Low dielectric constant fluorine and carbon-containing silicon oxide dielectric material characterized by improved resistance to oxidation
View Patent ↗The invention provides a process for forming a low k fluorine and carbon-containing silicon oxide dielectric material by reacting with an oxidizing agent one or more silanes containing one or more organofluoro silanes having the formula SiR 1 R 2 R 3 R 4 , where: (a) R 1 is selected from H, a 3 to 10 carbon alkyl, and an alkoxy; (b) R 2 contains at least one C atom bonded to at least one F atom, and no aliphatic C—H bonds; and (c) R 3 and R 4 are selected from H, alkyl, alkoxy, a moiety containing at least one C atom bonded to at least one F atom, and ((L)Si(R 5 )(R 6 )) n (R 7 ); where n ranges from 1 to 10; L is O or CFR 8 ; each n R 5 and R 6 is selected from H, alkyl, alkoxy, and a moiety containing at least one C atom bonded to at least one F atom; R 7 is selected from H, alkyl, alkoxy, and a moiety containing at least one C atom bonded to at least one F atom; and each R 8 is selected from H, alkyl, alkoxy, and a moiety containing at least one C atom bonded to at least one F atom. Also provided is a low dielectric constant fluorine and carbon-doped silicon oxide dielectric material for use in an integrated circuit structure which contains: silicon atoms bonded to oxygen atoms; silicon atoms bonded to carbon atoms; and carbon atoms bonded to fluorine atoms; where the dielectric material also has a characteristic selected from: (a) the presence of at least one C—C bond; (b) the presence of at least one carbon atom bonded to from 1 to 2 fluorine atoms; and (c) the presence of at least one silicon atom bonded to from 0 to 2 oxygen atoms.
1. A low dielectric constant fluorine and carbon-doped silicon oxide dielectric material for use in an integrated circuit structure comprising the reaction product of an oxidizing agent and one or more silanes comprising one or more organofluoro silanes having the formula SiR 1 R 2 R 3 R 4 , wherein:
(a) R 1 is selected from the group consisting of H, a 3 to 5 carbon organo moiety, and an oxyorgano moiety;
(b) R 2 is an organofluoro moiety; and
(c) R 3 and R 4 are independently selected from the group consisting of the same or different leaving group, the same or different organofluoro moiety, and the same or different organofluoro moiety, and the same or different ((L)Si(R 5 )(R 6 )) n (R 7 ); wherein n ranges from 1 to 5; L is O or (C(R 8 ) 2 )m; m ranges from 1 to 4; each of the n R 5 's and n R 6 's is independently selected from the group consisting of the same or different leaving group and the same or different organofluoro moiety; R 7 is selected from the group consisting of a leaving group and an organofluoro moiety; and each of the 2n*m or fewer R 8 's is selected from the group consisting of F and the same or different organofluoro moiety;
and further characterized by:
(d) each silicon atom is bonded to at least 1 oxygen atom;
(e) silicon atoms bonded to carbon atoms;
(f) at least 1 carbon atom bonded to 1 to 2 fluorine atoms; and;
(g) the presence of at least 1 C—C bond.
2. The low dielectric constant fluorine and carbon-doped silicon oxide dielectric material of claim 1 wherein said oxidizing agent comprises hydrogen peroxide.
3. The low dielectric constant fluorine and carbon-doped silicon oxide dielectric material of claim 1 wherein said R 1 comprises hydrogen.
4. The low dielectric constant fluorine and carbon-doped silicon oxide dielectric material of claim 1 wherein said R 2 comprises an organofluoro moiety containing CF 3 .
5. The low dielectric constant fluorine and carbon-doped silicon oxide dielectric material of claim 1 wherein said R 2 consists essentially of C and F atoms.
6. The low dielectric constant fluorine and carbon-doped silicon oxide dielectric material of claim 1 wherein said R 2 consists essentially of C and F atoms alone.
7. The low dielectric constant fluorine and carbon-doped silicon oxide dielectric material of claim 1 wherein said R 2 consists essentially of C and F atoms and R 3 consists essentially of an alkyl.
8. The low dielectric constant fluorine and carbon-doped silicon oxide dielectric material of claim 1 wherein said R 3 contains CH 3 moieties.
9. The low dielectric constant fluorine and carbon-doped silicon oxide dielectric material of claim 1 wherein said R 4 comprises a leaving group.
10. The low dielectric constant fluorine and carbon-doped silicon oxide dielectric material of claim 1 wherein said R 4 comprises hydrogen.
11. A low dielectric constant fluorine and carbon-doped silicon oxide dielectric material for use in an integrated circuit structure and further characterized by:
(a) each silicon atom is bonded to at least 1 oxygen atom;
(b) silicon atoms bonded to carbon atoms;
(c) at least 1 carbon atom bonded to 1 to 2 fluorine atoms; and
(d) the presence of at least 1 C—C bond.
12. The low dielectric constant fluorine and carbon-doped silicon oxide dielectric material of claim 11 wherein at least one of the carbon atoms participating in said C—C bond is also bonded to at least one fluorine atom.