A front-side fine-grid silver paste for a TOPCon solar cell, a preparation method and application thereof

By combining binary graded silver powder and core-shell structured glass powder, the problems of high contact resistance and low open-circuit voltage in TOPCon solar cells have been solved, achieving high-efficiency cell performance and reliability, and improving the photoelectric conversion efficiency and welding strength of the cells.

CN122136097APending Publication Date: 2026-06-02HANGZHOU RIGHTSILVER ELECTRONICS MATERIAL
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HANGZHOU RIGHTSILVER ELECTRONICS MATERIAL
Filing Date
2026-04-16
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing front-side silver pastes used in TOPCon solar cells suffer from problems such as high contact resistance, excessive damage to the emitter leading to a drop in open-circuit voltage, or insufficient aspect ratio of fine grid lines, making it difficult to meet the requirements for high efficiency and high reliability.

Method used

A combination of binary graded silver powder, core-shell structured glass powder, and organic carrier is used. Micron-sized spherical silver powder and submicron-sized flake silver powder are combined to form a continuous conductive network. The core-shell structured glass powder precisely etches the SiNx layer, the mixed solvent controls the drying speed, and the thixotropic agent ensures high-precision printing, forming a stable thixotropic structure.

Benefits of technology

It significantly reduces electrode body resistance, improves open-circuit voltage and fill factor, ensures clear grid line morphology without breaks, has high printing speed and welding reliability, and improves the photoelectric conversion efficiency of the battery.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure SMS_1
    Figure SMS_1
Patent Text Reader

Abstract

This application belongs to the technical field of solar cells, specifically disclosing a front-side fine grid silver paste for TOPCon solar cells, its preparation method, and its application. The front-side fine grid silver paste for TOPCon solar cells comprises: a conductive phase: 87-91 parts of binary graded silver powder, which is composed of micron-sized spherical silver powder and submicron-sized flake silver powder in a mass ratio of 6-7:4-3; an inorganic binder phase: 1-2.5 parts of composite glass powder, which has a core-shell structure, consisting of a core and an outer shell, with the core primarily composed of TeO₂-Bi₂O₃-ZnO and the outer shell primarily composed of Bi₂O₃-SiO₂-B₂O₃; and an organic carrier: comprising a mixed solvent, a composite resin, and a thixotropic agent. The synergistic effect of these components results in a silver paste with good photoelectric conversion efficiency, tensile strength, high open-circuit voltage, short-circuit current, and fill factor when applied to TOPCon cells.
Need to check novelty before this filing date? Find Prior Art