The glass substrate for a solar cell of the present invention is characterized by having a glass composition including, in terms of mass %, 50 to 80% of SiO2, 5 to 20% of Al2O3, 0 to 20% of B2O3, 0 to 20% of MgO, 0 to 20% of CaO, 0 to 20% of SrO, 0 to 20% of BaO, 0.001 to 2% of SnO2, 0 to 1% of As2O
The glass substrate for a solar cell of the present invention is characterized by having a glass composition including, in terms of mass %, 50 to 80% of SiO2, 5 to 20% of Al2O3, 0 to 20% of B2O3, 0 to 20% of MgO, 0 to 20% of CaO, 0 to 20% of SrO, 0 to 20% of BaO, 0.001 to 2% of SnO2, 0 to 1% of As2O3, having a mass ratio SnO2/(Fe2O3+SnO2) of 0.9 or more, and having a difference between transmittances at a wavelength of 400 nm before and after irradiation with ultraviolet ray of 2% or less.
대표청구항▼
1. A glass substrate for a solar cell, which has a glass composition comprising, in terms of mass %, 50 to 80% of SiO2, 5 to 20% of Al2O3, 0 to 20% of B2O3, 0 to 20% of MgO, 0 to 20% of CaO, 0 to 20% of SrO, 0 to 20% of BaO, 0.001 to 2% of SnO2, 0 to 0.1% of Sb2O3, and 1 to 500 ppm of Fe2O3, has a m
1. A glass substrate for a solar cell, which has a glass composition comprising, in terms of mass %, 50 to 80% of SiO2, 5 to 20% of Al2O3, 0 to 20% of B2O3, 0 to 20% of MgO, 0 to 20% of CaO, 0 to 20% of SrO, 0 to 20% of BaO, 0.001 to 2% of SnO2, 0 to 0.1% of Sb2O3, and 1 to 500 ppm of Fe2O3, has a mass ratio SnO2/(Fe2O3+SnO2) of 0.95 or more, and has a difference between transmittances at a wavelength of 400 nm before and after irradiation with ultraviolet ray of 2% or less. 2. A glass substrate for a solar cell according to claim 1, wherein the glass composition further comprises 0 to 1% of As2O3. 3. A glass substrate for a solar cell according to claim 1, which has a glass composition comprising, in terms of mass %, 0 to 20% of a total amount of Li2O, Na2O, and K2O. 4. A glass substrate for a solar cell according to claim 1, which is substantially free of As2O3. 5. A glass substrate for a solar cell according to claim 1, which has a transmittance of 90% or more at a plate thickness of 0.7 mm and at a wavelength of 400 nm to 1,000 nm. 6. A glass substrate for a solar cell according to claim 1, which has a density of 2.8 g/cm3 or less. 7. A glass substrate for a solar cell according to claim 1, which has a thermal expansion coefficient at 30 to 380° C. of 37 to 100×10−7/° C. 8. A glass substrate for a solar cell according to claim 1, which has a strain point of 500° C. or higher. 9. A glass substrate for a solar cell according to claim 1, which has a liquidus viscosity of 104.0 dPa·s or more. 10. A glass substrate for a solar cell according to claim 1, which has a Young's modulus of 68 GPa or more. 11. A glass substrate for a solar cell according to claim 1, which is formed by an overflow down draw method.
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