Patent ID: 9698141
Date: 2017-07-04
CPC Classifications: H01L

Claim:
1. A semiconductor device comprising: a first nitride semiconductor layer having a first region; a second nitride semiconductor layer that is on the first nitride semiconductor layer and contains carbon and silicon; a third nitride semiconductor layer that is on the second nitride semiconductor layer and has a second region; a fourth nitride semiconductor layer on the third nitride semiconductor layer, the fourth nitride semiconductor layer having a band gap that is wider than a band gap of the third nitride semiconductor layer; a source electrode that is on the fourth nitride semiconductor layer and is electrically connected to the first region; a drain electrode that is on the fourth nitride semiconductor layer and is electrically connected to the second region; a gate electrode that is on the fourth nitride semiconductor layer and is between the source electrode and the drain electrode; a conductive substrate; a buffer layer between the conductive substrate and the first nitride semiconductor layer, the buffer layer having an electrical resistance higher than an electrical resistance of the conductive substrate; a first through electrode passing through the conductive substrate and the buffer layer and electrically connecting the first region and the source electrode; and a second through electrode passing through the fourth nitride semiconductor layer and electrically connecting the second region and the drain electrode.