Low-E matchable coated articles having absorber film and corresponding methods
A low-E coating has good color stability (a low ΔE* value) upon heat treatment (HT). Thermal stability may be improved by the provision of an as-deposited crystalline or substantially crystalline layer of or including zinc oxide, doped with at least one dopant (e.g., Sn), immediately under an infrared (IR) reflecting layer of or including silver; and/or by the provision of at least one dielectric layer of or including an oxide of zirconium. These have the effect of significantly improving the coating's thermal stability (i.e., lowering the ΔE* value). An absorber film may be designed to adjust visible transmission and provide desirable coloration, while maintaining durability and/or thermal stability. The dielectric layer (e.g., of or including an oxide of Zr) may be sputter-deposited so as to have a monoclinic phase in order to improve thermal stability.
1. A coated article including a coating on a glass substrate, wherein the coating comprises:
a first crystalline or substantially crystalline layer comprising zinc oxide doped with from about 1-30% Sn (wt. %), provided on the glass substrate;
a first infrared (IR) reflecting layer comprising silver located on the glass substrate and directly over and contacting the first crystalline or substantially crystalline layer comprising zinc oxide doped with from about 1-30% Sn;
wherein no silicon nitride based layer is located directly under and contacting the first crystalline or substantially crystalline layer comprising zinc oxide doped with from about 1-30% Sn;
at least one dielectric layer having monoclinic phase and comprising an oxide of zirconium;
wherein the at least one dielectric layer having monoclinic phase and comprising the oxide of zirconium is located: (1) between at least the glass substrate and the first crystalline or substantially crystalline layer comprising zinc oxide doped with from about 1-30% Sn (wt. %), and/or (2) between at least the first IR reflecting layer comprising silver and a second IR reflecting layer comprising silver of the coating;
an absorber film including a layer comprising silver, wherein a ratio of a physical thickness of the first IR reflecting layer comprising silver to a physical thickness of the layer comprising silver of the absorber film is at least 5:1, and wherein the layer comprising silver of the absorber film does not directly contact the first IR reflecting layer; and
wherein the coated article is configured to have, measured monolithically, all of: (i) a transmissive ΔE* value of no greater than 3.0 upon a reference heat treatment for 12 minutes at a temperature of about 650 degrees C., and (ii) a glass side reflective ΔE* value of no greater than 3.0 upon the reference heat treatment for 12 minutes at a temperature of about 650 degrees C.
2. The coated article of claim 1 , wherein the absorber film further comprises a layer comprising an oxide of Ni and/or Cr located over and directly contacting the layer comprising silver of the absorber film.
3. The coated article of claim 1 , wherein the absorber film is located over the first IR reflecting layer, so that the first IR reflecting layer is located between at least the absorber film and the glass substrate.
4. The coated article of claim 1 , wherein the ratio of the physical thickness of the first IR reflecting layer comprising silver to the physical thickness of the layer comprising silver of the absorber film is at least 8:1.
5. The coated article of claim 1 , wherein the ratio of the physical thickness of the first IR reflecting layer comprising silver to the physical thickness of the layer comprising silver of the absorber film is at least 10:1.
6. The coated article of claim 1 , wherein the ratio of the physical thickness of the first IR reflecting layer comprising silver to the physical thickness of the layer comprising silver of the absorber film is at least 15:1.
7. The coated article of claim 1 , wherein the layer comprising silver of the absorber film is less than 60 Å thick.
8. The coated article of claim 1 , wherein the layer comprising silver of the absorber film is less than 30 Å thick.
9. The coated article of claim 1 , wherein the layer comprising silver of the absorber film is less than 15 Å thick.
10. The coated article of claim 1 , wherein the coated article is configured to have, measured monolithically, all three of: (i) a transmissive ΔE* value of no greater than 3.0 upon a reference heat treatment for 12 minutes at a temperature of about 650 degrees C., (ii) a glass side reflective ΔE* value of no greater than 3.0 upon the reference heat treatment for 12 minutes at a temperature of about 650 degrees C., and (iii) a film side reflective ΔE* value of no greater than 3.5 upon the reference heat treatment for 12 minutes at a temperature of about 650 degrees C.
11. The coated article of claim 1 , wherein the at least one dielectric layer comprising monoclinic phase is located at least between at least the glass substrate and the first crystalline or substantially crystalline layer comprising zinc oxide doped with from about 1-30% Sn (wt. %).
12. The coated article of claim 1 , wherein the at least one dielectric layer comprising monoclinic phase is located at least between at least the first IR reflecting layer comprising silver and the second IR reflecting layer comprising silver of the coating.
