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 A NEXAFS and XPS study of oxygen doped Cu3N
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
Instituto de Ciencia de Materiales de Madrid.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Materials Science.
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(English)In: Journal of Physics D: Applied Physics, ISSN 0022-3727, E-ISSN 1361-6463Article in journal (Refereed) Submitted
Abstract [en]

Thin films of pure and oxygen doped Cu3N, deposited by Chemical Vapour Deposition, have been studied with the NEXAFS technique both in the FLY and TEY mode and compared with XPS results.  Cu, CuO and Cu2O have been used as reference samples in the investigation for detection of surface oxidation and contaminants. The aim has been to investigate how and if the chemical environment changes around Cu, N and O upon incorporation of oxygen in the Cu3N lattice. The recorded NEXAFS spectra are discussed in terms of valence electrons, crystal structure and local bonding environment. It was found that basically two oxygen absorption sites are possible in the crystal structure, (½, ½, 0) and (¼, ¼, ¼), and that the oxygen distribution between the two sites is probably given by the oxygen concentration.

Place, publisher, year, edition, pages
IOP Publishing Ltd.
Keyword [en]
Copper nitride, oxygen doping, NEXAFS, XPS and doping sites
National Category
Inorganic Chemistry
Research subject
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-110526OAI: oai:DiVA.org:uu-110526DiVA: diva2:277198
Available from: 2009-11-16 Created: 2009-11-16 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Chemical Vapour Deposition of Undoped and Oxygen Doped Copper (I) Nitride
Open this publication in new window or tab >>Chemical Vapour Deposition of Undoped and Oxygen Doped Copper (I) Nitride
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In science and technology there is a steadily increased demand of new materials and new materials production processes since they create new application areas as well as improved production technology and economy. This thesis includes development and studies of a chemical vapour deposition (CVD) process for growth of thin films of the metastable material copper nitride, Cu3N, which is a semiconductor and decomposes at around 300 oC. The combination of these properties opens for a variety of applications ranging from solar cells to sensor and information technology.

The CVD process developed is based on a metal-organic compound copper hexafluoroacetylacetonate, Cu(hfac)2 , ammonia and water and was working at about 300 oC and  5 Torr. It was found that a small amount of water in the vapour increased the growth rate considerably and that the phase content, film texture, chemical composition and morphology were strongly dependent on the deposition conditions.

In-situ oxygen doping during the CVD of Cu3N to an amount of 9 atomic % could also be accomplished by increasing the water concentration in the vapour. Oxygen doping increases the band gap of the material as well as the electrical resistivity and changes the stability. The crystal structure of Cu3N is very open and contains several sites which can be used for doping. Different spectroscopic techniques like X-ray photoelectron spectroscopy, Raman spectroscopy and near edge X-ray absorption fine structure spectroscopy were used to identify the oxygen doping site(s) in Cu3N. Besides the properties, the oxygen doping also affected the morphology and texture of the films.

By combining thin layers of different materials several properties can be optimized at the same time. It has been demonstrated in this thesis that multilayers, composed of alternating Cu3N and Cu2O layers, i.e. a metastable and a stable material, could be grown by CVD technique. However, the stacking sequence affected the texture, morphology and chemical composition. The interfaces between the different layers were sharp and no signs of decomposition of the initially deposited metastable Cu3N layer could be detected.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2010. 52 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 691
Keyword
Chemical vapour deposition, copper hexafluoroacetylacetonate, copper (I) nitride, copper (I) oxide, multilayers, oxygen doping
National Category
Organic Chemistry
Research subject
Inorganic Chemistry
Identifiers
urn:nbn:se:uu:diva-110533 (URN)978-91-554-7665-6 (ISBN)
Public defence
2010-01-08, Häggsalen, The Ångstöm Laboratory, Lägerhyddsvägen 1, Uppsala, 10:15 (English)
Opponent
Supervisors
Available from: 2009-12-09 Created: 2009-11-16 Last updated: 2009-12-09

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