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Metadados | Descrição | Idioma |
---|---|---|
Autor(es): dc.contributor | Brazilian Center for Research in Energy and Materials (CNPEM) | - |
Autor(es): dc.contributor | Universidade Estadual Paulista (Unesp) | - |
Autor(es): dc.contributor | Federal University of Maranhaõ (UFMA) | - |
Autor(es): dc.creator | Pozzoli, Guilherme L. [UNESP] | - |
Autor(es): dc.creator | Merces, Leandro | - |
Autor(es): dc.creator | Yassitepe, Emre | - |
Autor(es): dc.creator | De Morais, Vitória B. | - |
Autor(es): dc.creator | De Camargo, Davi H. S. [UNESP] | - |
Autor(es): dc.creator | Bufon, Carlos C. Bof [UNESP] | - |
Data de aceite: dc.date.accessioned | 2022-02-22T00:25:11Z | - |
Data de disponibilização: dc.date.available | 2022-02-22T00:25:11Z | - |
Data de envio: dc.date.issued | 2020-12-11 | - |
Data de envio: dc.date.issued | 2020-12-11 | - |
Data de envio: dc.date.issued | 2019-12-31 | - |
Fonte completa do material: dc.identifier | http://dx.doi.org/10.1021/acsanm.0c00523 | - |
Fonte completa do material: dc.identifier | http://hdl.handle.net/11449/198661 | - |
Fonte: dc.identifier.uri | http://educapes.capes.gov.br/handle/11449/198661 | - |
Descrição: dc.description | The 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.description | Brazilian Nanotechnology National Laboratory (LNNano) Brazilian Center for Research in Energy and Materials (CNPEM) | - |
Descrição: dc.description | Postgraduate Program in Materials Science and Technology (POSMAT) Saõ Paulo State University (UNESP) | - |
Descrição: dc.description | Department of Physics (CCET) Federal University of Maranhaõ (UFMA) | - |
Descrição: dc.description | Postgraduate Program in Materials Science and Technology (POSMAT) Saõ Paulo State University (UNESP) | - |
Idioma: dc.language | en | - |
Relação: dc.relation | ACS Applied Nano Materials | - |
???dc.source???: dc.source | Scopus | - |
Palavras-chave: dc.subject | gradient doping | - |
Palavras-chave: dc.subject | heterojunction | - |
Palavras-chave: dc.subject | nanoelectronics | - |
Palavras-chave: dc.subject | nanomembrane | - |
Palavras-chave: dc.subject | photocurrent | - |
Palavras-chave: dc.subject | polymer | - |
Título: dc.title | Charge Transport and Gradient Doping in Nanostructured Polypyrrole Films for Applications in Photocurrent Generation | - |
Tipo de arquivo: dc.type | livro digital | - |
Aparece nas coleções: | Repositório Institucional - Unesp |
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