Development of thick-film thermoelectric microgenerators based on p-type Ca3Co4O9 and n-type (ZnO)5In2O3 legs

Abstract An alternative to the expensive and time-consuming processing of bulk thermoelectric microgenerators (TEGs) could be the structuring of TEGs by means of screen-printing technology. In comparison with conventional TEGs made from alloys, an oxide-based semiconducting TEG could have many advantages, such as non-toxicity, thermal stability and oxidation resistance at high temperatures. Two types of thermoelectric microgenerators (TEGs) made by screen-printing on alumina substrates, one from a Ca3Co4O9 (Ca349) p-type leg and the other from a (ZnO)5In2O3 (Z5I) n-type leg, are presented. The overall performance of the devices was determined by measuring the electrical conductivity and the Seebeck coefficient of the Ca3Co4O9- and (ZnO)5In2O3-based thick-film thermopiles in the temperature range from room temperature to 500 °C. Their microstructural properties, such as grain morphology, density, phase composition and interface with the substrate, were also investigated, with the goal being to determine the optimum firing conditions for the best TEG properties. Our study defines a promising fabrication method for oxide-based thermoelectric devices and identifies the main challenges associated with microgenerator fabrication.

[1]  S. Lambert,et al.  Three forms of the misfit layered cobaltite [Ca2CoO3] [CoO2]1.62 a 4D structural investigation , 2001 .

[2]  A. Searcy,et al.  Sublimation and Thermodynamic Properties of Zinc Oxide , 1964 .

[3]  V. Nemchinsky,et al.  Thermoelectric figure of merit of metal–semiconductor barrier structure based on energy relaxation length , 1998 .

[4]  Kyung Cheol Choi,et al.  Thin-Film Thermoelectric Module for Power Generator Applications Using a Screen-Printing Method , 2011 .

[5]  H. Ohta,et al.  Thermoelectric Properties of Homologous Compounds in the ZnO–In2O3 System , 1996 .

[6]  Wei Yu,et al.  Effect of microstructure on the thermoelectric properties of CSD-grown Bi2Sr2Co2Oy thin films , 2013 .

[7]  S. Bernik,et al.  Preparation and influence of highly concentrated screen-printing inks on the development and characteristics of thick-film varistors , 2015 .

[8]  Ryoji Funahashi,et al.  Thermoelectric Ceramics for Energy Harvesting , 2013 .

[9]  D. Chateigner,et al.  Anisotropy of the Mechanical and Thermoelectric Properties of Hot‐Pressed Single‐Layer and Multilayer Thick Ca3Co4O9 Ceramics , 2011 .

[10]  Song Chen,et al.  Effect of precursor calcination temperature on the microstructure and thermoelectric properties of Ca3Co4O9 ceramics , 2012, Journal of Sol-Gel Science and Technology.

[11]  I. Terasaki High-temperature oxide thermoelectrics , 2011, 1107.2530.

[12]  D. Clarke,et al.  Relation between thermolectric properties and phase equilibria in the ZnO–In2O3 binary system , 2014 .

[13]  P. Markowski Thick‐film photoimageable and laser‐shaped arms for thermoelectric microgenerators , 2011 .

[14]  Nini Pryds,et al.  Microstructure and Thermoelectric Properties of Screen-Printed Thick Films of Misfit-Layered Cobalt Oxides with Ag Addition , 2012, Journal of Electronic Materials.

[15]  Andreas Willfahrt,et al.  Screen Printed Thermoelectric Devices , 2014 .

[16]  Myung-Hyun Lee,et al.  A study of electrodes for thermoelectric oxides , 2013, Electronic Materials Letters.

[17]  J. Seto The electrical properties of polycrystalline silicon films , 1975 .

[18]  Kyu Hyoung Lee,et al.  Oxide-based thermoelectric power generation module using p-type Ca3Co4O9 and n-type (ZnO)7In2O3 legs , 2011 .

[19]  Yongheng Zhang,et al.  Microstructure and temperature coefficient of resistivity for ZnO ceramics doped with Al2O3 , 2006 .

[20]  Y. Miyazaki Crystal structure and thermoelectric properties of the misfit-layered cobalt oxides , 2004 .

[21]  G. J. Snyder,et al.  Complex thermoelectric materials. , 2008, Nature materials.