Low-impurity organosilicon product as precursor for CVD
View Patent ↗The present invention provides an organosilicon composition comprising diethoxymethylsilane, a concentration of dissolved residual chloride, and a concentration of dissolved residual chloride scavenger that does not yield unwanted chloride salt precipitate when combined with another composition comprising diethoxymethylsilane.
1. A method for preventing solids formation in an organosilicon material employed in a chemical vapor deposition process, the method comprising the steps of:
providing an organosilicon composition comprising:
at least one organosilicon selected from the group consisting of: an alkoxysilane and a carboxysilane;
a first concentration of dissolved residual chloride; and
a first concentration of dissolved residual chloride scavenger,
wherein the organosilicon composition has a first K sp (os) defined as the product of [upper limit of the first concentration of the dissolved residual chloride in parts per million by weight] X , wherein X is 1, 2, 3, or 4 and [upper limit of the first concentration of the dissolved residual chloride scavenger in parts per million by weight] wherein the upper limits are limits beyond which a solid chloride precipitate will appear; and
wherein the first concentration of dissolved residual chloride is less than the square root of the first Ksp(os) when X is 1, less than cubed root of the first Ksp(os) when X is 2, less than the fourth root of the first Ksp(os) when X is 3, or less than the fifth root of the first Ksp(os) when X is 4, and the first concentration of the dissolved residual chloride scavenger is less than the square root of the first Ksp(os) when X is 1, less than cubed root of the first Ksp(os) when X is 2, less than the fourth root of the first Ksp(os) when X is 3, or less than the fifth root of the first Ksp(os) when X is 4; and
providing a second organosilicon comprising at least one organosilicon selected from the group consisting of: an alkoxysilane and carboxysilane, a second concentration of dissolved residual chloride, and a second concentration of dissolved residual chloride scavenger,
wherein the second organosilicon has a second Ksp(os) defined as the product of [the second concentration of the dissolved residual chloride in parts per million by weight]X, wherein X is 1, 2, 3, or 4, and [the second concentration of the dissolved residual chloride scavenger in parts per million by weight] and
wherein each of the second concentration of dissolved residual chloride and the second concentration of the dissolved residual chloride scavenger is less than the square root of the first Ksp(os) when X is 1, less than cubed root of the first Ksp(os) when X is 2, less than the fourth root of the first Ksp(os) when X is 3, or less than the fifth root of the first Ksp(os) when X is 4.
2. The method of claim 1 wherein each of the first and second organosilicon comprises at least one carboxysilane.
3. The method of claim 1 wherein each of the first and second organosilicon comprises at least one alkoxysilane.
4. The method of claim 3 wherein the alkoxysilane is diethoxymethylsilane.
5. The method of claim 4 wherein each of the first concentration of dissolved residual chloride and the first concentration of the dissolved residual chloride scavenger is less than 90% of the square root of the first Ksp(os) when X is 1, less than 90% of the cubed root of the first Ksp(os) when X is 2, less than 90% of the fourth root of the first Ksp(os) when X is 3, or less than 90% of the fifth root of the first Ksp(os) when X is 4.
6. The method of claim 5 wherein each of the second concentration of dissolved residual chloride and the second concentration of the dissolved residual chloride scavenger is less than 90% of the square root of the first Ksp(os) when X is 1, less than 90% of the cubed root of the first Ksp(os) when X is 2, less than 90% of the fourth root of the first Ksp(os) when X is 3, or less than 90% of the fifth root of the first Ksp(os) when X is 4.
7. The method of claim 4 wherein each of the first concentration of dissolved residual chloride and the first concentration of the dissolved residual chloride scavenger is less than 70% of the square root of the first Ksp(os) when X is 1, less than 70% of the cubed root of the first Ksp(os) when X is 2, less than 70% of the fourth root of the first Ksp(os) when X is 3, or less than 70% of the fifth root of the first Ksp(os) when X is 4.
8. The method of claim 7 wherein each of the second concentration of dissolved residual chloride and the second concentration of the dissolved residual chloride scavenger is less than 70% of the square root of the first Ksp(os) when X is 1, less than 70% of the cubed root of the first Ksp(os) when X is 2, less than 70% of the fourth root of the first Ksp(os) when X is 3, or less than 70% of the fifth root of the first Ksp(os) when X is 4.
9. The method of claim 4 wherein each of the first concentration of dissolved residual chloride and the first concentration of the dissolved residual chloride scavenger is less than 50% of the square root of the first Ksp(os) when X is 1, less than 50% of the cubed root of the first Ksp(os) when X is 2, less than 50% of the fourth root of the first Ksp(os) when X is 3, or less than 50% of the fifth root of the first Ksp(os) when X is 4.
10. The method of claim 9 wherein each of the second concentration of dissolved residual chloride and the second concentration of the dissolved residual chloride scavenger is less than 50% of the square root of the first Ksp(os) when X is 1, less than 50% of the cubed root of the first Ksp(os) when X is 2, less than 50% of the fourth root of the first Ksp(os) when X is 3, or less than 50% of the fifth root of the first Ksp(os) when X is 4.
11. The method of claim 4 wherein each of the first concentration of dissolved residual chloride and the first concentration of the dissolved residual chloride scavenger is less than 30% of the square root of the first Ksp(os) when X is 1, less than 30% of the cubed root of the first Ksp(os) when X is 2, less than 30% of the fourth root of the first Ksp(os) when X is 3, or less than 30% of the fifth root of the first Ksp(os) when X is 4.
12. The method of claim 11 wherein each of the second concentration of dissolved residual chloride and the second concentration of the dissolved residual chloride scavenger is less than 30% of the square root of the first Ksp(os) when X is 1, less than 30% of the cubed root of the first Ksp(os) when X is 2, less than 30% of the fourth root of the first Ksp(os) when X is 3, or less than 30% of the fifth root of the first Ksp(os) when X is 4.
13. The method of claim 4 wherein each of the first concentration of dissolved residual chloride and the first concentration of the dissolved residual chloride scavenger is less than 10% of the square root of the first Ksp(os) when X is 1, less than 10% of the cubed root of the first Ksp(os) when X is 2, less than 10% of the fourth root of the first Ksp(os) when X is 3, or less than 10% of the fifth root of the first Ksp(os) when X is 4.
14. The method of claim 13 wherein each of the second concentration of dissolved residual chloride and the second concentration of the dissolved residual chloride scavenger is less than 10% of the square root of the first Ksp(os) when X is 1, less than 10% of the cubed root of the first Ksp(os) when X is 2, less than 10% of the fourth root of the first Ksp(os) when X is 3, or less than 10% of the fifth root of the first Ksp(os) when X is 4.