High modulus, low dielectric constant coatings
First Claim
1. A method of making a plasma treated coating comprising:
- providing a thermally cured porous network coating produced from a resin containing at least 2 Si—
H groups, wherein the porous network coating has an initial dielectric constant and an initial elastic modulus; and
plasma treating the porous network coating to reduce an amount of SiH bonds and to provide a plasma treated coating having a second dielectric constant which is greater than the initial dielectric constant, and a second elastic modulus which is greater than the initial elastic modulus.
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Abstract
Low dielectric constant films with improved elastic modulus. The method of making such coatings involves providing a porous network coating produced from a resin containing at least 2 Si—H groups where the coating has been thermally cured and has a dielectric constant in the range of from about 1.1 to about 3.5, and plasma treating the coating to convert the coating into porous silica. Plasma treatment of the network coating yields a coating with improved modulus, but with a higher dielectric constant. The coating is plasma treated for between about 15 and 120 seconds at a temperature less than or about 350° C. The plasma treated coating can optionally be annealed. Rapid thermal processing (RTP) of the plasma treated coating reduces the dielectric constant of the coating while maintaining an improved elastic modulus as compared to the initial porous coating. The annealing temperature is preferably in excess of or about 350° C., and the annealing time is preferably at least or about 120 seconds. The annealed, plasma treated coating has a dielectric constant in the range of from about 1.1 to about 2.4 and an improved elastic modulus.
477 Citations
19 Claims
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1. A method of making a plasma treated coating comprising:
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providing a thermally cured porous network coating produced from a resin containing at least 2 Si—
H groups, wherein the porous network coating has an initial dielectric constant and an initial elastic modulus; and
plasma treating the porous network coating to reduce an amount of SiH bonds and to provide a plasma treated coating having a second dielectric constant which is greater than the initial dielectric constant, and a second elastic modulus which is greater than the initial elastic modulus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification