Plasma ashing process for removing photoresist and residues during ferroelectric device fabrication
View Patent ↗A low temperature plasma ashing process for use with substrates comprising a ferroelectric material. The process generally includes plasma ashing the photoresist and residues at a temperature of about room temperature to about 140° C., wherein the plasma is generated from a gas mixture consisting essentially of hydrogen and an inert gas, and wherein the ferroelectric material is exposed to the plasma.
1. A method for removing photoresist and residues from a substrate comprising a ferroelectric material, which comprises:
plasma ashing the photoresist and residues at a temperature of about room temperature to about 140° C., wherein the plasma is generated from a gas mixture consisting essentially of hydrogen and an inert gas, and wherein the ferroelectric material is exposed to the plasma.
2. The method of claim 1 , wherein the inert gas is selected from the group consisting of argon, helium, xenon, krypton, and neon.
3. The method of claim 1 , wherein the gas mixture consists essentially of hydrogen and helium.
4. The method of claim 1 , wherein the ferroelectric material comprises a polymer, a ceramic, or a mineral.
5. The method of claim 1 , wherein the ferroelectric material comprises a polymer comprising polyvinylidine fluoride, polyvinylidine fluoride-trifluoroethylene, polyvinylidine fluoride tetrafluoroethylene, polyvinylidine fluoride trifluoroethylene-hexafluoropropylene, polyvinylidine fluoride-hexafluoropropylene, polyvinylidene fluoride-trifluorethylene-chlorofluoroethylene, polyvinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene, polyvinylidene fluoride-tetrafluoroethylene-chlorotrifluoroethylene, polyvinylidene fluoride-trifluorethylene-hexafluoroethylene, polyvinylidene fluoride-tetrafluorethylene-hexafluoroethylene, polyvinylidene fluoride-trifluorethylene-tetrafluoroethylene, polyvinylidene fluoride-tetrafluorethylene-tetrafluoroethylene, polyvinylidene fluoride-trifluorethylene-vinyl fluoride, polyvinylidene fluoride-tetrafluorethylene-vinyl fluoride, polyvinylidene fluoride-trifluorethylene-perfluoro(methyl vinyl ether), polyvinylidene fluoride-tetrafluorethylene-perfluoro(methyl vinyl ether), polyvinylidene fluoride-trifluorethylene-bromotrifluoroethylene, polyvinylidene fluoride-tetrafluorethylene-bromotrifluoroethylene, polyvinylidene fluoride-tetrafluorethylene-chlorofluoroethylene, polyvinylidene fluoride-trifluorethylene-vinylidene chloride, or polyvinylidene fluoride-tetrafluorethylene-vinylidene chloride.
6. The method of claim 1 , wherein the temperature is about 50° C. to about 130° C.
7. The method of claim 1 , wherein the gas mixture consists essentially of hydrogen at about 1 to about 20 percent by volume and inert gas at about 80 to about 99 percent by volume based on the total volume of the gas mixture.
8. The method of claim 1 , further comprising rinsing the substrate with deionized water.
9. The method of claim 1 , further comprising rinsing the substrate with a wet chemical stripper.
10. The method of claim 1 , wherein the temperature is about 50° C. to about 100° C.
11. A method for removing photoresist and residues from a substrate comprising a polymer ferroelectric material, which comprises:
plasma ashing a crust portion of a photoresist layer at a temperature of about room temperature to about 140° C., wherein the plasma is generated from a gas mixture consisting essentially of hydrogen and an inert gas, and wherein the polymer ferroelectric material is exposed to the plasma; and
wet cleaning to remove a remaining portion of the photoresist layer underlying the crust portion.
12. The method of claim 11 , wherein the polymer ferroelectric material comprises polyvinylidine fluoride, polyvinylidine fluoride-trifluoroethylene, polyvinylidine fluoride tetrafluoroethylene, polyvinylidine fluoride trifluoroethylene-hexafluoropropylene, polyvinylidine fluoride-hexafluoropropylene, polyvinylidene fluoride-trifluorethylene-chlorofluoroethylene, polyvinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene, polyvinylidene fluoride-tetrafluoroethylene-chlorotrifluoroethylene, polyvinylidene fluoride-trifluorethylene-hexafluoroethylene, polyvinylidene fluoride-tetrafluorethylene-hexafluoroethylene, polyvinylidene fluoride-trifluorethylene-tetrafluoroethylene, polyvinylidene fluoride-tetrafluorethylene-tetrafluoroethylene, polyvinylidene fluoride-trifluorethylene-vinyl fluoride, polyvinylidene fluoride-tetrafluorethylene-vinyl fluoride, polyvinylidene fluoride-trifluorethylene-perfluoro(methyl vinyl ether), polyvinylidene fluoride-tetrafluorethylene-perfluoro(methyl vinyl ether), polyvinylidene fluoride-trifluorethylene-bromotrifluoroethylene, polyvinylidene fluoride-tetrafluorethylene-bromotrifluoroethylene, polyvinylidene fluoride-tetrafluorethylene-chlorofluoroethylene, polyvinylidene fluoride-trifluorethylene-vinylidene chloride, or polyvinylidene fluoride-tetrafluorethylene-vinylidene chloride.
13. The method of claim 11 , wherein the temperature is about 50° C. to about 130° C.
14. The method of claim 11 , wherein the gas mixture consists essentially of hydrogen at about 1 to about 20 percent by volume and the inert gas at about 80 to about 99 percent by volume based on the total volume of the gas mixture.
15. The method of claim 11 , further comprising rinsing the substrate with deionized water.
16. The method of claim 11 , wherein the temperature is about 50° C. to about 100° C.
17. The method of claim 11 , wherein the inert gas is selected from the group consisting of argon, helium, xenon, krypton, and neon.
18. The method of claim 11 , wherein the gas mixture consists essentially of hydrogen and helium.
19. A method for removing photoresist and residues from a substrate comprising a ferroelectric polymer, the method comprising:
exposing the substrate to a plasma ashing process, wherein the plasma ashing process comprises generating a plasma from a gas mixture consisting essentially of hydrogen and an inert gas at a temperature less than about 140° C. and at a pressure of about 0.1 to about 3 Torr; and
volatilizing the photoresist and residues from the substrate without damaging the ferroelectric polymer.
20. The method of claim 19 , wherein the gas mixture consists essentially of hydrogen at about 1 to about 20 percent by volume and helium at about 80 to about 99 percent by volume based on the total volume of the gas mixture.
21. The method of claim 19 , wherein the inert gas is selected from the group consisting of argon, helium, xenon, krypton, and neon.
22. The method of claim 19 , wherein the gas mixture consists essentially of hydrogen and helium.