Patent ID: 9054171
Filing Date: 2015-06-09
Classification: H01L

Abstract:
1. A HEMT semiconductor device comprising: a first semiconductor layer of a first conductivity type or an intrinsic type; a second semiconductor layer of the first conductivity type or the intrinsic type disposed above the first semiconductor layer; a control electrode disposed above the second semiconductor layer; and third semiconductor layers of a second conductivity type, each of which includes a first upper portion in contact with the first semiconductor layer, a second upper portion located at a lower position than the first upper portion, a first side portion located between the first upper portion and the second upper portion, and a second side portion located at a lower position than the first side portion, wherein the control electrode is placed immediately above one of the third semiconductor layers, an area of a region surrounded by the second side portion in a vicinity of the second upper portion is twice or more times as large as an area of a region surrounded by the first side portion in a vicinity of the second upper portion, and a level of the first upper portion of the one of the third semiconductor layers placed immediately below the control electrode is lower than a level of the first upper portion of other third semiconductor layers placed other than immediately below the control electrode.