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Thermoelectric conversion via laser-induced voltage in highly textured polycrystalline NaxCoO2 ceramic

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Yu,  L.
Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society;
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Wang,  Y.
Department Nanoscale Science (Klaus Kern), Max Planck Institute for Solid State Research, Max Planck Society;

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Zhang,  H.
Former Research Groups, Max Planck Institute for Solid State Research, Max Planck Society;
Scientific Facility Crystal Growth (Masahiko Isobe), Max Planck Institute for Solid State Research, Max Planck Society;
Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society;

/persons/resource/persons280716

Zhang,  P. X.
Scientific Facility Crystal Growth (Masahiko Isobe), Max Planck Institute for Solid State Research, Max Planck Society;
Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society;

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Habermeier,  H.-U.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;
Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society;
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Yan, G. W., Yu, L., Wang, Y., Zhang, H., Zhang, P. X., & Habermeier, H.-U. (2011). Thermoelectric conversion via laser-induced voltage in highly textured polycrystalline NaxCoO2 ceramic. Journal of Applied Physics, 110(10): 103102.


Cite as: https://hdl.handle.net/21.11116/0000-000E-BF5B-6
Abstract
We have studied and analyzed the laser-induced voltage effect in highly c-axis-oriented polycrystalline Na(x)CoO(2). The textured and layered stacking Na(x)CoO(2) (x similar to 0.7) bulks were prepared by a solid-state reaction process. Under the irradiation on Na(0.67)CoO(2) bulk surface with pulsed laser (lambda = 248 nm), the induced voltage signals were observed on the inclined surface with rise time 30 ns-43 ns and peak voltage 200 mV-500 mV; the voltage peak values show a linear dependence of laser energy densities. The crystal grains orientation plays a critical role in voltage peak value whether in film or texture bulk. The transverse voltage signal brings the information of thermoelectric anisotropy. In Na(x)CoO(2) band structure, the Fermi surface is different in the ab plane and along the c axis, leading to anisotropy of Seebeck coefficient. Additionally, the artificial structure of the inclined surface for highly textured bulk enables us to obtain a transverse voltage on inclined surface. These results demonstrated the layered textured bulk has potential applications in waste-heat conversion via transverse thermoelectric effect. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3660781]