Fluorine-passivated reticles for use in lithography and methods for fabricating the same
Fluorine-passivated reticles for use in lithography and methods for fabricating and using such reticles are provided. According to one embodiment, a method for performing photolithography comprises placing a fluorine-passivated reticle between an illumination source and a target semiconductor wafer and causing electromagnetic radiation to pass from the illumination source through the fluorine-passivated reticle to the target semiconductor wafer. In another embodiment, a fluorine-passivated reticle comprises a substrate and a patterned fluorine-passivated absorber material layer overlying the substrate. According to another embodiment, a method for fabricating a reticle for use in photolithography comprises providing a substrate and forming a fluorine-passivated absorber material layer overlying the substrate.
1. A method for fabricating a reticle for use in photolithography, the method comprising the steps of:
providing a substrate; and
forming a fluorine-passivated absorber material layer overlying the substrate, the fluorine-passivated absorber material layer comprising a patterned fluorine-passivated absorber material having a fluorinated surface, wherein forming the fluorine-passivated absorber material layer comprises the steps of:
forming an absorber material layer overlying the substrate;
patterning the absorber material layer; and
fluorinating the absorber material layer after the step of patterning the absorber material layer.
2. The method of claim 1 , further comprising the step of depositing an antireflective coating overlying the fluorine-passivated absorber material layer.
3. The method of claim 1 , wherein the step of fluorinating the absorber material layer comprises exposing the absorber material layer to fluorine gas.
4. The method of claim 1 , wherein the step of fluorinating the absorber material layer comprises subjecting the absorber material layer to a photochemical fluorination process.
5. The method of claim 4 , wherein the step of subjecting the absorber material layer to a photochemical fluorination process comprises the steps of:
exposing the absorber material layer to a fluorinating agent that decomposes photochemically upon exposure to ultraviolet radiation to form fluorine ions; and
irradiating the fluorinating agent with ultraviolet radiation.
6. The method of claim 5 , wherein the step of exposing the absorber material layer to a fluorinating agent that decomposes photochemically upon exposure to ultraviolet radiation comprises exposing the absorber material layer to a fluorinating agent selected from the group consisting of graphite fluoride, hydrogen fluoride, a fluoro-alkyl halogen, a compound having a hexafluoroacetone moiety, and combinations thereof.
7. The method of claim 1 , wherein the step of fluorinating the absorber material layer comprises subjecting the absorber material layer to a thermal fluorination process.
8. The method of claim 7 , wherein the step of subjecting the absorber material layer to a thermal fluorination process comprises the steps of:
exposing the absorber material layer to a fluorinating agent that decomposes upon exposure to heat to form fluorine ions; and
heating the fluorinating agent.
9. The method of claim 8 , wherein the step of exposing the absorber material layer to a fluorinating agent that decomposes upon exposure to heat comprises exposing the absorber material layer to a fluorinating agent selected from the group consisting of graphite fluoride, hydrogen fluoride, a fluoro-alkyl halogen, a compound having a hexafluoroacetone moiety, and combinations thereof.
10. The method of claim 1 , wherein the step of fluorinating the absorber material layer comprises subjecting the absorber material layer to an electrochemical fluorination process.
11. The method of claim 10 , wherein the step of subjecting comprises the steps of:
providing a bath comprising a fluorinating agent;
heating the bath to at least 50° C.;
configuring the absorber material layer as an anode and immersing the absorber material layer in the bath; and
passing a current through the bath between the absorber material layer and a cathode.
12. The method of claim 11 , wherein the step of providing a bath comprising a fluorinating agent comprises providing the bath with a fluorinating agent selected from the group consisting of an anhydrous hydrogen fluoride solution, a triethylamine-hydrogen fluoride complex, cesium fluoride-ammonium fluoride-hydrogen fluoride complex (CsF-NH4F-4HF), and combinations thereof.