Conductive silver paste

Abstract

The invention relates to conductive silver paste. The conductive silver paste comprises an organic carrier and silver particles, wherein surfaces of the silver particles are modified with organic compounds, the silver particles comprise submicron silver particles and nanoscale silver particles, the grain sizes of the submicron silver particles are 100-1,000 nanometers, and the grain sizes of the nanoscale silver particles are 2-50 nanometers. In the conductive silver paste, the organic compounds for surface modification can be decomposed or detached under a relatively low braking temperature, so that the organic compounds are removed from the surfaces of the silver particles in a gaseous state, and meanwhile, the nanoscale silver particles and the submicron silver particles can be sintered together; and a conductive thin film is prepared by using the conductive silver paste, the conductivity of the transparent conductive thin film can be effectively improved, the yield is improved, and the cost is saved.

Description

technical field [0001] The invention relates to the technical field of electronic paste, in particular to a conductive silver paste. Background technique [0002] Transparent conductive films are used in a wide range of fields, including touch screens, flexible displays, OLED lighting, and solar cells. In optoelectronic devices such as flexible displays or lighting, touch screens, high-performance transparent electrodes are an important part of the device. As a semiconductor transparent film, the transparent conductive film ITO (Indium Tin Oxide) contains about 30% indium element, and indium ore is a rare mineral with scarce sources and expensive prices. The estimated global indium reserves are only about 50,000 tons, of which Mining accounts for 50%, and the vacuum ITO sputtering technology coating cost is high; after the film is formed, it is etched by laser to produce the required pattern, and a large part of the raw materials are wasted in the etching process. Huge and...

AI Technical Summary

Problems solved by technology

[0003] Traditional ITO films have the following defects in terms of flexibility, conductivity and light transmittance: relatively high production costs; limited reserves of rare metal indium; relatively brittle materials; low infrared transmittance, which limits the application in flexible electrodes

[0006] In the prior art, the function of transparent conduction can be partially realized by using common non-specialized silver paste for metal grids. However, the existing silver paste has some interactions with polymer substrates such as PET (polyethylene terephthalate). Problems such as low adhesion, easy to fall off, broken grid lines, and cracked side walls of metal silver grid lines have greatly affected product yield, especially on PET substrates larger than 50 inches, broken lines, cracked side walls, etc. The problem seriously reduces the yield of the product

At the same time, the heating temperature is above 150°C. Due to the influence of heating and stretching, it is difficult for the PET substrate to withstand the temperature of 150°C.

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