Photoresist development with halide chemistries
Development of resists are useful, for example, to form a patterning mask in the context of high-resolution patterning. Development can be accomplished using a halide-containing chemistry such as a hydrogen halide. A metal-containing resist film may be deposited on a semiconductor substrate using a dry or wet deposition technique. The resist film may be an EUV-sensitive organo-metal oxide or organo-metal-containing thin film resist. After exposure, the photopatterned metal-containing resist is developed using wet or dry development.
1. A method of processing a semiconductor substrate, comprising:
providing in a process chamber a photopatterned organo-metal-oxide EUV resist comprising an unexposed organo-metal-oxide-containing portion and an EUV-exposed metal-oxide-containing portion on a substrate layer of a semiconductor substrate; and
dry developing the photopatterned organo-metal-oxide EUV resist by selectively removing a portion of the resist by exposure to a dry development chemistry comprising a hydrogen halide to form a resist mask, wherein the hydrogen halide selectively removes the unexposed organo-metal-oxide-containing portion relative to the EUV-exposed metal-oxide-containing portion to form the resist mask.
2. The method of claim 1 , wherein the hydrogen halide selectively breaks metal-oxide bonds in organo-metal-oxide networks in the unexposed organo-metal-oxide-containing portion to form one or more volatile byproducts, while leaving metal-oxide bonds intact in metal-oxide networks in the EUV-exposed metal-oxide-containing portion to form the resist mask.
3. The method of claim 1 , further comprising:
removing the unexposed organo-metal-oxide-containing portion and the EUV-exposed metal-oxide-containing portion of the photopatterned organo-metal-oxide EUV resist without removing the substrate layer.
4. The method of claim 1 , wherein the dry development chemistry comprises hydrogen fluoride (HF), hydrogen chloride (HCI), hydrogen bromide (HBr), or hydrogen iodide (HI).
5. The method of claim 1 , wherein the dry developing of the photopatterned organo-metal-oxide EUV resist comprises applying a remote plasma including radicals of the hydrogen halide to the resist.
6. The method of claim 1 , wherein the dry developing of the photopatterned organo-metal-oxide EUV resist comprises exposure to at least the hydrogen halide in a plasma-free thermal process.
7. The method of claim 1 , wherein the dry developing of the photopatterned organo-metal-oxide EUV resist occurs at a temperature between about−60° C. and about 120° C., at a chamber pressure between about 0.1 mTorr and about 760 Torr, at a gas flow rate of the hydrogen halide between about 100 sccm and about 2000 sccm, an etch selectivity of the resist mask being tunable based at least in part on the temperature, the chamber pressure, the gas flow rate, or combinations thereof.
8. The method of claim 7 , wherein a profile of the resist mask is controllable based at least in part on the temperature, the chamber pressure, the gas flow rate, or combinations thereof.
9. The method of claim 1 , further comprising:
exposing, after the developing of the photopatterned organo-metal-oxide EUV resist, the photopatterned organo-metal-oxide EUV resist to an inert gas plasma.
10. A method of processing a semiconductor substrate, the method comprising:
providing in a process chamber a dry-deposited or wet-deposited photopatterned organo-metal-oxide-containing EUV resist comprising an unexposed organo-metal-oxide-containing portion and an EUV-exposed metal-oxide-containing portion on a substrate layer of a semiconductor substrate; and
dry developing the photopatterned organo-metal-oxide-containing EUV resist by selectively removing a portion of the EUV resist by exposure to a dry development chemistry comprising HCl and/or HBr to form a resist mask, wherein the HCl and/or HBr selectively removes the unexposed organo-metal-oxide-containing portion relative to the EUV-exposed metal-oxide-containing portion to form the resist mask.
11. The method of claim 10 , wherein the dry developing occurs in a plasma-free thermal process, wherein exposure to the dry development chemistry occurs at a temperature between about −60° C. and about 120° C.
12. The method of claim 10 , wherein the photopatterned organo-metal-oxide-containing EUV resist includes an organotin oxide.