Method of making thermally tempered coated article with transparent conductive oxide (TCO) coating in color compression configuration, and product made using same
View Patent ↗Example embodiments of this invention relate to a method of making a thermally tempered coated article including a transparent conductive oxide (TCO) film in a color compression configuration supported by a tempered glass substrate. A coated article, that is thermally tempered and made by such a process, is also provided. Coated articles according to certain example non-limiting embodiments of this invention may be used in applications such as solar cells, oven doors, electrostatic discharge glass, solar control windows, defrosting windows, or other types of windows in certain example instances.
1. A method of making a thermally tempered coated article including a transparent conductive film on a tempered glass substrate, the method comprising:
providing a glass substrate;
sputter-depositing a high index layer having a high refractive index on the glass substrate, and then sputter-depositing a low index layer having a low refractive index on the glass substrate over at least the high index layer;
after the high index layer and the low index layer have been sputter-deposited on the glass substrate, sputter-depositing an amorphous film on the glass substrate over each of the high index layer and the low index layer;
thermally tempering the glass substrate with the amorphous film, the low index layer, and the high index layer thereon; and
wherein heat used in said tempering causes at least the amorphous film to transform into a crystalline film, and wherein the crystalline film is transparent to visible light and electrically conductive following said tempering.
2. The method of claim 1 , wherein the amorphous film comprises at least an oxide of Sn and Sb, and wherein following the tempering the crystalline film comprises an oxide of Sn and Sb.
3. The method of claim 1 , wherein the crystalline film comprises an oxide of Sn and Sb.
4. The method of claim 1 , wherein the low index layer has a refractive index of from about 1.3 to 1.6, and the high index layer has a refractive index of from about 1.7 to 2.4.
5. The method of claim 1 , wherein the low index layer has a refractive index of from about 1.35 to 1.45, and the high index layer has a refractive index of from about 1.8 to 2.2.
6. The method of claim 1 , wherein each of the low index layer and the high index layer have a thickness of from about 100 to 500 angstroms.
7. The method of claim 1 , wherein the low index layer comprises an oxide of silicon.
8. The method of claim 1 , wherein the high index layer comprises at least one of titanium oxide, tin oxide, and zinc oxide.
9. The method of claim 1 , wherein following the tempering the low index layer is a dielectric layer, and the high index layer is a dielectric layer or a transparent conductive layer.
10. The method of claim 1 , wherein following the tempering the low index layer is a dielectric layer, and the high index layer is a transparent conductive layer.
11. The method of claim 1 , wherein after the tempering the low index layer is located between and directly contacting each of the high index layer and the crystalline film.
12. The method of claim 1 , wherein the heat used in said tempering causes sheet resistance of the film to decrease by at least about 20 ohms/square.
13. The method of claim 1 , wherein the heat used in said tempering causes sheet resistance of the film to decrease by at least about 50 ohms/square.
14. The method of claim 1 , wherein the crystalline film has a sheet resistance of no greater than about 200 ohms/square.
15. The method of claim 1 , wherein the crystalline film has a sheet resistance of no greater than about 100 ohms/square.
16. The method of claim 1 wherein the crystalline film comprises an oxide of Sn, and wherein Sb content of the crystalline film is from about 0.001 to 30%.
17. The method of claim 1 wherein the crystalline film comprises an oxide of Sn, and wherein Sb content of the crystalline film is from about 1 to 15%.
18. The method of claim 1 , wherein the crystalline film comprises SnO x :Sb and is at least about 70% transparent to visible light.
19. The method of claim 1 , wherein following tempering the coated article has a visible transmission of at least about 70%.
20. A method of making a thermally tempered coated article including a transparent conductive film on a tempered glass substrate, the method comprising:
providing a glass substrate;
forming a high index layer having a high refractive index on the glass substrate, and a low index layer having a low refractive index on the glass substrate over at least the high index layer;
after the high index layer and the low index layer have been formed, forming an amorphous film comprising a metal oxide on the glass substrate over each of the high index layer and the low index layer;
thermally tempering the glass substrate with the amorphous film, the low index layer, and the high index layer thereon; and
wherein heat used in said tempering causes at least the amorphous film to transform into a film which is substantially transparent and electrically conductive.
21. The method of claim 20 , wherein the crystalline film comprises an oxide of Sn and Sb.
22. The method of claim 20 , wherein the low index layer has a refractive index of from about 1.3 to 1.6, and the high index layer has a refractive index of from about 1.7 to 2.4.