Universidade Federal de São Carlos Câmpus São Carlos |
dc.publisher.program.fl_str_mv |
Programa de Pós-Graduação em Química - PPGQ |
dc.publisher.initials.fl_str_mv |
UFSCar |
publisher.none.fl_str_mv |
Universidade Federal de São Carlos Câmpus São Carlos |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UFSCAR instname:Universidade Federal de São Carlos (UFSCAR) instacron:UFSCAR |
instname_str |
Universidade Federal de São Carlos (UFSCAR) |
instacron_str |
UFSCAR |
institution |
UFSCAR |
reponame_str |
Repositório Institucional da UFSCAR |
collection |
Repositório Institucional da UFSCAR |
bitstream.url.fl_str_mv |
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bitstream.checksumAlgorithm.fl_str_mv |
MD5 MD5 MD5 MD5 MD5 MD5 |
repository.name.fl_str_mv |
Repositório Institucional da UFSCAR - Universidade Federal de São Carlos (UFSCAR) |
repository.mail.fl_str_mv |
|
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1777472093060857856 |