Lead-free conductive silver paste used for crystalline silicon solar cell and manufacturing method of lead-free conductive silver paste

Abstract

The invention discloses a lead-free conductive silver paste for a crystalline silicon solar cell. The lead-free conductive silver paste is characterized by being prepared from, by weight, 40-50 parts of silver powder, 2-3 parts of methyl formate, 1-2 parts of ethylenediamine tetraacetic acid disodium, 0.4-0.9 part of sodium potassium tartrate tetrahydrate, 1.4-2.6 parts of stearic acid, 2.3-3.6 parts of redispersible latex powder, 0.3-0.7 part of dinonyl naphthalene barium sulfonate, 1.2-2.8 parts of dodecenyl succinic acid, 30-40 parts of additives and appropriate amount of water. Through optimization of the production technology and the formula, oxidization of sliver particles can be effectively reduced, open-circuit voltage and electric performance of the cell can be improved, and therefore the solar cell is high in conversion efficiency.

Description

technical field [0001] The invention relates to the field of conductive silver paste, in particular to a lead-free conductive silver paste for crystalline silicon solar cells and a manufacturing method thereof. Background technique [0002] Conductive silver paste refers to the silver paste printed on the conductive substrate to make it have the ability to conduct current and eliminate the accumulated static charge. It is generally printed on non-conductive substrates such as plastic, glass, ceramics or cardboard. It is made of conductive Filler, binder, solvent and additive composition. The characteristics that the conductive silver paste needs to have are: good conductivity (antistatic property), strong adhesion, good printing adaptability and excellent solvent resistance. However, the current conductive silver pastes on the market have many shortcomings, not only containing Lead, cadmium, etc. are toxic and pollute the environment, and when used on conductive substrates,...

AI Technical Summary

Problems solved by technology

The characteristics that the conductive silver paste needs to have are: good conductivity (antistatic property), strong adhesion, good printing adaptability and excellent solvent resistance. However, the current conductive silver pastes on the market have many shortcomings, not only containing Lead, cadmium, etc. are poisonous and pollute the environment, and when used on conductive substrates, they have low adhesion, poor soldering resistance, and poor sintering performance