Patent ID: 6387820
Filing Date: 2002-05-14
Classification: H01L,Y10S

Abstract:
A method of manufacturing a semiconductor device, the method comprising:(a) forming a layer of oxide containing first metal structures electrically communicating with electrodes of active devices formed in an underlying substrate; (b) forming a barrier layer on the layer of oxide; (c) forming a layer of metal on the barrier layer; (d) forming an antireflection layer on the layer of metal; (e) forming a hard mask layer on the antireflection layer; (f) forming a layer of photoresist on the hard mask layer; (g) patterning and developing the layer of photoresist to leave second metal structures communicating with first metal structures; (h) an etch process to etch through the layer of a hard mask layer; (i) an etch process to etch through the antireflection layer; (j) an etch process to etch about 80% of the layer of metal; (k) a first overetch step for a first selected time; and (l) a second overetch step for a second selected time.