Improving the Back Surface Field on an Amorphous Silicon Carbide Thin‐Film Photocathode for Solar Water Splitting
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Título
Improving the Back Surface Field on an Amorphous Silicon Carbide Thin‐Film Photocathode for Solar Water SplittingAutoría
Fecha de publicación
2018-06-11Editor
Wiley-VCH VerlagISSN
1864-5631; 1864-564XCita bibliográfica
PEREZ‐RODRIGUEZ, Paula, et al. Improving the Back Surface Field on an Amorphous Silicon Carbide Thin‐Film Photocathode for Solar Water Splitting. ChemSusChem, 2018, vol. 11, no 11, p. 1797-1804Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
https://onlinelibrary.wiley.com/doi/full/10.1002/cssc.201800782Versión
info:eu-repo/semantics/acceptedVersionPalabras clave / Materias
Resumen
Amorphous silicon carbide (a‐SiC:H) is a promising material for photoelectrochemical water splitting owing to its relatively small band‐gap energy and high chemical and optoelectrical stability. This work studies the ... [+]
Amorphous silicon carbide (a‐SiC:H) is a promising material for photoelectrochemical water splitting owing to its relatively small band‐gap energy and high chemical and optoelectrical stability. This work studies the interplay between charge‐carrier separation and collection, and their injection into the electrolyte, when modifying the semiconductor/electrolyte interface. By introducing an n‐doped nanocrystaline silicon oxide layer into a p‐doped/intrinsic a‐SiC:H photocathode, the photovoltage and photocurrent of the device can be significantly improved, reaching values higher than 0.8 V. This results from enhancing the internal electric field of the photocathode, reducing the Shockley–Read–Hall recombination at the crucial interfaces because of better charge‐carrier separation. In addition, the charge‐carrier injection into the electrolyte is enhanced by introducing a TiO2 protective layer owing to better band alignment at the interface. Finally, the photocurrent was further enhanced by tuning the absorber layer thickness, arriving at a thickness of 150 nm, after which the current saturates to 10 mA cm−2 at 0 V vs. the reversible hydrogen electrode in a 0.2 m aqueous potassium hydrogen phthalate (KPH) electrolyte at pH 4. [-]
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ChemSusChem, 2018, vol. 11, no 11Proyecto de investigación
Foundation for Fundamental Research on Matter, Netherlands Organisation for Scientific Research (NWO): FOM-13CO19Derechos de acceso
Copyright © John Wiley & Sons, Inc.
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