Patent ID: 8187942

Claim:
A method for manufacturing a semiconductor device, comprising the steps of: forming a first insulation layer on a semiconductor substrate which has a first region and a second region; forming a barrier layer on the first insulation layer; forming a mask pattern on the barrier layer to expose the second region; removing a portion of the barrier layer which is exposed in the second region to expose a portion of the first insulation layer; removing the portion of the first insulation layer exposed in the second region and removing the entire thickness of the mask pattern in the first region; removing the barrier layer that remains in the first region; and forming a second insulation layer on the first insulation layer in the first region and on the semiconductor substrate in the second region, wherein removal of the portion of the first insulation layer exposed in the second region and removal of the entire thickness of the mask pattern in the first region is conducted using an etching solution comprising propylene glycol, HF and amine.