Patent ID: 7524760

Claim:
A method for manufacturing semiconductor device, comprising: forming an interlayer dielectric layer on a semiconductor substrate having a conductive layer; forming a first photoresist layer having a predetermined thickness on the interlayer dielectric layer; exposing an entire surface of the first photoresist layer; forming a shielding layer on the exposed first photoresist layer; forming a second photoresist layer on the shielding layer and patterning the second photoresist layer to expose a portion of the shielding layer; etching the exposed portion of the shielding layer using the second photoresist layer as a mask; developing and removing a predetermined portion of the first photoresist layer exposed by the etched shielding layer; etching a predetermined portion of the interlayer dielectric layer exposed by the removing of the predetermined portion of the first photoresist layer to form a hole; sequentially removing the second photoresist layer, shielding layer and the first photoresist layer after forming the hole; forming a diffusion barrier layer on the hole and the interlayer dielectric layer after removing the second photoresist layer, shielding layer and the first photoresist layer; and forming a seed layer on the diffusion barrier layer, wherein developing and removing a predetermined portion of the first photoresist layer forms an undercut at lower portions of the first photoresist layer.