Study of carbon doped cobalt mononitride thin films
| Autor: | Akhil Tayal, Wolfgang Caliebe, Mukul Gupta, Yogesh Kumar |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Extended X-ray absorption fine structure Diffusion Analytical chemistry General Physics and Astronomy chemistry.chemical_element 02 engineering and technology Surfaces and Interfaces General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Thermal diffusivity 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films chemistry ddc:660 Thermal stability Thin film 0210 nano-technology Absorption (electromagnetic radiation) Spectroscopy Cobalt |
| Zdroj: | Applied surface science 564, 150443 (2021). doi:10.1016/j.apsusc.2021.150443 |
| ISSN: | 0169-4332 |
| Popis: | Applied surface science 564, 150443 (2021). doi:10.1016/j.apsusc.2021.150443 In this work, we address the issue of N diffusion in cobalt mononitride (CoN) thin films. The diffusivity of N in CoN is the highest among 3-transition metal nitrides, causing a gradient in N concentration across the depth. In order to reduce N-diffusion and to improve the thermal stability, we doped various amounts of C in CoN. The long-range ordering of samples was investigated using x-ray diffraction. Elemental depth profiles were investigated using secondary ion mass spectroscopy, exhibiting a gradient in the depth profile towards the surface of undoped CoN film and the gradient decreases with an increase in C-doping. The local structure of samples was studied using x-ray absorption near-edge spectroscopy at N and Co -edges and extended x-ray absorption fine structure (EXAFS) at Co -edge. Defects and vacancies due to N-diffusion can also be seen from the EXAFS spectra of the undoped sample which minimizes at some optimum amount of C-doping. The thermal stability also gets improved at this optimum amount of C-doping. The obtained results can be utilized in the energy sector in which CoN finds many applications such as a high capacity electrode for Li-ion batteries, non-aqueous supercapacitors, and solar cells. Published by Elsevier, Amsterdam |
| Databáze: | OpenAIRE |
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