Patent ID: 9559198
Date: 2017-01-31
CPC Classifications: H01L

Claim:
1. A bi-directional trench field effect power transistor, comprising: a substrate with a substrate top surface; a layer stack extending over the substrate top surface, a first vertical trench and a second vertical trench being present in the layer stack, each of said first and second vertical trenches extending in a vertical direction from a top layer of the layer stack towards the substrate; a first current terminal and a second current terminal, the first current terminal being situated in said vertical direction below the second current terminal and the second current terminal being situated on or above the top layer; and an electrical path which can be selectively enabled or disabled to allow current to flow in a first direction or a second direction, opposite to the first direction, between the first current terminal and the second current terminal, the electrical path comprising: wherein the first vertical trench and the second vertical trench have the same of option (a) and/or (b); option (a) being: option (b) being: each of said first and second vertical trenches comprising: