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Physico chemistry of solids, thin films, biotechnologies
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New paper by Shanting 2017

Published on July 24, 2017
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Communique from July 25, 2017 to July 29, 2017

The paper "High quality epitaxial fluorine-doped SnO2 films by ultrasonic spray pyrolysis: in-depth structural and physical property investigation" has been published in Materials & Design

abs jamad.jpg

abs jamad.jpg

Here  you'll find Shan-Ting Zhang's paper

"Despite its wide use in the display and photovoltaic industries, fluorine-doped tin oxide (F:SnO2, FTO) has been studied only in its polycrystalline form. In this work, we report on the first growth of epitaxial FTO thin film by ultrasonic spray pyrolysis – a simple chemical deposition method – and we reveal the structure-property interplay by investigating in details its growth, morphology and strain/defects. Epitaxial FTO films are successfully grown on (110) rutile TiO2 single crystals and form mosaic domains with an out-of-plane distribution smaller than 0.5°, showing high structural quality comparable to epitaxial films prepared by molecular beam epitaxy and pulsed-laser deposition. Owing to the large lattice mismatch with rutile TiO2, the FTO film develops significant structural defects to release the epitaxial strain and is consequently nearly fully relaxed with a slight residual strain of 0.1–0.2%. With the help of an innovative nano-beam precession electron diffraction technique, the strain distribution is mapped at the TiO2/FTO interface, from which we identify the interfacial and secondary strain relaxation taking place mainly in the first 22 nm in the FTO film. The Hall-mobility of the epitaxial FTO films is close to the state-of-the-art and expected to improve further at lower doping concentrations."

 



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Written by David Munoz-Rojas

Date of update July 28, 2017

Communauté Université Grenoble Alpes