Process of CVD of Hf and Zr containing oxynitride films
View Patent ↗This invention relates to a chemical vapor deposition process for forming Zr or Hf oxynitride films suitable for use in electronic applications such as gate dielectrics. The process comprises: a. delivering a Zr or Hf containing precursor in gaseous form to a chemical vapor deposition chamber, and, b. simultaneously delivering an oxygen source and a nitrogen source to the chamber separately, such that mixing of these sources with the precursor does not take place prior to delivery to the chamber, and, c. contacting the resultant reaction mixture with a substrate in said chamber, said substrate heated to an elevated temperature to effect deposition of the Zr or Hf oxynitride film, respectively. A silicon containing precursor may be added simultaneously to the chamber for forming Zr or Hf silicon oxynitride films.
1. In a deposition process for forming a metal oxynitride film selected from the group consisting of Zr and Hf oxynitride film, the process which comprises:
A. forming a reaction mixture in a chemical vapor deposition chamber by
(a) delivering a precursor selected from the group consisting of a Zr and Hf containing precursor in gaseous form to said chemical vapor deposition chamber; and,
(b) delivering an oxygen source and a nitrogen source to the chamber separately, such that mixing of said oxygen source and said nitrogen source with the precursor does not take place prior to delivery to the chemical vapor deposition chamber; and,
B. contacting the resultant reaction mixture with a substrate in said chemical vapor deposition chamber, said substrate heated to an elevated temperature to effect deposition of the metal oxynitride film.
2. The process of claim 1 wherein the metal precursor is delivered in gaseous form to said chemical vapor deposition chamber at or below about 10 Torr in pressure.
3. The process of claim 1 wherein the substrate is heated at a temperature from 300 to 700° C.
4. The process of claim 1 wherein the metal precursor is a Zr or Hf amide.
5. The process of claim 4 wherein the Zr or Hf amide is selected from the group consisting of Zr[N(CH 2 CH 3 ) 2 ] 4 , Zr[N(CH 2 CH 3 )(CH 3 )] 4 , Zr[N(CH 3 ) 2 ] 4 , Hf[N(CH 2 CH 3 ) 2 ] 4 , Hf[N(CH 2 CH 3 )(CH 3 )] 4 , or Hf[N(CH 3 ) 2 ] 4 .
6. The process of claim 5 wherein the oxygen and nitrogen source is NO, N 2 O or NO 2 .
7. The process of claim 4 wherein the oxygen source is O 2 , H 2 O, O 3 , or H 2 O 2 .
8. The process of claim 7 wherein the nitrogen source is NH 3 or, N 2 H 4 .
9. The process of claim 5 wherein the oxygen source is O 2 and the nitrogen source is NH 3 .
10. The process of claim 5 wherein a silicon precursor is added to the chemical vapor deposition chamber for forming a Zr or Hf silicon oxynitride film.
11. The process of claim 10 wherein the silicon precursor is a silicon amide.
12. The process of claim 11 wherein the silicon amide is of the form (H) x Si(NR 1 R 2 ) 4-x where R 1 and R 2 are C 1-8 alkyls and x is the integer 0, 1, 2 or 3.
13. The process of claim 12 wherein the silicon amide is selected from the group consisting of Si[N(CH 2 CH 3 ) 2 ] 4 , Si[N(CH 2 CH 3 )(CH 3 )] 4 , Si[N(CH 3 ) 2 ] 4 , HSi[N(CH 2 CH 3 ) 2 ] 3 , HSi[N(CH 2 CH 3 )(CH 3 )] 3 , HSi[N(CH 3 ) 2 ] 3 or H 2 Si[NH(C 4 H 9 )] 2 .
14. In a process for forming a metal oxynitride film selected from the group consisting of Zr oxynitride film and Hf oxynitride film on a substrate, the process which comprises:
a. delivering a precursor selected from the group consisting of Zr and Hf amide precursors in gaseous form to a chemical vapor deposition chamber; and,
b. delivering oxygen and ammonia to the chemical vapor deposition chamber separately from the precursor; and,
c. contacting a substrate with the resultant reaction mixture formed by the delivery of said precursor, said oxygen and said ammonia within said chemical vapor deposition chamber, said substrate heated to a temperature between 300 and 700° C. thereby depositing the metal oxynitride film.
15. The process of claim 14 wherein the Zr or Hf precursor is selected from the group consisting of Zr(N(CH 2 CH 3 ) 2 ] 4 , Zr[N(CH 2 CH 3 )(CH 3 )] 4 , Zr[N(CH 3 ) 2 ] 4 , Hf[N(CH 2 CH 3 ) 2 ] 4 , Hf[N(CH 2 CH 3 )(CH 3 )] 4 , and Hf[N(CH 3 ) 2 ] 4 .
16. In a deposition process for forming a metal oxynitride film selected from the group consisting of Zr silicon oxynitride film and Hf silicon oxynitride film, the process which comprises:
(a) delivering a precursor selected from the group consisting of Zr containing precursor and Hf containing precursor in gaseous form to a chemical vapor deposition chamber;
(b) delivering a Si containing precursor in gaseous form to the chamber either separately or as a mixture with said Zr or Hf containing precursor;
(c) delivering an oxygen source and a nitrogen source to the chamber separately from the Zr, Hf and Si containing precursors; and,
(d) contacting a substrate with the resultant reaction mixture while in said chamber, said substrate heated to a temperature between 300 and 700° C. and the Zr silicon oxynitride film or Hf silicon oxynitride film being deposited on said substrate.
17. The process of claim 16 wherein the Zr or Hf and silicon containing precursor is delivered in gaseous form to a chemical vapor deposition chamber at or below 10 Torr.
18. The process of claim 17 wherein the Zr or Hf and Si containing precursors are Zr amides or Hf amides and silicon amides.
19. The process of claim 18 wherein the amide is selected from the group consisting of N(CH 2 CH 3 ) 2 , N(CH 2 CH 3 )(CH 3 ), N(CH 3 ) 2 , and N(CH 2 CH 3 ) 2 .
20. The process of claim 19 wherein the oxygen source is O 2 and the nitrogen source is NH 3 .