Article (Scientific journals)
Controlling electrical and optical properties of zinc oxide thin films grown by thermal atomic layer deposition with oxygen gas
Nguyen, Tai; Adjeroud, Noureddine; Guennou, Mael et al.
2020In Results in Materials, 6, p. 100088
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Keywords :
Zinc oxide thin film; Atomic layer deposition; Oxygen chemisorption; Polar surface stabilization; Electrical properties; Optical properties
Abstract :
[en] The preparation of ZnO thin films with controlled electrical resistivity and optical properties is often challenged by the presence of defects, such as oxygen vacancies or interstitial zinc. Here, we investigate the material properties of ZnO polycrystalline thin films prepared by thermal Atomic Layer Deposition (ALD) with the presence of molecular oxygen pulsing during the growth. By means of structural, electrical and optical characterizations, we identify key growth parameters of this unusual ALD process. Unexpectedly, the influence of oxygen molecules on the crystallography, microstructure and morphology of ZnO films is significant from hundred-nanometers to micrometer thick film. The electrical resistivity of the films grown with oxygen gas shows a dramatic increase from 3 to 4 orders of magnitude. Additionally, photoluminescence measurements reveal that deep-level emissions caused by defects located deep in the band gap can be reduced by applying an adequate pulsing of oxygen gas during the process. Finally, we conclude with a discussion about the degree of consistency between the chemical composition, the inner strain and the optical and electrical properties of the films obtained with the different thermodynamic parameters of growth. Several hypotheses are discussed in order to understand the dominance of (002) orientation in the presence of oxygen during the ALD growth process.
Research center :
LIST - Luxembourg Institute of Science & Technology
Disciplines :
Physics
Author, co-author :
Nguyen, Tai
Adjeroud, Noureddine
Guennou, Mael  ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
Guillot, Jérôme
Fleming, Yves ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC)
Papon, Anne-Marie
Arl, Didier
Menguelti, Kevin
Joly, Raoul
Gambacorti, Narciso
Polesel-Maris, Jérôme
External co-authors :
yes
Language :
English
Title :
Controlling electrical and optical properties of zinc oxide thin films grown by thermal atomic layer deposition with oxygen gas
Publication date :
02 April 2020
Journal title :
Results in Materials
ISSN :
2590-048X
Publisher :
Elsevier, Amsterdam, Netherlands
Volume :
6
Pages :
100088
Peer reviewed :
Peer Reviewed verified by ORBi
FnR Project :
FNR10935404 - Materials For Sensing And Energy Harvesting, 2015 (01/10/2016-31/03/2023) - Emmanuel Defay
Funders :
FNR - Fonds National de la Recherche [LU]
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