Charge Transport and Gradient Doping in Nanostructured Polypyrrole Films for Applications in Photocurrent Generation

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorBrazilian Center for Research in Energy and Materials (CNPEM)-
Autor(es): dc.contributorUniversidade Estadual Paulista (Unesp)-
Autor(es): dc.contributorFederal University of Maranhaõ (UFMA)-
Autor(es): dc.creatorPozzoli, Guilherme L. [UNESP]-
Autor(es): dc.creatorMerces, Leandro-
Autor(es): dc.creatorYassitepe, Emre-
Autor(es): dc.creatorDe Morais, Vitória B.-
Autor(es): dc.creatorDe Camargo, Davi H. S. [UNESP]-
Autor(es): dc.creatorBufon, Carlos C. Bof [UNESP]-
Data de aceite: dc.date.accessioned2022-02-22T00:25:11Z-
Data de disponibilização: dc.date.available2022-02-22T00:25:11Z-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2019-12-31-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1021/acsanm.0c00523-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/198661-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/198661-
Descrição: dc.descriptionThe investigation of the charge-transport mechanism across disordered conducting and semiconducting materials is of relevance, considering the applications in modern organic and hybrid electronics. The transition from bulk to nm-thick layers may lead to unexpected physical/chemical properties as the device interfaces do influence the overall charge-carrier conduction. Here, we present an investigation of the electrical transport across vertical heterojunctions having disordered nm-thick films (polypyrrole, PPy) as the active material. The PPy structures are prepared by chemical polymerization from the pyrrole vapor phase, resulting in film thicknesses of a few tens of nanometers. The electrical characteristics of the devices are evaluated as a function of voltage and temperature, and the charge transport is found to be strongly influenced by the presence of trap states at the PPy highest occupied molecular orbital-giving rise to space-charge-limited conduction with exponential distribution of traps. The trapping-state density is calculated, and X-ray photoelectron spectroscopy revealed an increase of disorder and a reduced doping density at the PPy growth interface. As a proof of concept, the PPy films integrated within the as-fabricated vertical heterostructures are applied as photosensitive devices. The observation of photocurrent is correlated to the presence of a gradient in the doping profile (from ca. 27.6 to 17.2% when thickness decreases from 120 to 20 nm). Our findings contribute to the elucidation of the charge-trapping center's origin in the nm-thick PPy films, as well as envision further applications in photoelectrochemistry, solar cells, and water splitting.-
Descrição: dc.descriptionBrazilian Nanotechnology National Laboratory (LNNano) Brazilian Center for Research in Energy and Materials (CNPEM)-
Descrição: dc.descriptionPostgraduate Program in Materials Science and Technology (POSMAT) Saõ Paulo State University (UNESP)-
Descrição: dc.descriptionDepartment of Physics (CCET) Federal University of Maranhaõ (UFMA)-
Descrição: dc.descriptionPostgraduate Program in Materials Science and Technology (POSMAT) Saõ Paulo State University (UNESP)-
Idioma: dc.languageen-
Relação: dc.relationACS Applied Nano Materials-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectgradient doping-
Palavras-chave: dc.subjectheterojunction-
Palavras-chave: dc.subjectnanoelectronics-
Palavras-chave: dc.subjectnanomembrane-
Palavras-chave: dc.subjectphotocurrent-
Palavras-chave: dc.subjectpolymer-
Título: dc.titleCharge Transport and Gradient Doping in Nanostructured Polypyrrole Films for Applications in Photocurrent Generation-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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