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Effect of synchroni...
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Nedfors, NilsLinköpings universitet,Tunnfilmsfysik,Tekniska fakulteten
(författare)
Effect of synchronized bias in the deposition of TiB2 thin films using high power impulse magnetron sputtering
- Artikel/kapitelEngelska2018
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A V S AMER INST PHYSICS,2018
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LIBRIS-ID:oai:DiVA.org:liu-148103
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https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-148103URI
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https://doi.org/10.1116/1.5003194DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
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Funding Agencies|Swedish Research Council (VR) [642-2013-8020]; Knut and Alice Wallenberg (KAW) Foundation [KAW 2015.0043]
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Titanium diboride thin films have been deposited from a compound TiB2 target on Si(001) substrates at a temperature of 500 degrees C using high power impulse magnetron sputtering (HiPIMS) at a frequency of 1000 Hz and pulse lengths of 20 and 40 mu s. A -60V bias pulse of different pulse length was applied at different time delay relative to the HiPIMS pulse. The average energy per deposited species, amp;lt; E-D amp;gt; = E-i(J(i)/J(t)), where E-i is the average ion energy and J(i)/J(t) is the ratio of the ion bombarding flux to the total flux of deposited species, is strongly dependent on bias mode. A change in preferred orientation from (101) to (001) is observed when amp;lt; E-D amp;gt; increase above 50 eV. The limited adatom mobility at amp;lt; E-D amp;gt; below 50 eV promote growth of fast growing planes resulting in a (101) texture, while amp;lt; E-D amp;gt; above 50 eV supply sufficient energy for development of the thermodynamically more favorable (001) texture. A linear increase in compressive residual stress with the increase in amp;lt; E-D amp;gt; is also found, due to more intensive Ar+ ion bombardment. Analysis of charge-state-resolved plasma chemistry and ion energy shows that the total flux of bombarding ions contains a higher fraction of B+ when the bias is applied in synchronous with the HiPIMS pulse instead of after, resulting in a lower residual stress at similar values of amp;lt; E-D amp;gt; (cf. -2.0 +/- 0.2 and -2.6 +/- 0.1 GPa). This study shows that use of a bias synchronized in different modes relative to the HiPIMS pulse, can be used as a tool to control amp;lt; E-D amp;gt; and to some extent the type of bombarding species, and hence the microstructure of TiB2 thin films. Published by the AVS.
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Vozniy, OleksiyLinköpings universitet,Tunnfilmsfysik,Tekniska fakulteten(Swepub:liu)olevo77
(författare)
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Rosén, JohannaLinköpings universitet,Tunnfilmsfysik,Tekniska fakulteten(Swepub:liu)johro07
(författare)
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Linköpings universitetTunnfilmsfysik
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Journal of Vacuum Science & Technology. A. Vacuum, Surfaces, and Films: A V S AMER INST PHYSICS36:30734-21011520-8559
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