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      p-Type conducting transparent characteristics of delafossite Mg-doped CuCrO2 thin films prepared by RF-sputtering

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          Abstract

          The growth of technologically relevant compounds, Mg-doped CuCrO 2 delafossite thin films, on a quartz substrate by radio-frequency sputtering is reported in this work.

          Abstract

          The growth of technologically relevant compounds, Mg-doped CuCrO 2 delafossite thin films, on a quartz substrate by radio-frequency sputtering is reported in this work. The deposition, performed at room temperature, leads to a nanocrystalline phase with extremely low roughness and high density. Delafossite characteristic diffraction peaks were obtained as a function of the thermal treatment under primary vacuum. The electrical conductivity was optimized until 1.6 S cm −1 with an optical transmittance of 63% in the visible range by a 600 °C annealing treatment under primary vacuum applied for 4 h. The transport properties were analyzed by Seebeck and Hall measurement, integrated spectrophotometry and optical simulation. These measurements highlighted degenerated semiconductor behavior using a hopping mechanism with a high hole concentration (10 21 cm −3) and a low mobility (0.2 cm 2 V −1 s −1). The direct optical bandgap of 3.3 eV has been measured according to Tauc's relationship. A refractive index of 2.3 at a wavelength of 1100 nm has been determined by spectroscopic ellipsometry and confirmed by two independent modellings of the optical transmittance and reflectance spectra. All these p-type TCO optoelectronic characteristics have led to the highest Haacke's figure of merit (1.5 × 10 −7 Ω −1) reported so far for such delafossite materials.

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          Most cited references 74

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          Berechnung verschiedener physikalischer Konstanten von heterogenen Substanzen. I. Dielektrizitätskonstanten und Leitfähigkeiten der Mischkörper aus isotropen Substanzen

           D. Bruggeman (1935)
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            Anomalous Optical Absorption Limit in InSb

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              Parameterization of the optical functions of amorphous materials in the interband region

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                Author and article information

                Journal
                JMCCCX
                Journal of Materials Chemistry C
                J. Mater. Chem. C
                Royal Society of Chemistry (RSC)
                2050-7526
                2050-7534
                2015
                2015
                : 3
                : 23
                : 6012-6024
                Affiliations
                [1 ]Université de Toulouse
                [2 ]Institut Carnot CIRIMAT – UMR CNRS-UPS-INP 5085
                [3 ]Université Paul Sabatier
                [4 ]31062 Toulouse Cedex 9
                [5 ]France
                Article
                10.1039/C5TC01070E
                © 2015
                Product
                Self URI (article page): http://xlink.rsc.org/?DOI=C5TC01070E

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