Patent ID: 8815688
Filing Date: 2014-08-26
Classification: H01L

Abstract:
1. A method of manufacturing a power device, the method comprising: forming a first drift region on a substrate; forming a passivation layer on the first drift region; forming a trench by patterning the first drift region with the passivation layer; forming a second drift region by growing n-gallium nitride (GaN) in the trench, and alternately disposing the first drift region and the second drift region; forming a source electrode contact layer on the second drift region; forming a drain electrode on one side of the substrate which is an opposite side of the first drift region; forming an n-GaN layer directly on the second drift region; etching the source electrode contact layer and the n-GaN layer; forming a gate insulating film in the etched portion of the source electrode contact layer and the n-GaN layer; forming a source electrode on the source electrode contact layer; and forming a gate electrode on the gate insulating film, wherein a doping concentration of an n-type dopant doped on the n-GaN layer is higher than that of the second drift region, and wherein the second drift region has a portion disposed on the passivation layer formed on the first drift region.