Patent ID: 6486502
Filing Date: 2002-11-26
Classification: H01L

Abstract:
A high electron mobility transistor (HEMT) comprising:a semi-insulating substrate (1); an aluminum nitride buffer layer (12) on said substrate; and an insulating gallium nitride layer (13) on said buffer layer; and characterized by an active structure (14) of aluminum gallium nitride on said gallium nitride layer; respective source, drain, and gate contacts (20, 21, 22) to said aluminum gallium nitride active structure, and a passivation layer (23) for enhancing the flow of electrons in said active structure, said passivation layer being selected from the group consisting of silicon dioxide and silicon nitride on said aluminum gallium nitride active structure, said passivation layer covering contact portions of the source, drain and gate contacts and possessing windows to permit electrical connections to said source, gate and drain contacts.