PHOTOVOLTAIC CELL HAVING A SUBSTRATE GLASS MADE OF ALUMINOSILICATE GLASS

摘要

The invention relates to a photovoltaic cell, preferably a thin-film photovoltaic cell, having a substrate glass made of aluminosilicate glass, comprising a glass composition which has SiO2 and Al2O3 as well as the alkaline oxide Na2O and the alkaline earth oxides CaO, MgO, and BaO, and optionally further components, the glass composition containing 10 to 16 wt.-% Na2O, > 0 to < 5 wt.-% CaO, and > 1 to 10 wt.-% BaO, and the ratio of CaO:MgO being in the range of 0.5 to 1.7. The aluminosilicate glass used according to the invention is crystallization stable because of the selected quotient of CaO/MgO and has a transformation temperature Tg > 580°C and a processing temperature VA < 1200°C. Therefore, it represents a more thermally stable alternative to soda-lime glass. The object of the invention is also the use of the aluminosilicate glass as a substrate glass, superstrate glass, and/or cover glass for a photovoltaic cells, preferably for thin-film photovoltaic cells, in particular those based on semiconductor composite material, such as CdTe, CIS, or ClGS.