Fusion Formable Sodium Containing Glass
AssigneeCorsam Technologies LLC
InventorsBruce Gardiner AITKEN, James Edward DICKINSON, JR., Timothy J. KICZENSKI, Michelle Diane PIERSON-STULL
Life of this patent
Estimating the term…
Abstract
Sodium-containing aluminosilicate and boroaluminosilicate glasses are described herein. The glasses can be used as substrates for photovoltaic devices, for example, thin film photovoltaic devices such as CIGS photovoltaic devices. These glasses can be characterized as having strain points ≧540° C., thermal expansion coefficient of from 6.5 to 9.5 ppm/° C., as well as liquidus viscosities in excess of 50,000 poise. As such, they are ideally suited for being formed into sheet by the fusion process.
Claims20
A glass comprising, in weight percent:
- 65 to 75 percent SiO2;
- 1 to 20 percent Al2O3;
- 0 to 3 percent TiO2;
- 0 to 8 percent B2O3;
- 12 to 25 percent total M2O;
- 2 to 5 percent Na2O;
- 8 to 15 percent K2O;
- 1 to 6 percent CaO;
- and
- 1 to 29 percent total RO;
- and
- 0 to 6 percent SrO,
- wherein, M is an alkali metal selected from Na, K, Li, Rb, and Cs,
- wherein R is an alkaline earth metal selected from Mg, Ba, Ca, and Sr,
- wherein the glass has a strain point of 540° C. or greater,
- wherein the glass has a liquidus viscosity greater than or equal to 50,000 poise,
- wherein the glass has a specific gravity greater than 2.42 and less than 2.60, and
- wherein said glass comprises less than or equal to 0.05% by weight of ZrO2.
A glass, comprising
- 56.9 percent SiO2;
- 8.8 percent Al2O3;
- 7.1 percent B2O3;
- 4.0 percent Na2O;
- 8.1 percent K2O;
- 0.9 percent MgO;
- 2.7 percent CaO;
- 0.15 percent SrO;
- and
- 11.4 percent BaO.
A glass, comprising:
- 59.6 percent SiO2;
- 7.4 percent Al2O3;
- 5.6 percent B2O3;
- 3.1 percent Na2O;
- 10.2 percent K2O;
- 0 percent MgO;
- 3.2 percent CaO;
- 0.1 percent SrO;
- and
- 8.5 percent BaO.
Dependencies are inferred from the claim text.