Patent ID: 8470652
Filing Date: 2013-06-25
Classification: H01L,H03F

Abstract:
1. A method of fabricating a monolithically integrated device comprising: growing a first set of Group III nitride epitaxial layers on a substrate for a first heterostructure field effect transistor; depositing a mask layer over the first set of Group III nitride epitaxial layers; selectively etching the mask layer to remove the mask layer in a first region; etching the first set of Group III nitride epitaxial layers in the first region; and growing a second set of Group III nitride epitaxial layers in the first region for a second heterostructure field effect transistor; wherein etching the first set of Group III nitride epitaxial layers in the first region comprises etching the first set of Group III nitride epitaxial layers in the first region to the substrate.