Patent ID: 7670949

Claim:
A method of manufacturing a semiconductor device, comprising: forming a first photosensitive material having a first opening hole, the first photosensitive material being positioned over a first work target layer, the first work target layer being positioned over a substrate; forming a second work target layer having a first concave portion having a first depth by performing a first etching treatment to the first work target layer using the first photosensitive material as a mask; forming a second photosensitive material having a second opening hole by enlarging the first opening hole of the first photosensitive material; and forming a third work target layer having a second concave portion having a second depth by performing a second etching treatment to the second work target layer using the second photosensitive material as a mask, the second concave portion having a first part and a second part, the first part being interposed between the second part and the substrate, the second depth being larger than the first depth, the second depth being equal or larger than a thickness of the first work target layer.