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Title: Size effects on thermoelectric behavior of ultrathin Na{sub x}CoO{sub 2} films

Size effects in thermoelectric Na{sub x}CoO{sub 2} thin films are studied, focusing on the electrical resisitivity and Seebeck coefficient. For very thin films below 10 nm, we have observed an increase in resistivity, which is in agreement with theoretical models. In contrast to a predicted simultaneous suppression of the Seebeck coefficient for ultrathin films, we observe a constant Seebeck coefficient as a function of layer thickness due to changes in the structural properties as well as the presence of strong electron correlations. This preserved high Seebeck coefficient opens up new directions for Na{sub x}CoO{sub 2} ultrathin films as basic building blocks in thermoelectric superlattices with enhanced phonon scattering.
Authors:
; ;  [1]
  1. Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE, Enschede (Netherlands)
Publication Date:
OSTI Identifier:
22391981
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 19; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COBALT OXIDES; ELECTRIC CONDUCTIVITY; LAYERS; PHONONS; SCATTERING; SEEBECK EFFECT; SODIUM COMPOUNDS; SUPERLATTICES; THERMOELECTRICITY; THIN FILMS