Nb-doped TiO2 thin films for photovoltaic applications |
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| Affiliation: | 1. Department of Physics and Engineering, Moldova State University, A. Mateevici str. 60, MD 2009 Chisinau, Republic of Moldova;2. Faculty of Physics, Alexandru Ioan Cuza University, 11 Carol I Blvd., 700506 Iasi, Romania;1. Optotransmitter-Umweltschutz-Technologie e.V., Köpenicker Str. 325, 12555 Berlin, Germany;2. Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany;3. Central Lab of Solar Energy and New Energy Sources at the Bulg. Acad. Sci., Blvd. Tzarigradsko shose 72, Sofia, Bulgaria |
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| Abstract: | Polycrystalline titania and Nb:TiO2 thin films were deposited by RF magnetron sputtering. The influence of post-deposition annealing in vacuum and hydrogen atmosphere on the structure, morphology, oxidation states and optical properties was studied by X-ray diffraction, atomic force microscopy, XPS and UV–VIS spectroscopy. The heat treatment of titanium dioxide thin films in vacuum and H2 atmosphere induces structural and morphological changes. The band gap narrowing was observed for the transparent as-deposited Nb:TiO2 films, while annealing at 420 °C in H2 atmosphere resulted in an enhancement of the electrical conductivity. Further on, TiO2/p-CdTe photovoltaic devices with efficiency of 1.8% were fabricated and their characteristic ‘enhancement’ is discussed. |
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