Methods of depositing a metal oxide layer or film using a rare earth metal precursor
Methods of depositing a single or mixed metal oxide layer or film are described herein. The methods use a rare earth metal precursor are described herein. The rare earth metal precursors have a general formula M[OCR 1 (R 2 )(CH 2 )X] 3 , wherein M is a rare earth metal, R 1 is H or an alkyl group, R 2 is an optionally substituted alkyl group and X is selected from OR and NR, wherein R is an alkyl group or a substituted alkyl group.
1. A method of depositing a single or mixed metal oxide layer or film by liquid injection MOCVD, the method comprising using a rare earth metal precursor corresponding in structure to the formula
M[OCR 1 (R 2 )(CH 2 )X] 3
wherein M is a rare earth metal, R 1 is H or an alkyl group, R 2 is an alkyl group optionally substituted with an alkoxy group, X is selected from the group consisting of OR and NR 2 , wherein R is an alkyl group optionally substituted with an alkoxy group, wherein the rare earth metal precursor is dissolved in an appropriate inert organic solvent containing an additive different from the solvent and selected from the group consisting of one or more polydentate ether and donor functionalized alcohol.
2. The method as claimed in claim 1 , wherein the inert organic solvent comprises a solvent selected from the group consisting of an aliphatic hydrocarbon, an aromatic hydrocarbon, an aliphatic ether, and a cyclic ether.
3. The method as claimed in claim 2 , wherein the inert organic solvent comprises an aliphatic hydrocarbon solvent selected from the group consisting of hexane, heptane and nonane.
4. The method as claimed in claim 2 , wherein the aromatic hydrocarbon solvent is toluene.
5. The method as claimed in claim 1 , wherein the polydentate ether is selected from the group consisting of CH 3 O(CH 2 CH 2 O) 2 CH 3 , CH 3 O(CH 2 CH 2 O) 3 CH 3 , and CH 3 O(CH 2 CH 2 O) 4 CH 3 .
6. The method as claimed in claim 1 , wherein the additive is 1-methoxy-2-methyl-2-propanol.
7. The method as claimed in claim 1 , wherein the amount of additive in the solvent is at least 3 mol. equiv.: 1 mol. equiv. of precursor.
8. The method as claimed in claim 7 , wherein the amount of additive in the solvent is about 3 mol. equiv.
9. The method as claimed in claim 1 , wherein M is praseodymium or lanthanum.
10. The method as claimed in claim 1 , wherein [OCR 1 (R 2 )(CH 2 )X] is [OCMe 2 CH 2 OMe].
11. The method as claimed in claim 1 , wherein [OCR 1 (R 2 )(CH 2 )X] is selected from the group consisting of
OCH(Me)CH 2 OMe, OCEt 2 CH 2 OMe, OCH(Et)CH 2 OMe,
OC(Pr i ) 2 CH 2 OMe, OCH(Pr i )CH 2 OMe, OC(Bu t ) 2 CH 2 OMe, OCH(Bu t )CH 2 OMe,
OCH(Bu t )CH 2 OEt, OC(Bu t ) 2 CH 2 OEt, OC(Pr i ) 2 CH 2 OEt and OCH(Bu t )CH 2 NEt 2 .
12. The method as claimed in claim 1 , wherein the precursor is Pr(OCMe 2 CH 2 OMe) 3 .
13. The method as claimed in claim 1 , wherein the precursor is La(OCMe 2 CH 2 OME) 3 .
14. The method as claimed in claim 1 , wherein the precursor is Gd(OCMe 2 CH 2 OMe) 3 .
15. The method as claimed in claim 1 , wherein the precursor is Nd(OCMe 2 CH 2 OMe) 3 .
16. The method as claimed in claim 1 , wherein M is selected from the group consisting of La, Ce, Gd, Nd, Pm, Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Group IIIB elements.
17. The method as claimed in claim 1 , carried out with an appropriate co-precursor, for the MOCVD of a mixed metal oxide layer or film.
18. A method of depositing a single or mixed metal oxide layer or film by atomic layer deposition, the method comprising using a rare earth metal precursor corresponding in structure to
M[OCR 1 (R 2 )CH 2 X] 3 ,
wherein M is a rare earth metal, R 1 is H or an alkyl group, R 2 is an alkyl group optionally substituted with an alkoxy group, X is selected from the group consisting of OR and NR 2 , wherein R is an alkyl group
optionally substituted with an alkoxy group.
19. The method as claimed in claim 18 , wherein M is praseodymium or lanthanum.
20. A method of depositing a single or mixed metal oxide layer or film by a non-vapor phase deposition technique, the method comprising using a rare earth metal precursor corresponding in structure to
M[OCR 1 (R 2 )CH 2 X] 3 ,
wherein M is a rare earth metal, R 1 is H or an alkyl group, R 2 is an alkyl group optionally substituted with an alkoxy group, X is selected from the group consisting of OR and NR 2 , wherein R is an alkyl group optionally substituted with an alkoxy group.
21. The method as claimed in claim 20 , wherein the non-vapor technique is selected from the group consisting of sol-gel deposition and metal-organic decomposition.