Patent ID: 8766279
Filing Date: 2014-07-01
Classification: H01L

Abstract:
1. A SiC-based trench-type Schottky device, comprising: a SiC substrate having a first surface and an opposing second surface; a first contact metal formed on the second surface of the SiC substrate and configured for forming an ohmic contact between the first contact metal and the SiC substrate; a SiC drift layer formed on the first surface of the SiC substrate and including a cell region and a termination region enclosing the cell region; a plurality of first spaced trenches with a first depth formed in the cell region; a plurality of second spaced trenches with a second depth formed in the termination region, wherein the second depth is less than the first depth; a plurality of mesas formed in the SiC drift layer, each defined between neighboring ones of the first and the second spaced trenches; an insulating layer formed on sidewalls and bottoms of the first and the second spaced trenches; and a second contact metal formed on the mesas and the insulating layer, extending from the cell region to the termination region, and configured for forming a Schottky contact between the second contact metal and the mesas of the SiC substrate.