A layer of Anti Reflective Coating (ARC) is first deposited over the
surface of a silicon based or oxide based semiconductor surface, a dual
hardmask is deposited over the surface of the layer of ARC. A layer of
soft mask material is next coated over the surface of the dual hardmask
layer, the layer of soft mask material is exposed, creating a soft mask
material mask. The upper layer of the dual hardmask layer is next
patterned in accordance with the soft mask material mask, the soft mask
material mask is removed from the surface. The lower layer of the
hardmask layer is then patterned after which the layer of ARC is
patterned, both layers are patterned in accordance with the patterned
upper layer of the dual hardmask layer. The substrate is now patterned in
accordance with the patterned upper and lower layer of the dual hardmask
layer and the patterned layer of ARC. The patterned upper and lower
layers of the hardmask layer and the patterned layer of ARC are removed
from the surface of the silicon based or oxide based semiconductor
surface.