Patent ID: 7732837

Claim:
A nitride semiconductor device comprising: an undoped first aluminum gallium nitride (Al x Ga 1-x N (0≦x≦1)) layer as a channel layer; an undoped or n-type second aluminum gallium nitride (Al y Ga 1-y N (0≦y≦1, x<y)) layer formed as a barrier layer on the first aluminum gallium nitride layer; a p-type third aluminum gallium nitride (Al z Ga 1-z N (0≦z≦1)) layer having portions formed in stripe-shaped recess portions formed at predetermined intervals to project over the second aluminum gallium nitride layer, a bottom surface of the third aluminum gallium nitride layer reaching the first aluminum gallium nitride layer by penetrating the second aluminum gallium nitride layer; a source electrode formed on the second aluminum gallium nitride layer to electrically connected to one ends of the stripe-shaped portions of the third aluminum gallium nitride layer formed in the recess portions; a drain electrode formed on the second aluminum gallium nitride layer to be spaced apart from the other ends of the stripe-shaped portions of the third aluminum gallium nitride layer; and a gate electrode formed on the second aluminum gallium nitride layer between the source electrode and the drain electrode in a side of the source electrode with respect to the other ends of the stripe-shaped portions of the third aluminum gallium nitride layer.