Glass powder, glass powder mixture and method of manufacture of glass powder

摘要

The present invention provides a glass powder, a glass powder mixture and a process for the manufacture of the glass powder, using the glass powder in the manufacture of a crystalline silicon solar cell paste, and the glass powder a composition of 30 to 90 mass components PbO, 5 to 25 mass components B2O3, 2 to 10 mass components SiOx, 5 to 20 mass components ZnO and 0,1 to 13 mass components MxOy, where M is a first main group element or a second main group element, and the glass powder has a switching temperature between 280 and 400-oC. Whereas the glass powder mixture also includes an auxiliary glass powder, the auxiliary glass powder Bi2O3,B2O3 and ZnO are included. where the glass powder is obtained by drying the raw materials first and then melting in accordance with a defined procedure, the specified procedure comprising a heating phase and a heat retention phase, the temperature of the heat storage phase is set to 950 to 1050 degrees and the duration of the heat storage phase is set to 1 to 2 hours, with the glass powder obtained by cooling, crushing and sieving. The glass powder has a lower switching temperature and a lower expansion coefficient, making it suitable for the production of "co-sintered pastes" for PERC cells.