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Growth of epitaxial CeO2 buffer layers by polymer assisted deposition

Published online by Cambridge University Press:  11 July 2012

A. Calleja ,
R. B. Mos ,
P. Roura ,
J. Farjas ,
J. Arbiol ,
L. Ciontea ,
X. Obradors  and
T. Puig
A. Calleja*
Affiliation:
Institut de Ciència de Materials de Barcelona-Consejo Superior de Investigaciones Científicas (ICMAB-CSIC), Bellaterra, Catalonia, Spain
R. B. Mos
Affiliation:
Institut de Ciència de Materials de Barcelona-Consejo Superior de Investigaciones Científicas (ICMAB-CSIC), Bellaterra, Catalonia, Spain Technical University of Cluj, Cluj-Napoca, Romania
P. Roura
Affiliation:
GRMT, Dept. of Physics, University of Girona, Campus Montilivi, Edif. PII, E17071 Girona, Catalonia, Spain
J. Farjas
Affiliation:
GRMT, Dept. of Physics, University of Girona, Campus Montilivi, Edif. PII, E17071 Girona, Catalonia, Spain
J. Arbiol
Affiliation:
Institut de Ciència de Materials de Barcelona-Consejo Superior de Investigaciones Científicas (ICMAB-CSIC), Bellaterra, Catalonia, Spain Institució Catalana de Recerca i Estudis Avançats (ICREA), 08010, Barcelona, Catalonia, Spain
L. Ciontea
Affiliation:
Technical University of Cluj, Cluj-Napoca, Romania
X. Obradors
Affiliation:
Institut de Ciència de Materials de Barcelona-Consejo Superior de Investigaciones Científicas (ICMAB-CSIC), Bellaterra, Catalonia, Spain
T. Puig
Affiliation:
Institut de Ciència de Materials de Barcelona-Consejo Superior de Investigaciones Científicas (ICMAB-CSIC), Bellaterra, Catalonia, Spain
*
*Corresponding author at: acalleja@icmab.es
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Abstract

Polymer assisted deposition (PAD) has been reported as a novel CSD approach for thin film growth with improved homogeneity and long stability by forming a metal polymer species. It also offers the interesting possibility of having a library of PAD solutions for each precursor metal and obtaining the required composition by simple mixing. Another potential advantage is the increase in thickness since mechanical stresses are expected to be alleviated during shrinkage in the metalorganic decomposition by the metal-polymer network.

Cerium oxide films on YSZ single crystals were grown from water-based solutions containing cerium nitrate, polyethyleneimine and complexing EDTA, in order to explore the benefits of using the PAD approach for growing buffer layers in coated conductors. An ultrafiltration step was performed to remove the non-coordinated species in solution. The degree of purification and efficiency in the cerium recovery was investigated by different techniques. TGA-DTA analysis was used to provide guidance to the best thermal profiles in different atmospheres and specially to diminish the adverse effects of exothermic events during decomposition. Microstructural evolution was tracked by AFM and TEM, while epitaxial fraction was followed by X-ray diffraction. The results show the high importance of choosing the proper atmosphere and the need for tuning of heating ramps to obtain dense, flat and epitaxial ceria films by PAD.

Keywords

chemical synthesispolymerfilm
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1449: Symposium BB – Solution Synthesis of Inorganic Films and Nanostructured Materials , 2012 , mrss12-1449-bb06-17
Copyright
Copyright © Materials Research Society 2012

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References

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