13. The coated article of claim 1 , wherein the first crystalline or substantially crystalline layer comprising zinc oxide is doped with from about 1-20% Sn (wt. %).
14. The coated article of claim 1 , wherein the first crystalline or substantially crystalline layer comprising zinc oxide is doped with from about 5-15% Sn (wt. %).
15. The coated article of claim 1 , wherein the first crystalline or substantially crystalline layer comprising zinc oxide doped with Sn is crystalline or substantially crystalline as sputter-deposited.
16. The coated article of claim 1 , wherein the coated article is configured to have, measured monolithically, all of: (i) a transmissive ΔE* value of no greater than 2.5 upon a reference heat treatment for 12 minutes at a temperature of about 650 degrees C., (ii) a glass side reflective ΔE* value of no greater than 2.5 upon the reference heat treatment for 12 minutes at a temperature of about 650 degrees C., and (iii) a film side reflective ΔE* value of no greater than 3.0 upon the reference heat treatment for 12 minutes at a temperature of about 650 degrees C.
17. The coated article of claim 1 , wherein the coated article is configured to have, measured monolithically, at least two of: (i) a transmissive ΔE* value of no greater than 2.3 upon a reference heat treatment for 16 minutes at a temperature of about 650 degrees C., (ii) a glass side reflective ΔE* value of no greater than 2.0 upon the reference heat treatment for 16 minutes at a temperature of about 650 degrees C., and (iii) a film side reflective ΔE* value of no greater than 3.0 upon the reference heat treatment for 16 minutes at a temperature of about 650 degrees C.
18. The coated article of claim 1 , wherein said coating has a sheet resistance (R s ) of no greater than 10 ohms/square.
19. The coated article of claim 1 , wherein said coated article, measured monolithically, has a visible transmission of at least 40%.
20. The coated article of claim 1 , wherein the coating as deposited further comprises a first amorphous or substantially amorphous layer comprising zinc stannate located on the glass substrate over at least the first IR reflecting layer comprising silver.
21. The coated article of claim 20 , wherein the first amorphous or substantially amorphous layer comprising zinc stannate has a metal content of from about 40-60% Zn and from about 40-60% Sn (wt. %).
22. The coated article of claim 1 , wherein the at least one dielectric layer comprising monoclinic phase may be configured to have a monoclinic peak thereof reduce upon said reference heat treatment.
23. The coated article of claim 1 , wherein the coating further comprises:
a second IR reflecting layer comprising silver located on the glass substrate over at least the first IR reflecting layer comprising silver,
a second crystalline or substantially crystalline layer comprising zinc oxide doped with from about 1-30% Sn (wt. %), located under and directly contacting the second IR reflecting layer comprising silver;
wherein no silicon nitride based layer is located between the glass substrate and the second IR reflecting layer comprising silver; and
wherein the layer comprising silver of the absorber film does not directly contact any of the first and second IR reflecting layers.
24. The coated article of claim 1 , wherein the coated article is not thermally tempered.
25. The coated article of claim 1 , wherein the at least one dielectric layer comprising monoclinic phase comprises ZrO 2 .
26. The coated article of claim 1 , wherein the at least one dielectric layer comprising monoclinic phase consists essentially of the oxide of zirconium.
27. The coated article of claim 1 , wherein the at least one dielectric layer comprising monoclinic phase is configured to realize a density change of at least 0.25 g/cm 3 upon said reference heat treatment.
28. The coated article of claim 1 , wherein the at least one dielectric layer comprising monoclinic phase is configured to realize a density change of at least 0.30 g/cm 3 upon said reference heat treatment.
29. The coated article of claim 1 , wherein the at least one dielectric layer comprising monoclinic phase is configured to realize a density change of at least 0.35 g/cm 3 upon said reference heat treatment.
30. The coated article of claim 1 , wherein the at least one dielectric layer comprising monoclinic phase comprises an oxide of zirconium, and has a metal content of at least 80% Zr.
31. The coated article of claim 1 , wherein the at least one dielectric layer comprising monoclinic phase and comprising the oxide of zirconium has a thickness of from 40-170 Å.
32. The coated article of claim 1 , wherein the at least one dielectric layer comprising monoclinic phase and comprising the oxide of zirconium, further comprises Si.
33. The coated article of claim 1 , wherein the coated article is configured to have, measured monolithically, at least two of: (i) a transmissive ΔE* value of no greater than 3.0 upon a reference heat treatment for 12 minutes at a temperature of about 650 degrees C., (ii) a glass side reflective ΔE* value of no greater than 1.5 upon the reference heat treatment for 12 minutes at a temperature of about 650 degrees C., and (iii) a film side reflective ΔE* value of no greater than 1.5 upon the reference heat treatment for 12 minutes at a temperature of about 650 degrees C.
34. The coated article of claim 1 , wherein the coated article is configured to have, measured monolithically, all three of: (i) a transmissive ΔE* value of no greater than 3.0 upon a reference heat treatment for 12 minutes at a temperature of about 650 degrees C., (ii) a glass side reflective ΔE* value of no greater than 1.5 upon the reference heat treatment for 12 minutes at a temperature of about 650 degrees C., and (iii) a film side reflective ΔE* value of no greater than 1.5 upon the reference heat treatment for 12 minutes at a temperature of about 650 degrees C.
35. A coated article including a coating on a glass substrate, wherein the coating comprises:
a layer comprising zinc oxide provided on the glass substrate;
a first infrared (IR) reflecting layer comprising silver located on the glass substrate and directly over and contacting the layer comprising zinc oxide;
wherein no silicon nitride based layer is located directly under and contacting the layer comprising zinc oxide;
at least one dielectric layer comprising monoclinic phase and comprising an oxide of zirconium;
wherein the at least one dielectric layer comprising monoclinic phase and comprising the oxide of zirconium is located: (1) between at least the glass substrate and the layer comprising zinc oxide, and/or (2) between at least the first IR reflecting layer comprising silver and a second IR reflecting layer comprising silver of the coating; and
wherein the coated article is configured to have, measured monolithically, all of: (i) a transmissive ΔE* value of no greater than 3.0 upon a reference heat treatment for 12 minutes at a temperature of about 650 degrees C., and (ii) a glass side reflective ΔE* value of no greater than 3.0 upon the reference heat treatment for 12 minutes at a temperature of about 650 degrees C.
36. The coated article of claim 35 , wherein the coated article is not thermally tempered.
37. The coated article of claim 35 , wherein the at least one dielectric layer comprising monoclinic phase includes two layers comprising zirconium oxide, one of which is located (1) between at least the glass substrate and the layer comprising zinc oxide, and the other of which is located (2) between at least the first and second IR reflecting layers comprising silver.
38. The coated article of claim 35 , wherein the at least one dielectric layer comprising monoclinic phase comprises from 0-5% nitrogen (atomic %).
39. The coated article of claim 35 , wherein the at least one dielectric layer comprising monoclinic phase and comprising the oxide of zirconium, further includes Si.
40. The coated article of claim 35 , wherein the at least one dielectric layer comprising monoclinic phase consists essentially of an oxide of zirconium.
41. The coated article of claim 35 , wherein the at least one dielectric layer comprising monoclinic phase is configured to realize a density change of at least 0.25 g/cm 3 upon said reference heat treatment, and
wherein the at least one dielectric layer comprising monoclinic phase may be configured to have a monoclinic peak thereof reduce upon said reference heat treatment.
42. The coated article of claim 35 , wherein the at least one dielectric layer comprising monoclinic phase is configured to realize a density change of at least 0.30 g/cm 3 upon said reference heat treatment.
43. The coated article of claim 35 , wherein the at least one dielectric layer comprising monoclinic phase is configured to realize a density change of at least 0.35 g/cm 3 upon said reference heat treatment.
44. The coated article of claim 35 , wherein the at least one dielectric layer comprising monoclinic phase has a metal content of at least 80% Zr.
45. The coated article of claim 35 , wherein the at least one dielectric layer comprising monoclinic phase has a thickness of from 40-250 Å.
46. The coated article of claim 35 , wherein the at least one dielectric layer comprising monoclinic phase further comprises tetragonal phase.
47. The coated article of claim 35 , wherein the coated article is configured to have, measured monolithically, at least two of: (i) a transmissive ΔE* value of no greater than 3.0 upon a reference heat treatment for 12 minutes at a temperature of about 650 degrees C., (ii) a glass side reflective ΔE* value of no greater than 1.5 upon the reference heat treatment for 12 minutes at a temperature of about 650 degrees C., and (iii) a film side reflective ΔE* value of no greater than 1.5 upon the reference heat treatment for 12 minutes at a temperature of about 650 degrees C.
