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Keraudy, J., Ferrec, A., Richard-Plouet, M., Hamon, J., Goullet, A. & Jouan, P.-Y. (2017) Nitrogen doping on NiO by reactive magnetron sputtering: A new pathway to dynamically tune the optical and electrical properties. Appl. Surf. Sci. 409 77–84.
Added by: Richard Baschera (2017-06-20 14:50:38) Last edited by: Richard Baschera (2017-06-20 15:27:41) |
| Type de référence: Article DOI: 10.1016/j.apsusc.2017.02.229 Numéro d'identification (ISBN etc.): 0169-4332 Clé BibTeX: Keraudy2017 Voir tous les détails bibliographiques  |
Catégories: INTERNATIONAL, PCM Mots-clés: c-afm, electronic-structure, intermediate band, n-doped tio2, nickel metal, Nickel oxide, Nitrogen doping, Optical band-gap, oxide thin-films, Reactive sputtering, solar-cells, spectroscopy, states, visible-light photocatalysis, XPS Créateurs: Ferrec, Goullet, Hamon, Jouan, Keraudy, Richard-Plouet Collection: Appl. Surf. Sci. |
Consultations : 1/578
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| Résumé |
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N-doped nickel oxide (NiO:N) thin films were deposited on glass and silicon substrates by reactive DC magnetron sputtering in Ar/O-2/N-2 gas atmosphere with a series of N-2/O-2 gas ratio ranging from 0 to 80%. X-ray diffraction measurements have revealed that the films are constituted of Ni1_xO grains and showed enhanced polycrystalline features with increasing N-doping concentration. For the first time, we report here that N-doping in the Ni-deficient NiO (Ni1-xO) film leads to a band-gap narrowing from 3.6 to 2.3 eV. X-ray photoelectron spectroscopy (XPS) measurements proved that up to 4 atomic percent (at.%) nitrogen can be incorporated at least at the surface of the NiO:N samples. In addition, XPS valence band spectra and UV-vis transmission measurements have demonstrated that the band-gap narrowing may originates from the contribution of an intermediate band (IB) similar to 2.4 eV just above the valence band maximum and the up-shifting of the valence band edge (similar to 0.3 eV) due to the introduction of occupied N 2p states. Local I-V measurements, carried out by conductive AFM (C-AFM), have revealed that the extrinsic doping of N atoms within the oxide can be a good way to precisely control the electrical conductivity of such p-type materials. (C) 2017 Elsevier B.V. All rights reserved.
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