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Chemical vapour deposition of epitaxial rhombohedral BN thin films on SiC substrates
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology. Not Found: Linkoping Univ, Dept Phys Chem and Biol, SE-58183 Linkoping, Sweden .
Linköping University, Department of Physics, Chemistry and Biology, Chemistry. Linköping University, The Institute of Technology.ORCID iD: 0000-0002-7171-5383
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
Hungarian Academic Science, Hungary .
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2014 (English)In: CrystEngComm, ISSN 1466-8033, E-ISSN 1466-8033, Vol. 16, no 24, 5430-5436 p.Article in journal (Refereed) Published
Abstract [en]

Epitaxial growth of rhombohedral boron nitride (r-BN) on different polytypes of silicon carbide (SiC) is demonstrated using thermally activated hot-wall chemical vapour deposition and triethyl boron and ammonia as precursors. With respect to the crystalline quality of the r-BN films, we investigate the influence of the deposition temperature, the precursor ratio (N/B) and the addition of a minute amount of silicon to the gas mixture. From X-ray diffraction and transmission electron microscopy, we find that the optimal growth temperature for epitaxial r-BN on the Si-face of the SiC substrates is 1500 degrees C at a N/B ratio of 642 and silicon needs to be present not only in the gas mixture during deposition but also on the substrate surface. Such conditions result in the growth of films with a c-axis identical to that of the bulk material and a thickness of 200 nm, which is promising for the development of BN films for electronic applications.

Place, publisher, year, edition, pages
Royal Society of Chemistry , 2014. Vol. 16, no 24, 5430-5436 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-108816DOI: 10.1039/c4ce00381kISI: 000336839900032OAI: oai:DiVA.org:liu-108816DiVA: diva2:732883
Available from: 2014-07-07 Created: 2014-07-06 Last updated: 2017-12-05
In thesis
1. Chemical Vapour Deposition of sp2 Hybridised Boron Nitride
Open this publication in new window or tab >>Chemical Vapour Deposition of sp2 Hybridised Boron Nitride
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The aim of this work was to develop a chemical vapour deposition process and understand the growth of sp2 hybridised Boron Nitride (sp2-BN). Thus, the growth on different substrates together with the variation of growth parameters was investigated in details and is presented in the papers included in this thesis. Deposited films of sp2-BN were characterised with the purpose to determine optimal deposition process parameters for the growth of high crystal quality thin films with further investigations of chemical composition, morphology and other properties important for the implementation of this material towards electronic, optoelectronic devices and devices based on graphene/BN heterostructures.

For the growth of sp2-BN triethyl boron and ammonia were employed as B and N precursors, respectively. Pure H2 as carrier gas is found to be necessary for the growth of crystalline sp2-BN. Addition of small amount of silane to the gas mixture improves the crystalline quality of the growing sp2-BN film.

It was observed that for the growth of crystalline sp2-BN on c-axis oriented α-Al2O3 a thin and strained AlN buffer layer is needed to support epitaxial growth of sp2-BN, while it was possible to deposit rhombohedral BN (r-BN) on various polytypes of SiC without the need for a buffer layer. The growth temperature suitable for the growth of  crystalline sp2-BN is 1500 °C. Nevertheless, the growth of crystalline sp2-BN was also observed on α-Al2O3 with an AlN buffer layer at a lower temperature of 1200 °C. Growth at this low temperature was found to be hardly controllable due to the low amount of Si that is necessary at this temperature and its accumulation in the reaction cell. When SiC was used as a substrate at the growth temperature of 1200 °C, no crystalline sp2-BN was formed, according to X-ray diffraction.

Crystalline structure investigations of the deposited films showed formation of twinned r-BN on both substrates used. Additionally, it was found that the growth on α-Al2O3 with an AlN buffer layer starts with the formation of hexagonal BN (h-BN) for a thickness of around 4 nm. The formation of h-BN was observed at growth temperatures of 1200 °C and 1500 °C on α-Al2O3 with AlN buffer layer while there were no traces of h-BN found in the films deposited on SiC substrates in the temperature range between 1200 °C and 1700 °C. As an explanation for such growth behaviour, reproduction of the substrate crystal stacking is suggested.  Nucleation and growth mechanism are investigated and presented in the papers included in this thesis.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2014. 54 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1632
National Category
Physical Sciences
Identifiers
urn:nbn:se:liu:diva-112580 (URN)10.3384/diss.diva-112580 (DOI)978-91-7519-193-5 (ISBN)
Public defence
2015-02-10, Planck, Fysikhuset, Campus Valla, Linköpings universitet, Linköping, 09:15 (English)
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Available from: 2014-12-04 Created: 2014-12-04 Last updated: 2015-03-11Bibliographically approved

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Pedersen, HenrikHögberg, HansHenry, Anne

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