Effect of plasma power on the semiconducting behavior of low-frequency PECVD TiO2 and nitrogen-doped TiO2 anodic thin coatings: photo-electrochemical studies in a single compartment cell for hydrogen generation by solar water splitting

Abstract : Previously optimized anatase and nitrogen-doped anatase TiO2 coatings have been grown by low-frequency plasma-enhanced chemical vapor deposition (PECVD) on different kinds of substrates at low plasma power (64W) and high plasma power (100W) for photo-electrochemical studies. Nitrogen-doped TiO2 layers exhibit better photoactivity and also higher electronic conductivity under UV and visible irradiations than non-doped materials. The main reason is that nitrogen introduction induces TiO2 band gap tailoring towards higher wavelengths. In addition, films prepared at low plasma power present a typical photo-material' behavior (whose activity depends directly on the presence of light) while layers synthesized at higher plasma power contain an initial conductive phase giving them an activity that exists in the dark yet and can be slightly enhanced by illumination. Such conclusions are prominent in the field of photo-anodic thin films; indeed PECVD could constitute a promising approach for tailoring the efficiency of photo-electrochemical cells for hydrogen production under solar light.
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https://hal.umontpellier.fr/hal-02022812
Contributeur : Philippe Falque <>
Soumis le : lundi 18 février 2019 - 11:28:58
Dernière modification le : mercredi 21 août 2019 - 18:14:03

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  • HAL Id : hal-02022812, version 1

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Loraine Youssef, Stephanie Roualdes, Joelle Bassil, Mirvat Zakhour, Vincent Rouessac, et al.. Effect of plasma power on the semiconducting behavior of low-frequency PECVD TiO2 and nitrogen-doped TiO2 anodic thin coatings: photo-electrochemical studies in a single compartment cell for hydrogen generation by solar water splitting. Journal of Applied Electrochemistry, Springer Verlag, 2019, 49 (2), pp.135-150. ⟨hal-02022812⟩

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