Patent ID: 7405091

Claim:
A method for testing a contact open in a semiconductor device, comprising the steps of: performing a photolithography process for forming a contact; forming a contact hole by performing a contact etching process after sampling at least one wafer; performing the test for testing a contact open by sampling at least one wafer; depositing a conductive layer on the wafer provided with the contact hole; isolating the conductive layer within the contact hole by using one of a chemical mechanical process and an etch back process in order to test the contact open; performing a test for testing a contact open interface to check whether a remaining layer exists in an interface between the conductive layer and a lower structure of the conductive layer; performing a process for etching the contact of a main lot based on a test result; forming the conductive layer in the etched contact region; performing the isolation process, a test process of an electrical property and a test process of the contact open.