Method for preparing silver paste used for back electrode of photovoltaic cell
A photovoltaic cell and back electrode technology, which is applied to conductive materials, circuits, and electrical components dispersed in non-conductive inorganic materials, can solve problems such as limited effects, reduce production losses, improve slurry fineness, and improve dispersion. sexual effect
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Embodiment 1
[0020] (1) The organic system for preparing the silver paste is to dissolve ethyl cellulose in oleic acid at a temperature of 50 ° C, wherein the mass ratio of the thickener ethyl cellulose and the slurry solvent oleic acid in the slurry system is 2 % and 20%.
[0021] (2) adding diluent solvent methanol, the quality of which is 5 times that of the slurry organic system;
[0022] (3) Add superfine silver powder (particle size is 1 micron, and the surface is covered with 1% polyvinylpyrrolidone) and glass powder, and their mass ratio in the slurry system is 75% and 3%; 1000-2000rmp) disperse the whole system at high speed while heating, and evaporate the dilution solvent at a temperature of 60°C;
[0023] (4) The slurry system is ground by a three-roll mill, and the fineness is adjusted to 8 microns to prepare a photovoltaic cell back electrode silver paste.
Embodiment 2
[0025] (1) The organic system for preparing the silver paste is to dissolve the thickener polyethylene glycol in the slurry solvent xylene at a temperature of 70°C, wherein the thickener polyethylene glycol and the slurry solvent xylene are in the slurry system The mass ratio of 3% and 25%.
[0026] (2) adding diluting solvent acetone, it has good compatibility with the polymer protective agent wrapped on the surface of the silver powder and is volatile, and its quality is 3 times that of the slurry organic system;
[0027] (3) Add ultra-fine silver powder (particle size is 1.5 microns, and the surface is covered with 0.9% Span-80) and glass powder, and their mass ratio in the slurry system is 70% and 2%; For 1000-2000rmp), the whole system is dispersed at high speed, heated at the same time, and the dilution solvent is evaporated at a temperature of 50 °C;
[0028] (4) The slurry system is ground by a three-roll mill, and the fineness is adjusted to 6 microns to prepare a ph...
Embodiment 3
[0030] (1) The organic system of preparing the silver paste is to dissolve the thickener hydrogenated castor oil in the slurry solvent terpineol at a temperature of 60 ° C, wherein the thickener hydrogenated castor oil and the slurry solvent terpineol are in the slurry system The mass ratio in 2% and 30%.
[0031] (2) adding diluting solvent ethanol, it has good compatibility with the polymer protective agent wrapped on the surface of the silver powder and is volatile, and its quality is 8 times that of the slurry organic system;
[0032] (3) Add superfine silver powder (particle size is 0.8 microns, and the surface is coated with 1.2% fatty acid) and glass powder, and their mass ratio in the slurry system is 65% and 3%; 2000rmp) disperse the whole system at high speed while heating, and evaporate the dilution solvent at a temperature of 70°C;
[0033] (4) The slurry system is ground by a three-roll mill, and the fineness is adjusted to 7 microns to prepare a photovoltaic cel...
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