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Open AccessFeature PaperArticle

Deposition Kinetics of Thin Silica-Like Coatings in a Large Plasma Reactor

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Elvez Ltd., Ulica Antona Tomšiča 35, 1294 Višnja Gora, Slovenia
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Jozef Stefan International Postgraduate School, Jamova cesta 39, 1000 Ljubljana, Slovenia
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Faculty of Electrical Engineering and Computer Science, University of Maribor, Koroška Cesta 46, 2000 Maribor, Slovenia
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Department of Surface Engineering, Jozef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia
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Plasmadis Ltd., Teslova ulica 30, 1000 Ljubljana, Slovenia
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Author to whom correspondence should be addressed.
Materials 2019, 12(19), 3238; https://doi.org/10.3390/ma12193238
Received: 20 August 2019 / Revised: 25 September 2019 / Accepted: 28 September 2019 / Published: 3 October 2019
(This article belongs to the Special Issue Hybrid and Composite Coatings and Thin Films)
An industrial size plasma reactor of 5 m3 volume was used to study the deposition of silica-like coatings by the plasma-enhanced chemical vapor deposition (PECVD) method. The plasma was sustained by an asymmetrical capacitively coupled radio-frequency discharge at a frequency of 40 kHz and power up to 7 kW. Hexamethyldisilioxane (HMDSO) was introduced continuously at different flows of up to 200 sccm upon pumping with a combination of roots and rotary pumps at an effective pumping speed between 25 and 70 L/s to enable suitable gas residence time in the plasma reactor. The deposition rate and ion density were measured continuously during the plasma process. Both parameters were almost perfectly constant with time, and the deposition rate increased linearly in the range of HMDSO flows from 25 to 160 sccm. The plasma density was of the order of 1014 m−3, indicating an extremely low ionization fraction which decreased with increasing flow from approximately 2 × 10−7 to 6 × 10−8. The correlations between the processing parameters and the properties of deposited films are drawn and discussed. View Full-Text
Keywords: plasma-enhanced chemical vapor deposition (PECVD); hexamethyldisiloxane (HMDSO); industrial-size plasma reactor; capacitively coupled radiofrequency (RF) discharge; ion density; real time deposition rate measurement; time-of-flight secondary ion mass spectrometry (ToF-SIMS) plasma-enhanced chemical vapor deposition (PECVD); hexamethyldisiloxane (HMDSO); industrial-size plasma reactor; capacitively coupled radiofrequency (RF) discharge; ion density; real time deposition rate measurement; time-of-flight secondary ion mass spectrometry (ToF-SIMS)
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Gosar, Ž.; Đonlagić, D.; Pevec, S.; Kovač, J.; Mozetič, M.; Primc, G.; Vesel, A.; Zaplotnik, R. Deposition Kinetics of Thin Silica-Like Coatings in a Large Plasma Reactor. Materials 2019, 12, 3238.

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