Use of plasma polymerized organosilicon films in fabrication of lift-off masks
First Claim
1. A lift-off method for forming a pattern on a substrate, comprising:
- A. blanket depositing a first film of a solvent soluble organic polymer on said substrate;
B. plasma polymerizing on said first film a second oxygen barrier film of an organosilicon polymer from an ambient containing monomers selected from the group consisting of organosilicones, organosilanes, organosilazanes, organosiloxanes and mixtures thereof said organosilicon polymer having the characteristic that it does not contain a preponderance of Si--O bonds relative to the number of Si--CH3 bonds;
C. forming a pattern of selected openings through said barrier film to expose corresponding portions of said first film; and
D. reactive ion etching said exposed portions of said first film in an oxygen containing ambient to form openings therein and extending therethrough to expose corresponding portions of said substrate.
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Abstract
Pinhole-free thin films deposited by glow discharge or plasma polymerization of organosilanes, organosilazones and organosiloxanes for use as reactive ion etch oxygen barriers in multilayer resist structures, of lift-off masks, for fabrication of semiconductor devices, such as integrated circuits. The process includes deposition of thin plasma polymerized organosilicon barrier film over a radiation insensitive polymeric base layer previously coated on a substrate, followed by thermal annealing of the plasma polymerized barrier layer, over which is then coated a radiation sensitive resist layer. After definition of the desired resist pattern by imagewise exposure and development, the image is etch transferred into the barrier layer by reactive sputter etching in a fluorine containing ambient, and subsequently transferred into the base layer, down to the substrate, in an oxygen plasma, during which time the plasma deposited film functions as an oxygen barrier. Final metal patterns are formed by metallization and lift-off steps.
68 Citations
29 Claims
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1. A lift-off method for forming a pattern on a substrate, comprising:
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A. blanket depositing a first film of a solvent soluble organic polymer on said substrate; B. plasma polymerizing on said first film a second oxygen barrier film of an organosilicon polymer from an ambient containing monomers selected from the group consisting of organosilicones, organosilanes, organosilazanes, organosiloxanes and mixtures thereof said organosilicon polymer having the characteristic that it does not contain a preponderance of Si--O bonds relative to the number of Si--CH3 bonds; C. forming a pattern of selected openings through said barrier film to expose corresponding portions of said first film; and D. reactive ion etching said exposed portions of said first film in an oxygen containing ambient to form openings therein and extending therethrough to expose corresponding portions of said substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification