Coated article with IR reflecting layer(s) and method of making same
A coated article is provided with at least one infrared (IR) reflecting layer. The IR reflecting layer may be of silver or the like. In certain example embodiments, a titanium oxide layer is provided over the IR reflecting layer, and it has been found that this surprisingly results in an IR reflecting layer with a lower specific resistivity (SR) thereby permitting thermal properties of the coated article to be improved.
1. A method of making a coated article, the method comprising:
providing a glass substrate;
forming a dielectric layer on the substrate;
forming an IR reflecting layer comprising silver on the substrate over at least the dielectric layer;
depositing a layer comprising titanium oxide over and directly contacting the IR reflecting layer comprising silver in a manner so that the layer comprising titanium oxide as deposited is more oxided at a location therein further from the IR reflecting layer than at a location closer to the IR reflecting layer.
2. The method of claim 1 , wherein said depositing comprises sputtering.
3. The method of claim 1 , wherein said forming the IR reflecting layer comprises sputtering the IR reflecting layer.
4. The method of claim 1 , further comprising depositing a layer comprising zinc oxide located between the dielectric layer and the IR reflecting layer, the layer comprising zinc oxide directly contacting the IR reflecting layer.
5. The method of claim 4 , wherein the dielectric layer comprises an oxide of titanium.
6. The method of claim 4 , wherein the dielectric layer comprises tin oxide.
7. The method of claim 1 , wherein the IR reflecting layer comprising silver has a specific resistivity (SR) of no greater than 5.0 micro-ohms·cm.
8. The method of claim 1 , wherein the IR reflecting layer comprising silver has a specific resistivity (SR) of no greater than 4.8 micro-ohms·cm.
9. The method of claim 1 , wherein the IR reflecting layer comprising silver has a specific resistivity (SR) of no greater than 4.6 micro-ohms·cm.
10. The method of claim 1 , wherein the coated article has a visible transmission of at least 70%.
11. The method of claim 1 , wherein the coated article has a glass side visible reflectance (R g Y) of from 1-10%, measured monolithically.
12. The method of claim 1 , wherein the coated article has a film side visible reflectance (R f Y) of from 1-7%, measured monolithically.
13. The method of claim 1 , wherein the coated article has a glass side reflective a* value from −5.0 to +4.0, and a glass side reflective b* value from −14.0 to +10.0.
14. The method of claim 1 , wherein the coated article has a glass side reflective a* value from −1.5 to +3.0, and a glass side reflective b* value from −10.0 to 0.
15. The method of claim 1 , further comprising depositing a layer comprising silicon nitride located over and contacting a layer comprising tin oxide, wherein said layer comprising silicon nitride is an overcoat and thus an uppermost layer of the coating.
16. The method of claim 1 , wherein the coating includes only one IR reflecting layer comprising silver.