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Doping of metastable Cu3N at different Ni concentrations: Growth, crystallographic sites and resistivity
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry. AB Sandvik Coromant R&D, Lerkrogsvagen 19, SE-1280 Stockholm, Sweden..
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.
2018 (English)In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 647, p. 1-8Article in journal (Refereed) Published
Abstract [en]

Copper nitride, Cu3N, is a metastable material whose properties can be changed considerably by doping with metals which opens for a variety of applications in several areas (sensors, electrical connects, batteries, memories, etc.). The present work is a systematic study in the system Cu-Ni-N of preferences regarding occupation of interstitial and substitutional crystallographic sites in the Cu3N structure as the metal dopant level increases and how the occupation influences growth behavior, texture, microstructure and resistivity. Ni doped Cu3N films of different chemical composition were grown by a gas-pulsed Chemical Vapor Deposition technique. The occupation of the different crystallographic sites of the Cu3N by the Ni atoms was obtained from analysis of X-ray diffraction data. At low Ni content, less than about 21% in metal content, Ni replaced the Cu atoms in the structure. In the intermediate Ni metal content range from about 21 to 40% the vacant centre position became available. After filling the centre position, substitution of Cu for Ni occurred up to a Ni content of about 80% (Cu0.8Ni3.2N) which is the solid solubility limit of Ni in Cu3N. The film resistivity decreased rapidly by adding nickel to the Cu3N structure from about 10(9)mu Omega.cm without any Ni doping to about 100 mu Omega.cm with 80% Ni in the metal content. After filling the centre position the change in resistivity when Cu atoms were substituted for Ni was very small. Finally, the growth mechanism, texture and microstructure changed significantly with the uptake of Ni atoms in the structure.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE SA , 2018. Vol. 647, p. 1-8
Keywords [en]
Copper nitride, Metal doping, Solid solubility, Cell parameters, Resistivity, Growth mechanism, Microstructure
National Category
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-341567DOI: 10.1016/j.tsf.2017.12.010ISI: 000419649200001OAI: oai:DiVA.org:uu-341567DiVA, id: diva2:1182028
Funder
Swedish Research Council, 7048301Available from: 2018-02-12 Created: 2018-02-12 Last updated: 2018-02-12Bibliographically approved

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Lindahl, ErikOttosson, MikaelCarlsson, Jan-Otto

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