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Title | High Band Gap Nanocrystalline Tungsten Carbide (nc-WC) Thin Films Grown by Hot Wire Chemical Vapor Deposition (HW-CVD) Method |
Authors |
Bharat, Gabhale
Ashok, Jadhawar Ajinkya, Bhorde Shruthi, Nair Haribhau, Borate Ravindra, Waykar Rahul, Aher Priyanka, Sharma Amit, Pawbake Sandesh, Jadkar |
ORCID | |
Keywords |
WC films HW-CVD Low angle XRD Raman spectroscopy XPS |
Type | Article |
Date of Issue | 2018 |
URI | http://essuir.sumdu.edu.ua/handle/123456789/69259 |
Publisher | Sumy State University |
License | Copyright not evaluated |
Citation | High Band Gap Nanocrystalline Tungsten Carbide (nc-WC) Thin Films Grown by Hot Wire Chemical Vapor Deposition (HW-CVD) Method [Текст] / G. Bharat, J. Ashok, B. Ajinkya [et al.] // Журнал нано- та електронної фізики. - 2018. - Т.10, № 3. - 03001. - DOI: 10.21272/jnep.10(3).03001. |
Abstract |
In present study nanocrystalline tungsten carbide (nc-WC) thin films were deposited by HW-CVD
using heated W filament and CF4 gas. Influence of CF4 flow rate on structural, optical and electrical properties
has been investigated. Formation of WC thin films was confirmed by low angle XRD, Raman spectroscopy
and x-ray photoelectron spectroscopy (XPS) analysis. Low angle XRD analysis revealed that WC
crystallites have preferred orientation in (101) direction and with increase in CF4 flow rate the volume
fraction of WC crystallites and its average grain size increases. Formation of nano-sized WC was also confirmed
by transmission electron microscopy (TEM) analysis. UV-Visible spectroscopy analysis revealed increase
in optical transmission with increase in CF4 flow rate. The WC film deposited for 40 sccm of CF4
flow rate show high transparency (- 80-85 %) ranging from visible to infrared wavelengths region. The
band gap shows increasing trend with increase in CF4 flow rate (3.48-4.18 eV). The electrical conductivity
measured using Hall Effect was found in the range - 103-141 S/cm over the entire range of CF4 flow rate
studied. The obtained results suggest that these wide band gap and conducting nc-WC films can be used as
low cost counter electrodes in DSSCs and co-catalyst in electrochemical water splitting for hydrogen production. |
Appears in Collections: |
Журнал нано- та електронної фізики (Journal of nano- and electronic physics) |
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File | Size | Format | Downloads |
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JNEP_03001.pdf | 656.9 kB | Adobe PDF | -975705883 |
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