Patent ID: 7257893

Claim:
A method of forming metal layers having substantially same thicknesses on wafers including features with varying depths, comprising: forming a first conductive layer on a first wafer including a first top surface and a first feature having a first depth, the first conductive layer filling the first feature and extending over the first top surface; forming a second conductive layer on a second wafer including a second top surface and a second feature having a second depth which is substantially different than the first depth, the second conductive layer filling the second feature and extending over the second top surface, wherein a thickness of the first layer over the first top surface is substantially the same as a thickness of the second layer over the second top surface, and wherein forming the first and second conductive layers results in a first metallization pattern in the first top surface that is different from a second metallization pattern in the second top surface; and removing the first conductive layer from the first top surface and the second conductive layer from the second top surface using substantially same process conditions.