Patent ID: 9620362
Date: 2017-04-11
CPC Classifications: H01L

Claim:
1. A semiconductor device, comprising: a substrate; a first III-V (group III-group V) seed layer disposed over the substrate, wherein the first III-V seed layer has a first ratio of group V atoms to group III atoms; a second III-V seed layer disposed over the first III-V seed layer, wherein the second III-V seed layer has a second ratio of group V atoms to group III atoms, wherein the first III-V seed layer and the second III-V seed layer meet at a saw-toothed interface; a third III-V seed layer disposed over the second III-V seed layer, wherein the third III-V seed layer has a third ratio of group V atoms to group III atoms, wherein the second ratio is greater than the third ratio so the second III-V seed layer is group-V-poor relative to the third III-V seed layer; and at least one device layer of III-V material disposed over the third III-V seed layer.