Patent ID: 11508837

Abstract:
An epitaxial structure for a high-electron-mobility transistor includes a substrate, a nucleation layer, a buffer layered unit, a channel layer, and a barrier layer sequentially stacked on one another in such order. The buffer layered unit includes at least one multiple quantum well structure containing a plurality of p-i-n heterojunction stacks. Each of the p-i-n heterojunction stacks includes p-type, i-type, and n-type layers which are alternately stacked along a direction away from the nucleation layer, and which are made of materials respectively represented by chemical formulas of AlxGa(1-x)N, AlyGa(1-y)N, and AlzGa(1-z)N. For each of the p-i-n heterojunction stacks, x gradually decreases and z gradually increases along the direction away from the nucleation layer, and y is consistent and ranges from 0 to 0.7.