The invention relates to a
silicon solar cell back
electrode raw material, in particular, an environmentally-friendly low-series resistance
crystalline silicon solar cell back
electrode silver paste. With the environmentally-friendly low-series resistance
crystalline silicon solar cell back
electrode silver paste of the invention adopted, the problems of poor printing performance,
large series resistance and low
photoelectric conversion efficiency of the components of a
silicon solar
cell back electrode can be solved. The environmentally-friendly low-series resistance
crystalline silicon solar
cell back electrode
silver paste is composed of the following components in part by weight: 50 to 58 parts of silver aluminum mixed
powder, 1 to 3 parts of lead-free glass
powder, 0.1 to 1 part of inorganic additive, and 39 to 48 parts of organic
adhesive; the fine degree of the silver paste is smaller than 15 micron; and the
viscosity of the silver paste ranges from30 to 60Pa.s. According to the environmentally-friendly low-series resistance crystalline
silicon solar
cell back electrode silver paste of the invention, irregularly-shaped silver
powder and spherical aluminum powder are adopted as the base materials of the silver paste; a uniform and compact silver conductive layer is formed on the back surface of a silicon
wafer in a high-temperature
sintering treatment process, and excellent
ohmic contact can be realized between the silver conductive layer and an aluminum
back surface field as well as between the silver conductive layer and the silicon
wafer; and therefore, lower series resistance and higher
photoelectric conversion efficiency can be realized, and the
weldability and adhesion of a back electrode can be improved, and the series resistance of a
cell sheet can be small, and conversion efficiency is high.