Early stages of growth and crystal structure evolution of boron nitride thin films. (19th April 2016)

• Record Type: Journal Article
• Authors: Henry, Anne; Chubarov, Mikhail; Czigány, Zsolt; Garbrecht, Magnus; Högberg, Hans
• Is Part Of: Japanese journal of applied physics. Volume 55:Number 5(2016:May)Supplement
• Publication Date: 2016-04-19
• Subjects: Physics -- Periodicals; 621.05
• DOI: 10.7567/JJAP.55.05FD06
• Languages: English
• ISSNs: 0021-4922

Abstract

Abstract: A study of the nucleation and crystal structure evolution at the early stages of the growth of sp 2 -BN thin films on 6H-SiC and α-Al2 O3 substrates is presented. The growth is performed at low pressure and high temperature in a hot wall CVD reactor, using ammonia and triethylboron as precursors, and H2 as carrier gas. From high-resolution transmission electron microscopy and X-ray thin film diffraction measurements we observe that polytype pure rhombohedral BN (r-BN) is obtained on 6H-SiC substrates. On α-Al2 O3 an AlN buffer obtained by nitridation is needed to promote the growth of hexagonal BN (h-BN) to a thickness of around 4 nm followed by a transition to r-BN growth. In addition, when r-BN is obtained, triangular features show up in plan-view scanning electron microscopy which are not seen on thin h-BN layers. The formation of BN after already one minute of growth is confirmed by X-ray photoelectron spectroscopy.