Patent ID: 9142407
Filing Date: 2015-09-22
Classification: H01L

Abstract:
1. A semiconductor structure, comprising: a substrate; a first III-V compound layer over the substrate, the first III-V compound layer having a first type doping; one or more sets of III-V compound layers over the first III-V compound layer, each set of the one or more sets of III-V compound layers comprising a lower III-V compound layer and an upper III-V compound layer over the lower III-V compound layer, the upper III-V compound layer having the first type doping, and the lower III-V compound layer being at least one of undoped, unintentionally doped having a second type doping, or doped having the second type doping; a second III-V compound layer over the one or more sets of III-V compound layers, the second III-V compound layer being either undoped or unintentionally doped having the second type doping; and an active layer over the second III-V compound layer, wherein the first III-V compound layer has a thickness greater than that of the corresponding upper III-V compound layer of any one of the one or more sets of III-V compound layers by at least 0.05 μm, and wherein, the first III-V compound layer has a doping concentration greater than that of the corresponding upper III-V compound layer of any one of the two or more sets of III-V compound layers.