A. Chin et al., STRONG ENHANCEMENT OF THE OPTICAL AND ELECTRICAL-PROPERTIES, AND SPONTANEOUS FORMATION OF AN ORDERED SUPERLATTICE IN (111)B ALGAAS, Journal of crystal growth, 150(1-4), 1995, pp. 436-440
Strong enhancement in the luminescence intensity is observed in Al0.22
Ga0.78As epitaxial layers grown on misoriented (111)B GaAs as compared
to those simultaneously grown on (100) GaAs. For a 1 degrees misorien
tation the luminescence intensity is almost 10 to 1000 times that of t
he (100) layers, depending on the growth temperature. Room temperature
electron mobility for 3 degrees misoriented (111)B Al0.18Ga0.82As is
19% higher than that for side-by-side grown (100). The strong luminesc
ence associated with a large red shift of 90 meV and the 19% mobility
enhancement are related to the long range composition ordering in (111
)B AlGaAs, which is observed by cross-sectional transmission electron
microscopy in a 280 Angstrom Al0.4GaAs quantum well heterostructure wi
th Al0.7GaAs barriers grown on (111)B GaAs substrates.