Memorias de investigación
Artículos en revistas:
Highly responsive UV-photodetectors based on single electrospun TiO2 nanofibres
Año:2016
Áreas de investigación
  • Células solares,
  • Otros dispositivos fotónicos receptores de luz
Datos
Descripción
In this work we study the optoelectronic properties of individual TiO2 fibres produced through coupled sol-gel and electrospinning, by depositing them onto pre-patterned Ti/Au electrodes on SiO2/Si substrates. Transport measurements in the dark give a conductivity above 2 [times] 10-5 S, which increases up to 8 [times] 10-5 S in vacuum. Photocurrent measurements under UV-irradiation show high sensitivity (responsivity of 90 A W-1 for 375 nm wavelength) and a response time to illumination of [similar]5 s, which is superior to state-of-the-art TiO2-based UV photodetectors. Both responsivity and response speed are higher in air than in vacuum, due to oxygen adsorbed on the TiO2 surface which traps photoexcited free electrons in the conduction band, thus reducing the recombination processes. The photodetectors are sensitive to light polarization, with an anisotropy ratio of 12%. These results highlight the interesting combination of large surface area and low 1D transport resistance in electrospun TiO2 fibres. The simplicity of the sol-gel/electrospinning synthesis method, combined with a fast response and high responsivity makes them attractive candidates for UV-photodetection in ambient conditions. We anticipate their high (photo) conductance is also relevant for photocatalysis and dye-sensitized solar cells.
Internacional
Si
JCR del ISI
Si
Título de la revista
Journal of Materials Chemistry C
ISSN
2050-7526
Factor de impacto JCR
0
Información de impacto
Volumen
4
DOI
10.1039/c6tc02344d
Número de revista
45
Desde la página
10707
Hasta la página
10714
Mes
SIN MES
Ranking
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Participantes
  • Autor: A.J. Molina-Mendoza
  • Autor: A. Moya
  • Autor: R. Frisenda
  • Autor: S.A. Svatek
  • Autor: P. Gant
  • Autor: S. González-Abad
  • Autor: Elisa Antolin Fernandez UPM
  • Autor: N. Agrait
  • Autor: G. Rubio-Bollinger
  • Autor: D. Pérez de Lara
  • Autor: J.J. Vilatela
  • Autor: A. Castellanos-Gómez
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Silicio y Nuevos Conceptos para Células Solares