Abstract: A solar cell, comprising: a substrate, including p-n doping structure formed within said substrate; material attached to the back of said substrate, where said material includes glass mixture, aluminum material, organic medium and additive. Wherein said glass needs to be formed by combining two or more glasses: the main composition for post-mixed glass should include Al2O3, Bi2O5, B2O3, SiO2, PbO, Tl2O3 and other metal and non-metal oxides. For the material composition, aluminum powder content is 60˜80 mass %, with approximately 90 to 99.99% purity. Additives include C10˜C24 stearic acid, with the content of less than 5 mass %. The C10˜C24 stearic acid may include oleic acid. Organic medium content is roughly 20˜35 mass %. Wherein said organic medium includes 60˜90 mass % ether class organic solvent, 10˜20 mass % cellulosic resin and 1˜5 mass % of leveling agent, rheological agent or thixotropic agent.