A printing glass paste process

Abstract

A glass paste printing process comprises the steps of S1, disposing a glass paste; S2, printing the glass paste onto the surface of a silicon wafer by screen printing. The S1 includes S11 of melting cellulose into a solution in proportion to form a first mixed solution; S12, melting a thixotropic agent proportionally into a first mixed solution to prepare a second mixed solution; S13, melting a certain amount of glass powder into the second mixed solution to prepare the glass paste. Compared with the original process, the invention has the beneficial effects that the utilization ratio of the glass paste is 90-100%, which is much higher than the utilization rate of 60%-80% of the traditional electrophoresis process, saving the paste and saving the cost. The amount of chemicals used for theglass paste is small and does not require as much acetone as in the electrophoresis process, thereby reducing a maximum safety hazard.

Description

technical field [0001] The application belongs to the technical field of GPP production, in particular, it relates to a process for printing glass paste. Background technique [0002] GPP is the abbreviation of Glassivation passivation parts, which is a general term for glass passivation devices. This product is to burn a layer of glass around the P / N junction surface of the tube core to be divided on the basis of the existing ordinary silicon rectifier diffusion sheet. The glass and single crystal silicon have good bonding characteristics, so that the P / N junction Get the best protection from the intrusion of the external environment, improve the stability of the device, and have excellent reliability. Therefore, GPP is more and more widely used in the electronic field. The corresponding GPP production process has attracted more and more attention in the industry. How to produce GPP more effectively, faster and with higher quality has become a topic. At present, the comm...

AI Technical Summary

Problems solved by technology

[0003] This electrophoresis process has many disadvantages

First of all, the uniformity of the electrophoretic fluid depends on the ultrasonic effect, but in practice, the ultrasonic wave is easy to attenuate, thus affecting the uniformity of the electrophoretic fluid, resulting in uneven glass in the electrophoretic tank, and directly affecting the appearance and electrical properties of GPP.

Secondly, the glass powder in the electrophoretic fluid cannot be fully utilized, and the utilization rate is only 60-80%.

Again, a large amount of acetone, the electrophoretic fluid medium, is required, but acetone has a very low ignition point and is easy to catch fire, which poses a great safety hazard