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Critical view on bu...
Critical view on buffer layer formation and monolayer graphene properties in high-temperature sublimation
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- Stanishev, Vallery (författare)
- Linköpings universitet,Linköping University,Halvledarmaterial,Tekniska fakulteten
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- Armakavicius, Nerijus (författare)
- Linköpings universitet,Linköping University,Halvledarmaterial,Tekniska fakulteten
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- Bouhafs, Chamseddine (författare)
- Linköpings universitet,Linköping University,Halvledarmaterial,Tekniska fakulteten
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- Coletti, Camilla (författare)
- Italian Institute of Technology,Ist Italiano Tecnol, Italy
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- Kuhne, Philipp (författare)
- Linköpings universitet,Linköping University,Halvledarmaterial,Tekniska fakulteten
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- Ivanov, Ivan Gueorguiev (författare)
- Linköpings universitet,Linköping University,Halvledarmaterial,Tekniska fakulteten
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- Zakharov, Alexei A. (författare)
- Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory,Lund Univ, Sweden
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- Yakimova, Rositsa (författare)
- Linköpings universitet,Linköping University,Halvledarmaterial,Tekniska fakulteten
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- Darakchieva, Vanya (författare)
- Linköpings universitet,Linköping University,Halvledarmaterial,Tekniska fakulteten
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(creator_code:org_t)
- 2021-02-21
- 2021
- Engelska 16 s.
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Ingår i: Applied Sciences (Switzerland). - : MDPI AG. - 2076-3417. ; 11:4, s. 1-16
- Relaterad länk:
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http://dx.doi.org/10... (free)
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https://www.mdpi.com...
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https://liu.diva-por... (primary) (Raw object)
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https://lup.lub.lu.s...
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https://doi.org/10.3...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- In this work we have critically reviewed the processes in high-temperature sublimation growth of graphene in Ar atmosphere using closed graphite crucible. Special focus is put on buffer layer formation and free charge carrier properties of monolayer graphene and quasi-freestanding monolayer graphene on 4H–SiC. We show that by introducing Ar at higher temperatures, TAr, one can shift the formation of the buffer layer to higher temperatures for both n-type and semi-insulating substrates. A scenario explaining the observed suppressed formation of buffer layer at higher TAr is proposed and discussed. Increased TAr is also shown to reduce the sp3 hybridization content and defect densities in the buffer layer on n-type conductive substrates. Growth on semi-insulating substrates results in ordered buffer layer with significantly improved structural properties, for which TAr plays only a minor role. The free charge density and mobility parameters of monolayer graphene and quasi-freestanding monolayer graphene with different TAr and different environmental treatment conditions are determined by contactless terahertz optical Hall effect. An efficient annealing of donors on and near the SiC surface is suggested to take place for intrinsic monolayer graphene grown at 2000◦C, and which is found to be independent of TAr . Higher TAr leads to higher free charge carrier mobility parameters in both intrinsically n-type and ambient p-type doped monolayer graphene. TAr is also found to have a profound effect on the free hole parameters of quasi-freestanding monolayer graphene. These findings are discussed in view of interface and buffer layer properties in order to construct a comprehensive picture of high-temperature sublimation growth and provide guidance for growth parameters optimization depending on the targeted graphene application.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- Buffer layer
- Epitaxial graphene on SiC
- Free charge carrier properties
- High-temperature sublimation
- Monolayer graphene
- Quasi-free-standing graphene
- Terahertz optical Hall effect
- epitaxial graphene on SiC; buffer layer; quasi-free-standing graphene; monolayer graphene; high-temperature sublimation; terahertz optical Hall effect; free charge carrier properties
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- art (ämneskategori)
- ref (ämneskategori)
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