Fabrication process for multilevel interconnections in a semiconductor device
First Claim
Patent Images
1. A fabrication process for a semiconductor device comprising the steps of:
- forming a plurality of lower level wiring, disposing insulation layer therebetween, on the surface of a silicon substrate;
forming a first silicon oxide layer covering the surfaces of said lower level wiring and the surface of said insulation layer by a first plasma chemical vapor deposition method;
forming an inorganic SOG film containing Si--H coupling and covering said first silicon oxide layer by applying a solution containing hydrogenated silsesquioxane ((HSiO3/2)n) as a primary component and pre-baking by a first thermal process;
performing reflow of said SOG film by a second thermal process at a temperature higher than that of said first thermal process;
forming a second silicon oxide layer covering the surface of reflown SOG film by a second plasma chemical vapor deposition; and
forming an upper level wiring over said second silicon oxide layer.
7 Assignments
0 Petitions
Accused Products
Abstract
After forming lower level wiring and plasma oxide layer, SOG film is applied by applying a solution containing hydrogen silsesquioxane as primary component under rotation. Pre-baking of the SOG film is performed by a first heat treatment and causes reflow thereof by a second heat treatment at a temperature higher than the first heat treatment. Subsequently, another plasma oxide layer is formed. By this, in an interlayer insulation layer including SOG film, occurrence of crack and so forth can be prevented and water resistance can be improved.
-
Citations
10 Claims
-
1. A fabrication process for a semiconductor device comprising the steps of:
-
forming a plurality of lower level wiring, disposing insulation layer therebetween, on the surface of a silicon substrate; forming a first silicon oxide layer covering the surfaces of said lower level wiring and the surface of said insulation layer by a first plasma chemical vapor deposition method; forming an inorganic SOG film containing Si--H coupling and covering said first silicon oxide layer by applying a solution containing hydrogenated silsesquioxane ((HSiO3/2)n) as a primary component and pre-baking by a first thermal process; performing reflow of said SOG film by a second thermal process at a temperature higher than that of said first thermal process; forming a second silicon oxide layer covering the surface of reflown SOG film by a second plasma chemical vapor deposition; and forming an upper level wiring over said second silicon oxide layer. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A fabrication process for a semiconductor device comprising the steps of:
-
forming a plurality of lower level wiring, disposing insulation layer therebetween, on the surface of a silicon substrate; forming a first silicon oxide layer covering the surfaces of said lower level wiring and the surface of said insulation layer by a first plasma chemical vapor deposition method; forming an inorganic SOG film containing Si--H coupling and covering said first silicon oxide layer by applying a solution containing hydrogenated silsesquioxane ((HSiO3/2)n) as a primary component and pre-baking by a first thermal process; performing reflow of said SOG film by a second thermal process at a temperature higher than that of said first thermal process; performing oxygen plasma process for the surface of the reflown SOG film; solidifying said SOG film processed by oxygen plasma process by a third thermal process at a temperature higher than said first thermal process; forming a second silicon oxide layer covering the surface of reflown SOG film by a second plasma chemical vapor deposition; and forming upper level wiring over said second silicon oxide layer. - View Dependent Claims (7, 8, 9, 10)
-
Specification