ONE-STEP GROWTH OF BURIED HETEROSTRUCTURES BY CHEMICAL BEAM EPITAXY OVER PATTERNED INP SUBSTRATES

We studied the formation of buried heterostructures obtained in a sing le growth step over nonplanar substrates patterned with ridges. When t he ridge dimensions are large enough, the growth on the mesa top is si milar to that on a planar substrate. In contrast, ridge spacings below almost-equal-to 10 mum influence the composition of the alloys grown on the ridge as well as those grown in the valley centre. The possible surface mechanisms which may explain this behaviour are discussed.