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Thermoelectric and Structural Characterization of Al-Doped ZnO/Y2O3 Multilayers

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The influence of Y2O3 nanolayers on thermoelectric performance and structure of 2% Al-doped ZnO (AZO) thin films has been studied. Multilayers based on five 50 nm thick AZO layers alternated with few nanometers thick Y2O3 layers were prepared by pulsed laser deposition on Al2O3 single crystals by alternate ablation of AZO target and Y2O3 target. The number of laser shots on Y2O3 target was maintained very low (5, 10 and 15 pulses in three separate experiments. The main phase (AZO) presents polycrystalline orientation and typical columnar growth not affected by the presence of Y2O3 nanolayers. The multilayer with 15 laser shots of Y2O3 showed best thermoelectric performance with electrical conductivity σ 48 S/cm and Seebeck coefficient S = −82 μV/K, which estimate power factor (S2·σ) about 0.03 × 10−3 W m−1 K−2 at 600 K. The value of thermal conductivity (κ) was found 10.03 W m−1 K−1 at 300 K, which is one third of typical value previously reported for bulk AZO. The figure of merit, ZT = S2·σ·T/κ, is calculated 9.6 × 10−4 at 600 K. These results demonstrated the feasibility of nanoengineered defects insertion for the depression of thermal conductivity.
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Keywords: Phonon Scattering; Thermal Conductivity; ZnO Multilayers

Document Type: Research Article

Affiliations: 1: Research Center for Environmentally Friendly Materials Engineering, Muroran Institute of Technology, 050-8585 Muroran, Japan 2: Department of Materials Science and Engineering, University of Utah, 84112 Salt Lake City, Utah, USA 3: Department of Mechanical and Aerospace Engineering, University of Virginia, 22904 Charlottesville, Virginia, USA 4: Department of Mechanical Engineering, Kyushu Institute of Technology, 804-0015 Kitakyushu, Japan 5: Electric Power Engineering Laboratory, Central Research Institute of Electric Power Industry (CRIEPI), 240-0101 Yokosuka, Japan 6: Department of Chemistry, Aalto University, 00076 Espoo, Finland

Publication date: 01 March 2017

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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