Antimony and germanium complexes useful for CVD/ALD of metal thin films
View Patent ↗Antimony, germanium and tellurium precursors useful for CVD/ALD of corresponding metal-containing thin films are described, along with compositions including such precursors, methods of making such precursors, and films and microelectronic device products manufactured using such precursors, as well as corresponding manufacturing methods. The precursors of the invention are useful for forming germanium-antimony-tellurium (GST) films and microelectronic device products, such as phase change memory devices, including such films.
1. A method of fabricating a phase-change non-volatile memory device structure including a germanium alloy, said method comprising forming a germanium alloy on a substrate, wherein the germanium component of said germanium alloy is deposited on said substrate by vapor deposition of germanium from a germanium amidinate precursor, wherein the germanium amidinate precursor includes Ge(II) or Ge(IV), and at least one amidinate ligand of the formula [RNCXNR]— wherein each R is independently selected from H, C1-C6 alkyl, C3-C10 cycloalkyl, C6-C13 aryl, and —Si(R′)3 wherein each R′ is independently selected from C1-C6 alkyl, and X is selected from among H, C1-C6 alkyl, C1-C6 alkoxy, —NR1R2, and —C(R3)3, wherein each of R1, R2 and R3 is independently selected from H, C1-C6 alkyl, C3-C10 cycloalkyl, C6-C13 aryl, and —Si(R4)3 wherein each R4 is independently selected from C1-C6 alkyl, and wherein non-amidinate ligand(s) are selected from alkyl, alkoxy, dialkylamino, hydrido, —Si(R4)3 and halogen groups.
2. The method of claim 1 , wherein the germanium alloy comprises germanium-antimony-tellurium (GST) alloy.
3. The method of claim 1 , wherein the germanium amidinate precursor comprises germanium bis(n-butyl, N,N-diisopropylamidinate),
4. The method of claim 1 , wherein said vapor deposition of germanium is conducted at temperature not exceeding 300° C.
5. The method of claim 2 , wherein the antimony component of said GST alloy is deposited on said substrate by vapor deposition of antimony from an antimony precursor comprising a trialkyl antimony compound or a triamido antimony compound.
6. The method of claim 5 , wherein the antimony precursor comprises a tris-dialkylamido antimony compound.
7. The method of claim 5 , wherein the antimony precursor comprises tris(dimethylamino) antimony.
8. The method of claim 2 , wherein the tellurium component of said GST alloy is deposited on said substrate by vapor deposition of tellurium from a tellurium precursor comprising dialkyl tellurium.
9. The method of claim 8 , wherein the tellurium precursor comprises di-t-butyltellurium.
10. The method of claim 2 , wherein the antimony component of said GST alloy is deposited on said substrate by vapor deposition of antimony from an antimony precursor comprising tris(dimethylamino)antimony, and the tellurium component of said GST alloy is deposited on said substrate by vapor deposition of tellurium from a tellurium precursor comprising di-t-butyltellurium.
11. The method of claim 10 , comprising delivery of said precursors for vapor deposition, in which each of the precursors is delivered separately or in precursor mixture.
12. The method of claim 11 , wherein the tellurium precursor is delivered separately for vapor deposition.
13. The method of claim 1 , wherein the phase-change non-volatile memory device structure includes electrode and dielectric material components.
14. The method of claim 1 , wherein the phase-change non-volatile memory device structure includes an insulating material containing a via within which the GST material is deposited.
15. The method of claim 14 , wherein the insulating material comprises material selected from the group consisting of silicon oxide, silicon nitride, and low k dielectric material.
16. The method of claim 2 , further comprising doping said GST alloy with at least one of silicon and nitrogen.
17. The method of claim 2 , wherein the GST alloy is formed using a hydrogen or ammonia co-reactant.
18. The method of claim 2 , wherein the GST alloy is formed by chemical vapor deposition.
19. The method of claim 2 , wherein the GST alloy is formed by atomic layer deposition.
20. The method of claim 1 , further comprising precursor liquid delivery.
21. The method of claim 20 , wherein said liquid delivery comprises a liquid delivery medium including at least one solvent species selected from the group consisting of alkane solvents, ethers, aryl solvents, amines, imines, guanidines, amidines and hydrazines.
22. The method of claim 2 , further comprising doping the GST alloy to reduce its reset current.