Patent ID: 9111942
Filing Date: 2015-08-18
Classification: H01L

Abstract:
1. A method of making a local interconnect structure, comprising: providing a semiconductor substrate; forming a dielectric layer on the semiconductor substrate; forming a first film layer patterned on a first surface portion of the dielectric layer; forming a sidewall spacer having a thickness only on sidewalls of the first film layer to surround the first film layer on the dielectric layer by a patterning process; further patterning the sidewall spacer by removing a portion of the sidewall spacer to expose a second surface portion of the dielectric layer and to leave a pattern made by remainng sidewall spacer; forming a second film layer on the exposed second surface portion of the dielectric layer, wherein the second film layer has a top surface substantially flushed with a top surface of the remaining sidewall spacer; removing the remaining sidewall spacer to form a first opening such that the first opening has a same pattern as the pattern of the remaining sidewall spacer; etching the dielectric layer via the first opening to expose a surface of the semiconductor substrate to form a second opening through the dielectric layer, the second opening having the same pattern; and filling the second opening with a conductive material to form a local interconnect structure having the same pattern as the pattern of the remaining sidewall spacer after the further patterning.