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Preparation and Characterization of Tin Oxide Films by Ion-Assisted Deposition

Published online by Cambridge University Press:  03 September 2012

W. K. Choi ,
J. S. Cho ,
S. K. Song ,
Y. T. Kim ,
K. H. Yoon ,
H.-J. Jung  and
S. K. Koh
W. K. Choi
Affiliation:
Division of Ceramics, Korea Institute of Science and Technology, Cheongryang P.O. Box 131, Seoul, Korea
J. S. Cho
Affiliation:
Division of Ceramics, Korea Institute of Science and Technology, Cheongryang P.O. Box 131, Seoul, Korea
S. K. Song
Affiliation:
Division of Ceramics, Korea Institute of Science and Technology, Cheongryang P.O. Box 131, Seoul, Korea
Y. T. Kim
Affiliation:
Division of Ceramics, Korea Institute of Science and Technology, Cheongryang P.O. Box 131, Seoul, Korea
K. H. Yoon
Affiliation:
Department of Ceramic Engineering, Yonsei University, Sudaemoon Ku, Shincheon Dong, Seoul 120–749, Korea
H.-J. Jung
Affiliation:
Division of Ceramics, Korea Institute of Science and Technology, Cheongryang P.O. Box 131, Seoul, Korea
S. K. Koh
Affiliation:
Division of Ceramics, Korea Institute of Science and Technology, Cheongryang P.O. Box 131, Seoul, Korea
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Abstract

Undoped tin oxide films were grown on Si substrates by a reactive ion-assisted deposition technique in which oxygen ions were irradiated on depositing Sn particles. In order to investigate the oxidation from SnO to SnO2, the effects of initial oxygen contents and heat treatment on the final crystalline structure of tin oxide films were thoroughly examined. Oxygen to Sn metal ratio (No/Nsn) of as-deposited films were controlled from 1.1 to 1.9 by varying the relative arrival ratio (F) of oxygen ion to Sn particle from 0.025 to 0.1. Heat treatment was carried out in two different ways; one was post vacuum-annealing at 400 ∼ 600°C and the other was in-situ annealing 400 ∼ 500°C. Crystalline structure of as-deposited tin oxide films at room temperature was amorphous. After post-annealing at 400°C, only SnO phase was found below No/Nsn= 1.6 in x-ray diffraction and crystalline structure of the films comprising higher oxygen contents still appeared to be amorphous. Even though the films still showed SnO phase until Γ50 after 500°C post-annealing, however, mixed structures of SnO, SnO2, and intermediate Sn2O3/Sn3O4 were observed for the films Γ75 and Γ100 with higher oxygen contents. At 600°C annealing, perfect SnO2 phase was attained for the films having No/Nsn=1.9. On the other hand, pure polycrystalline SnO2 films could be obtained by in-situ annealing at low temperature. The values of No/Nsn and the chemical shifts with the variation of oxidation were carefully determined by the comparison of Sn MNN and O KLL Auger transitions. Surface microstructure of deposited films was also analyzed using a scanning electron microscopy (SEM) and an atomic force microscope (AFM).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 438: Symposium A – Materials Modificaton and Synthesis by Ion Beam… , 1996 , 683
Copyright
Copyright © Materials Research Society 1997

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