Glass powder, conductive silver paste, solar cell back electrode and solar cell

The invention provides glass powder, conductive silver paste, a solar cell back electrode and a solar cell. The raw materials for forming the glass powder comprise 3 to 7 parts by weight of cerium oxide; 10-60 parts by weight of bismuth oxide; 5-20 parts by weight of silicon dioxide; 0.5 to 10 parts by weight of alumina; 0.5 to 11 parts by weight of sodium oxide; 0.1 to 5 parts by weight of titanium dioxide and 1-10 parts by weight of zinc oxide. The glass powder has low cost and is beneficial to large-scale production, and a glass layer obtained after sintering the glass powder can efficiently reflect long-wavelength light, and when the glass powder is applied to the solar cell, the utilization rate of sunlight can be greatly improved, and the short-circuit current of the cell can be improved. 本发明提供了玻璃粉、导电银浆、太阳能电池背面电极和太阳能电池。其中，形成所述玻璃粉的原料包括：氧化铈3-7重量份；氧化铋10-60重量份；二氧化硅5-20重量份；氧化铝0.5-10重量份；氧化钠0.5-11重量份；二氧化钛0.1-5重量份；氧化锌1-10重量份。发明人发现，该玻璃粉成本低，有利于大规模生产，且该玻璃粉烧结之后得到的玻璃层可以高效反射长波长光，应用于太阳能电池中可以大大提高对太阳光的利用率，进而提高电池的短路电流。