Fusion formable sodium free glass
AssigneeCorsam Technologies LLC
InventorsBruce Gardiner Aitken, James Edward Dickinson, JR., Timothy J. Kiczenski, Michelle Diane Pierson-Stull
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Abstract
A compositional range of fusion-formable, high strain point sodium free, silicate, 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 10.5 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.
Claims23
A glass comprising, in weight percent:
- 35 to 75 percent SiO2;
- 0 to 15 percent Al2O3;
- 0 to 20 percent B2O3;
- 3 to 30 percent K2O;
- 0 to 15 percent MgO;
- 0 to 10 percent CaO;
- 0 to 12 percent SrO;
- 0 to 40 percent BaO;
- and
- 0 to 1 percent SnO2,
- wherein the glass is substantially free of Na2O.
A glass consisting essentially of, in weight percent:
- 35 to 75 percent SiO2;
- 0 to 15 percent Al2O3;
- 0 to 20 percent B2O3;
- 3 to 30 percent K2O;
- 0 to 15 percent MgO;
- 0 to 10 percent CaO;
- 0 to 12 percent SrO;
- 0 to 40 percent BaO;
- and
- 0 to 1 percent SnO2,
- wherein the glass is substantially free of Na2O.
A glass comprising, in weight percent:
- 45 to 75 percent SiO2;
- 3 to 15 percent Al2O3;
- 0 to 20 percent B2O3;
- 14 to 25 percent K2O;
- 0 to 15 percent MgO;
- 0 to 10 percent CaO;
- 0 to 12 percent SrO;
- 0 to 40 percent BaO;
- and
- 0 to 1 percent SnO2,
- wherein the glass is substantially free of Na2O and
- wherein the glass is fusion formable and has a strain point of 540° C. or greater, a coefficient of thermal expansion of 50×10−7 or greater, T200 less than 1630° C., and having a liquidus viscosity of 150,000 poise or greater.
A glass comprising, in weight percent:
- 45 to 75 percent SiO2;
- 3 to 15 percent Al2O3;
- 0 to 20 percent B2O3;
- 3 to 30 percent K2O;
- 0 to 15 percent MgO;
- 0 to 10 percent CaO;
- 0 to 12 percent SrO;
- 0 to 40 percent BaO;
- and
- 0 to 1 percent SnO2,
- wherein the glass is substantially free of Na2O and
- wherein the glass is fusion formable and has a strain point of 540° C. or greater, a coefficient of thermal expansion of 50×10−7 or greater, T200 less than 1630° C., and having a liquidus viscosity of 150,000 poise or greater.
Dependencies are inferred from the claim text.