Front gate line electrode silver conductor slurry for environment friendly silicon solar cell

Abstract

The invention relates to a formula of an environment-friendly Ag conductor slurry for a silicon solar cell front gate line electrode and a processing method thereof. The component and the content (weight percentage) of the Ag slurry are: a metal Ag powder 60-80, a lead-less glasses adhesive 1-10, an Ohm contact additive agent 0. 05-10, and organic resin 2-15and a slurry modifying agent 1-8 The production method of the environment-friendly Ag conductor slurry comprises a preparation of the lead-less glass adhesive, a formula of the Ag slurry and a processing process of the slurry. The developing Ag slurry implements the slurry lead-free by using a Ba-Zn-B glass material and the lead content of the slurry is less than 100 ppm, while the content of other harmful substances such as Hg and Cd or the like is all conformed to the environment protection demand. A good Ohm contact is formed on the silicon surface of the Ag line and the cell by adding the Ohm contact forming agent in the slurry. The Ag slurry has strong adhesive force, superior weldability, good Ohm contact and high cell conversion efficiency after a continuous tunnel furnace fast heat treatment when the Ag slurry is used in the silicon solar cell front gate line electrode.

Description

technical field

[0001] The invention relates to a silver conductor paste used for front grid wire electrodes of silicon solar cells. After the paste passes through the production process, metal silver wires are formed on the front side of the silicon solar cells to lead out the current generated by the solar cells under light. The silver paste forms a grid line electrode on the front of the silicon solar cell through screen printing, drying, rapid sintering heat treatment and other processes. This grid line electrode has a small shielding surface for the sun's incident light. The surface forms a good ohmic contact, so that the battery sheet has a high photoelectric conversion efficiency. Background technique

[0002] In silicon solar cell technology, electrode fabrication is a very important link. Commonly used electrode technologies include magnetron sputtering, vacuum evaporation, and screen printing. The screen printing process has the characteristics of low production...