A. Dieguez et al., COMPETITIVE EVOLUTION OF THE FINE CONTRAST MODULATION AND CUPT ORDERING IN INGAP GAAS LAYERS/, Journal of applied physics, 80(7), 1996, pp. 3798-3803
We use transmission electron microscopy to characterize the morphology
of InGaP epitaxial layers grown by metal-organic vapor-phase epitaxy
over misoriented GaAs (001) substrates, with a cutoff angle in a range
from 0 degrees to 25 degrees. The occurrence of phase separation and
CuPt-type ordered superstructures has been observed. The most ordered
configuration has been found to appear in layers grown on 2 degrees of
f substrates, and the strength of order decreases with increasing the
misorientation angle beyond alpha=2 degrees. Conversely, whereas the p
hase separation is less evident in the layer grown at 2 degrees, the s
ample grown with a misorientation of 25 degrees exhibits the most phas
e separated configuration. The completion between these two phenomena
is discussed depending on the misorientation angle. (C) 1996 American
Institute of Physics.