Conductive silver paste for crystalline silicon solar energy gate line

Abstract

The invention discloses a conductive silver paste for a crystalline silicon solar energy gate line. The conductive silver paste consists of the following components in parts by weight: 75-92 parts ofsilver powder, 5-12 parts of organic solvent, 2-3 parts of organic carrier, 0.8-5.3 parts of glass bead powder, 0.1-2 parts of thixotropic agent and 0.5-3 parts of alkylphenol polyoxyethylene ether; the particle diameter D50 of the glass bead powder is 1 to 2 [mu]m; the glass bead powder consists of the following components: tellurium dioxide, bismuth oxide, zinc oxide, molybdenum oxide, lithium oxide, magnesium oxide, aluminum oxide, boric acid and potassium oxide; and the glass bead powder is put into a mixed solution formed by terpineol, butyl carbitol acetate, oleic acid and polyvinyl pyrrolidone to obtain spherical glass beads with an organic coating layer through heat preservation. The conductive silver paste improves the lubricity of the slurry system, increases the ink permeability, and avoids the problem of material loss in fine gate lines; the molten glass is not liable to flow when the slurry is sintered, and the fine line shape is maintained; the conductive silver paste issuitable for fine line printing of narrow opening screen plates; and the slurry system has no material loss, the line width is narrow, and the height to width aspect ratio is large.

Description

technical field [0001] The invention relates to a conductive silver paste for crystalline silicon solar grid lines, belonging to the technical field of solar cell functional materials. Background technique [0002] Photovoltaic cells, as an important branch of new clean energy, have achieved rapid development in recent years. Photovoltaic cell technology is also changing with each passing day. The entire industry chain is actively improving the conversion efficiency of photovoltaic cells and reducing costs through technological innovation, striving to achieve grid parity and replace traditional high pollution. energy. [0003] Crystalline silicon photovoltaic cells are currently the most important type of photovoltaic cells, accounting for more than 90%. The principle of photoelectric conversion is: boron-doped P-type silicon and phosphorus-doped N-type silicon form a PN junction. The junction then absorbs photon energy to excite electron transitions, forming electron-hole ...

AI Technical Summary

Problems solved by technology

If the screen opening is narrow, the ink permeability of the paste printing is poor, and it is easy to cause a local shortage of material in the fine grid after printing, thereby increasing the series resistance of the battery and affecting the photoelectric conversion efficiency of the solar cell.

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