Growth of 4H epilayers has been achieved by chemical vapour deposition
on various substrate orientations which were on-(0001) oriented, off
axis (3.5 degrees- and 8 degrees-off towards the (11 (2) over bar 0) d
irection) and a-cut, both (11 (2) over bar 0) and (10 (1) over bar 0)-
oriented material. Various characterisation techniques have been used
to assess the epilayer quality such as optical microscopy, X-ray diffr
action, and mainly photoluminescence spectroscopy. (C) 1997 Elsevier S
cience S.A.