Patent ID: 6194306
Filing Date: 2001-02-27
Classification: H01L

Abstract:
A method of forming contacts for a memory device, comprising the steps of:providing a mask having a pattern comprising:a plurality of substantially rectangular shapes arranged longitudinally in each of a plurality of substantially parallel rows;the substantially rectangular shapes in each row offset from the substantially rectangular shapes of neighboring rows;the substantially rectangular shapes defining a plurality of T-shapes connected to and offset from each other;providing a substrate comprising:a plurality of word line structures protruding from a surface of an underlying layer;a conductive layer disposed outwardly of the word line structures and the surface of the underlying layer;using the mask to define a plurality of substantially rectangular sections in the conductive layer to be etched, the substantially rectangular sections corresponding to the substantially rectangular shapes of the pattern;etching the substantially rectangular sections to leave a plurality of T-shaped sections in the conductive layer, the T-shaped sections corresponding to the T-shapes of the pattern; andremoving an upper portion of conductive layer disposed outwardly of the word line structures to form a plurality of individual contacts from a lower portion of each T-shape section.