Patent ID: 10090406

Abstract:
A normally-off compound semiconductor device includes a first III-nitride semiconductor having a first sloped transition region in which the first III-nitride semiconductor transitions at an angle from a first level to a second level different than the first level, and a second III-nitride semiconductor on the first III-nitride semiconductor and having a different band gap than the first III-nitride semiconductor so that a two-dimensional charge carrier gas arises along an interface between the first and second III-nitride semiconductors. The normally-off compound semiconductor device further includes a gate on the second III-nitride semiconductor and a doped semiconductor over the first sloped transition region and interposed between the gate and the second III-nitride semiconductor. The two-dimensional charge carrier gas is disrupted along the first sloped transition region due solely to the slope of the first sloped transition region if steep enough, or also due to the presence of the doped semiconductor.