Atomic layer deposition of antimony oxide films
Antimony oxide thin films are deposited by atomic layer deposition using an antimony reactant and an oxygen source. Antimony reactants may include antimony halides, such as SbCl 3 , antimony alkylamines, and antimony alkoxides, such as Sb(OEt) 3 . The oxygen source may be, for example, ozone. In some embodiments the antimony oxide thin films are deposited in a batch reactor. The antimony oxide thin films may serve, for example, as etch stop layers or sacrificial layers.
1. A vapor deposition process for depositing an antimony oxide thin film, comprising alternately and sequentially contacting a substrate in a reaction chamber with a vapor phase antimony source and a vapor phase oxygen source, wherein the antimony source has an oxidation state of +III or +V.
2. The process of claim 1 , wherein the process is an atomic layer deposition (ALD) process.
3. The process of claim 2 , wherein the process is a thermal ALD process.
4. The method of claim 1 , wherein the oxygen source is selected from the group consisting of water, oxygen, hydrogen peroxide, aqueous solution of hydrogen peroxide, ozone, atomic oxygen, oxides of nitrogen, peracids (—O—O—H), alcohols, oxygen-containing radicals and mixtures thereof.
5. The method of claim 4 , wherein the oxygen source comprises ozone.
6. The method of claim 1 , further comprising exposing the substrate to water.
7. The method of claim 6 , wherein the substrate is exposed to water subsequent to contacting the substrate with the antimony source and prior to contacting the substrate with the oxygen source.
8. The process of claim 1 , wherein the antimony source has the formula SbX z A 3-z , wherein X is a halide, z is from 1 to 3, and A is a ligand comprising alkylamine, a halide different from X, or an amine, silyl, alkoxide or alkyl group.
9. The process of claim 8 , wherein the antimony source comprises SbCl 3 , SbBr 3 , SbF 3 , or SbI 3 .
10. The process of claim 9 , wherein the antimony source is SbCl 3 .
11. An atomic layer deposition (ALD) process for depositing an antimony oxide thin film on a substrate in a reaction space, the process comprising:
contacting the substrate with a vapor phase antimony precursor comprising an antimony halide such that an antimony compound adsorbs to the substrate, wherein the antimony halide has an oxidation state of +III or +V; and
contacting the substrate with an oxygen source to thereby convert the adsorbed antimony compound into antimony oxide.
12. The process of claim 11 , wherein the antimony precursor has the formula SbX z A 3-z , wherein X is a halide, z is from 1 to 3, and A is a ligand comprising alkylamine, a halide different from X, or an amine, silyl, alkoxide or alkyl group.
13. The method of claim 11 , wherein the oxygen source comprises ozone.
14. The method of claim 11 , wherein the oxygen source is not water.
15. The method of claim 11 , wherein exposing the substrate to the oxygen source comprises exposing the substrate to an oxygen-containing gas pulse, wherein the oxygen-containing gas pulse comprises the oxygen source and an inactive gas.
16. The method of claim 15 , wherein the oxygen source comprises at least one of oxygen and ozone, and wherein the inactive gas comprises nitrogen or argon.
17. The process of claim 11 , wherein the contacting steps comprise a deposition cycle, the process comprising multiple deposition cycles.
18. The process of claim 17 , further comprising repeating the deposition cycle until an antimony oxide film of a desired thickness has been formed.
19. The process of claim 17 , the deposition cycle further comprising removing excess antimony precursor and reaction byproducts, if any, from the substrate subsequent to contacting the substrate with the vapor phase antimony precursor and prior to a subsequent contacting step.
20. The process of claim 17 , the deposition cycle further comprising removing excess oxygen source and reaction byproducts, if any, from the substrate subsequent to contacting the substrate with the oxygen source and prior to a subsequent contacting step.