Patent ID: 9171914
Filing Date: 2015-10-27
Classification: H01L

Abstract:
1. A semiconductor device comprising: a first semiconductor layer having n-type conductivity; a second semiconductor layer joined to said first semiconductor layer at a first junction, said semiconductor layer having p-type conductivity; a cathode electrode joined to said first semiconductor layer; an anode electrode joined to said second semiconductor layer and covering an upper surface of said second semiconductor layer, said anode electrode and said second semiconductor layer having coincident side surface boundaries; a third electrode joined to said first semiconductor layer at a second junction, said third electrode having a Schottky contact property to said first semiconductor layer, wherein said first semiconductor layer is made of a group-III nitride having a composition of Al said second semiconductor layer is made of a group-IV semiconductor material having a smaller band gap than said group-III nitride, an energy level at a top of a valence band of said first semiconductor layer is lower than an energy level at a top of a valence band of said second semiconductor layer in the vicinity of said first junction, and said anode electrode and said third electrode are connected in parallel, wherein said second semiconductor layer is deposited on a partial region of a main surface of said first semiconductor layer to create said first junction, and said third electrode is formed directly on and covers an upper surface and side surfaces of said anode electrode, side surfaces of said second semiconductor layer, and a portion of an upper surface of said first semiconductor layer adjoining said second semiconductor layer to create said second junction adjacent to said first junction.