Patent ID: 8841702
Filing Date: 2014-09-23
Classification: H01L

Abstract:
1. A method of forming a III-N semiconductor device, comprising: forming a nitride channel layer, the composition of the nitride channel layer being selected from the group consisting of nitrides of gallium, indium, and aluminum, and combinations thereof; forming an AlXN layer adjacent the channel layer, wherein X is selected from the group consisting of gallium, indium, and their combination; forming a gate, wherein the nitride channel layer includes a first channel region beneath the gate, and two channel access regions on opposite sides of the first channel region; and forming an n-doped GaN layer adjacent the AlXN layer in the areas adjacent to the channel access regions, but not in the area adjacent to the first channel region; wherein the concentration of Al in the AlXN layer, the AlXN layer thickness, and the n-doping concentration in the n-doped GaN layer are selected to induce a 2DEG charge in the channel access regions without inducing any substantial 2DEG charge in the first channel region in the absence of a switching voltage applied to the gate, so that a channel of the device is not conductive in the absence of the switching voltage applied to the gate, but becomes conductive when a switching voltage greater than a threshold voltage is applied to the gate.