Front silver paste for crystalline silicon solar battery plate and preparation method thereof

Abstract

The invention provides a front silver paste for a crystalline silicon solar battery plate. The front silver paste comprises silver powder, an inorganic adhesive, an organic resin, an organic solvent, an additive, and organic silver salt. In the silver paste provided by the invention, by adding the organic silver salt, from which nano-scale silver particles and submicron-scale silver particles can be separated out by thermolysis, and filling the gaps of the silver powder with the silver particles separated out by the thermolysis, the contact area among the particles is effectively increased, the conducting path is enhanced, and the conductivity of a film layer is improved; meanwhile, the stacking density of the film layer is also improved and the shrinkage rate of the film layer is reduced. The invention also provides a preparation method of the front silver paste for the crystalline silicon solar battery plate.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a front silver paste for solar cells and a preparation method thereof. Background technique [0002] Both the front and back of the crystalline silicon solar cells are coated with paste, and the paste used on the front is usually conductive silver paste. The performance of conductive silver paste plays a decisive role in the photoelectric conversion efficiency of solar cells. The existing conductive silver paste is generally made of raw materials such as silver powder, inorganic binder, organic resin and organic solvent according to different proportions. After sintering, it has disadvantages such as high shrinkage, low resolution of thin lines, and small aspect ratio, which directly affects Photoelectric conversion efficiency of solar cells. [0003] Currently, research is very active in improving the quality of silver paste for solar cells. For example, Chinese invention...

AI Technical Summary

Problems solved by technology

For example, Chinese invention application CN101118932A (conductive paste for front electrode of solar cell), CN101515604A (silver paste for solar cell and preparation method thereof), CN101609850A (lead-free silver conductor paste for front electrode of solar cell and preparation process thereof), CN101702416A (Preparation method of environment-friendly silicon-based solar cell front silver paste), CN101271928A (high viscosity solar cell front silver paste and preparation method thereof), CN101295739A (solar cell front electrode conductive paste and preparation method thereof), CN101630695A (lead-free and cadmium-free electrode paste for crystalline silicon solar cells and preparation method thereof), CN101359696A (silver conductive paste for front electrodes of solar cells with excellent printing performance) and CN101651155A (a kind of electrode plasma for silicon solar cells) Composition and preparation method), etc., these documents are all related to the improvement of the slurry formula, these formulas can improve some performances of the solar cell to a certain extent, but all do not mention the shrinkage rate of the silver paste, fine line resolution, Performance improvement such as aspect ratio

Images