48. The coated article of claim 35 , wherein the coated article is configured to have, measured monolithically, all three of: (i) a transmissive ΔE* value of no greater than 3.0 upon a reference heat treatment for 12 minutes at a temperature of about 650 degrees C., (ii) a glass side reflective ΔE* value of no greater than 1.5 upon the reference heat treatment for 12 minutes at a temperature of about 650 degrees C., and (iii) a film side reflective ΔE* value of no greater than 1.5 upon the reference heat treatment for 12 minutes at a temperature of about 650 degrees C.
49. A method of making a coated article including a coating on a glass substrate, the method comprising:
sputter-depositing a layer comprising zinc oxide on the glass substrate;
sputter-depositing a first infrared (IR) reflecting layer comprising silver on the glass substrate over and contacting the layer comprising zinc oxide;
sputter-depositing at least one dielectric layer comprising monoclinic phase on the glass substrate, wherein the dielectric layer comprising monoclinic phase comprises an oxide of zirconium;
wherein the at least one dielectric layer comprising monoclinic phase and comprising the oxide of zirconium is located: (1) between at least the glass substrate and the layer comprising zinc oxide, and/or (2) between at least the first IR reflecting layer comprising silver and a second IR reflecting layer comprising silver of the coating; and
wherein the coated article is configured to have, measured monolithically, all of: (i) a transmissive ΔE* value of no greater than 3.0 upon a reference heat treatment for 12 minutes at a temperature of about 650 degrees C., and (ii) a glass side reflective ΔE* value of no greater than 3.0 upon the reference heat treatment for 12 minutes at a temperature of about 650 degrees C.
50. The method of claim 49 , wherein said sputter-depositing the at least one dielectric layer comprising monoclinic phase on the glass substrate uses an oxygen gas flow of at least 6 ml/kW.
51. The method of claim 49 , wherein said sputter-depositing the at least one dielectric layer comprising monoclinic phase on the glass substrate uses an oxygen gas flow of at least 8 ml/kW.
52. The method of claim 49 , wherein said at least one dielectric layer comprising monoclinic phase comprises ZrO 2 .
53. The method of claim 49 , wherein the coated article is configured to have, measured monolithically, all three of: (i) a transmissive ΔE* value of no greater than 3.0 upon a reference heat treatment for 12 minutes at a temperature of about 650 degrees C., (ii) a glass side reflective ΔE* value of no greater than 1.5 upon the reference heat treatment for 12 minutes at a temperature of about 650 degrees C., and (iii) a film side reflective ΔE* value of no greater than 1.5 upon the reference heat treatment for 12 minutes at a temperature of about 650 degrees C.
54. The method of claim 49 , further comprising heat treating the coated article via said reference heat treatment so that the at least one dielectric layer comprising monoclinic phase realizes a density change of at least 0.25 g/cm 3 upon said reference heat treatment.
55. The method of claim 49 , wherein said sputter-depositing the at least one dielectric layer comprising monoclinic phase on the glass substrate uses a metal target.
56. The method of claim 55 , wherein said sputter-depositing at least one dielectric layer comprising monoclinic phase on the glass substrate uses an oxygen gas flow of at least 6 ml/kW.
57. The method of claim 49 , wherein said sputter-depositing the at least one dielectric layer comprising monoclinic phase on the glass substrate uses a ceramic target.
58. The method of claim 49 , wherein said at least one dielectric layer comprising monoclinic phase further comprises tetragonal phase.
59. The method of claim 49 , wherein the at least one dielectric layer comprising monoclinic phase is configured to have a monoclinic peak thereof reduce upon said reference heat treatment.
60. A coated article including a coating on a glass substrate, wherein the coating comprises:
a layer comprising zinc oxide provided on the glass substrate;
a first infrared (IR) reflecting layer comprising silver located on the glass substrate and directly over and contacting the layer comprising zinc oxide;
wherein no silicon nitride based layer is located directly under and contacting the layer comprising zinc oxide;
at least one dielectric layer comprising monoclinic phase and comprising metal oxide;
wherein the at least one dielectric layer comprising monoclinic phase and comprising metal oxide is located: (1) between at least the glass substrate and the layer comprising zinc oxide, and/or (2) between at least the first IR reflecting layer comprising silver and a second IR reflecting layer comprising silver of the coating; and
wherein the coated article is configured to have, measured monolithically, all of: (i) a transmissive ΔE* value of no greater than 3.0 upon a reference heat treatment for 12 minutes at a temperature of about 650 degrees C., and (ii) a glass side reflective ΔE* value of no greater than 3.0 upon the reference heat treatment for 12 minutes at a temperature of about 650 degrees C.