Compounds and compositions for coating glass with silicon oxide
View Patent ↗Silicon compounds useful as coating reactants for the chemical vapor deposition of silicon oxide are disclosed, along with compounds useful as accelerants to increase the deposition rate of silicon oxide. The silicon-containing precursor comprises the structural formula wherein R 1 is an alkyl, alkenyl, alkynyl or aryl radical which may be substituted, and R 2 is a functional group which increases the reactivity of the silicon compound by withdrawing electron density away from the silicon atom, such as hydrogen, halogen, alkenyl, alkynyl, halogenated alkyl and perhalogenated alkyl radicals. The accelerant is a compound selected to take advantage of the partial positive charge on the silicon atom. Such accelerant compounds include Lewis acids and bases; water; ozone; trivalent compounds of nitrogen, boron and phosphorus; tetravalent compounds of sulfur and selenium; pentavalent compounds of phosphorus and a variety of metal compounds. Also disclosed are compositions including an additional metal-containing coating precursor, such as an organotin compound, to deposit another metal oxide along with silicon oxide.
1. An article comprising:
substrate, and
a film over a surface of the substrate, the film comprising one or more metal oxides and an accelerant.
2. The article of claim 1 , wherein said metal oxide is selected from the group of tin oxide, germanium oxide, titanium oxide, aluminum oxide, zirconium oxide, zinc oxide, indium oxide, cadmium oxide, tungsten oxide, vanadium oxide, chromium oxide, molybdenum oxide, nickel oxide, and tantalum oxide.
3. The article of claim 1 , wherein said accelerant is selected from the group consisting of phosphites, borates, water, alkyl phosphine, borane derivatives and ozone.
4. The article of claim 1 , wherein said accelerant is triethylphosphite.
5. The article of claim 1 , further comprising a silicon oxide.
6. The article of claim 1 , wherein said film is amorphous.
7. The article of claim 1 , wherein the substrate is glass.
8. The article of claim 1 , wherein the film has a refractive index which changes continuously.
9. The article of claim 1 , wherein the film comprises a plurality of layers.
10. The article of claim 9 , wherein each layer contains a mixture of tin and silicon oxides.
11. The article of claim 10 , wherein each layer contains a concentration of tin oxide and silicon oxide different from an adjacent layer.
12. The article of claim 1 , wherein the accelerant is present in an amount of up to abut 0.76 mol. percent.
13. The article of claim 1 , wherein the accelerant is present in an amount of from about 0.15 mol. percent to about 0.76 mol. percent.
14. The article of claim 1 , wherein the accelerant is present in an amount of from about 0.36 mol. percent to about 0.76 mol. percent.