Patent ID: 7834423

Claim:
A nitride semiconductor device being produced by the steps of: preparing an AlxInyGa1−x−yN (0≦x≦1; 0≦y≦1; 0≦x+y≦1) defect position controlled substrate S including a closed loop network defect accumulating region H and low defect density regions ZY enclosed by the closed loop network defect accumulating region H, growing epitaxially AlujInvjGa1−uj−vjN (0≦uj≦1; 0≦vj≦1; 0≦uj+vj≦1) upper layers selectively on the low defect density regions ZY, forming upper layer parts B on the low defect density regions ZY, dissolving bottom parts of the upper layer parts B, separating the upper layer parts B as device chips C from the defect position controlled substrate S in a vertical direction, simultaneously separating the upper layer parts B from each other in horizontal directions, and forming bottom electrodes on bottoms of the upper layer parts B, the nitride semiconductor device being a mesa-shaped chip having a horizontal diameter with 0.2 mm to 50 mm and a thickness of 10 μm to 600 μm.