11-09
G.W.G. van Dreumel, P.T. Tinnemans, A.A.J.
van den Heuvel, T. Bohnen,
J.G. Buijnsters, J.J. ter Meulen, W.J.P. van Enckevort,
P.R. Hageman, E. Vlieg,
Realising epitaxial growth
of GaN on (001) diamond,
J. Appl. Phys. 110 (2011) 013503-1 – 013503-12
Abstract
By an extensive investigation of the principal growth parameters on the
deposition process, we realized the epitaxial growth of crystalline wurtzite GaN thin films on single
crystal (001) diamond substrates by metal organic chemical vapor deposition.
From the influence of pressure, V/III ratio, and temperature, it was deduced
that the growth process is determined by the mass-transport of gallium
precursor material toward the substrate. The highest temperature yielded an
improved epitaxial relationship between grown layer and substrate. X ray
diffraction (XRD) pole figure analysis established the presence of two domains
of epitaxial layers, namely (0001) < 10 (1) over bar0 > GaN parallel to (001)[110] diamond and (0001) < 10 (1)
over bar0 > GaN parallel to (001) [1 (1) over
bar0] diamond, which are 90 degrees rotated with respect to each other. The
presence of these domains is explained by the occurrence of areas of 2 x 1) and
1 x 2) surface reconstruction of the diamond substrate. When applying highly misoriented diamond substrates toward the [110] diamond
direction, one of the growth domains is suppressed and highly epitaxial GaN on (001) diamond is realized. (C) 2011 American
Institute of Physics. [doi:10.1063/1.3601351]