Patent ID: 7271429

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 stripe-shaped portions formed at predetermined intervals in a predetermined region on 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; a drain electrode formed on the second aluminum gallium nitride layer to be spaced apart form 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, and formed between the stripe-shaped portions of the third aluminum gallium nitride layer separately from the stripe-shaped portions of the third aluminum gallium nitride layer.