Conductive paste for front electrode of silicon crystal solar battery

Abstract

The invention discloses a conductive paste for a front electrode of a silicon crystal solar battery. The conductive paste is composed of the following materials in percentage by weight: 70%-92% of conductive phase, 1%-10% of glass phase and 5%-25% of organic phase; the conductive phase is composed of 80-99% of silver powder and 1-20% of titanium powder; the organic carrier is composed of the following constituents in parts by weight: 0.2-1 part of thickening agent, 6-9.2 parts of solvent, 0.1-1 part of thixotropic agent, 0.05-0.5 part of surface active agent, 0.3-2 parts of plasticizing agent and 0.05-0.2 parts of coupling agent; the thickening agent is at least one of ethyl cellulose, hydroxyethylcellulose, rosin, acrylic ester and phenolic resin; the thixotropic agent comprises at least one of acrylic resin, hydrogenated castor oil and polyethylene wax; and the surface active agent generally is at least one of lecithin, sorbitan tristearate, zinc stearate, sodium stearate and dodecanol ester. The conductive paste disclosed by the invention can be used for not only maintaining the existing technical performance, but also greatly reducing the cost of the conductive paste, thereby improving the competitive power of the silicon crystal solar battery.

Description

technical field [0001] The invention relates to a conductive paste for semiconductors, in particular to a conductive paste used for front electrodes of silicon crystal solar cells. Background technique [0002] The main principle of a solar cell is to place a thinner N-type semiconductor on a thicker P-type semiconductor by using semiconductor materials. When photons hit the surface of the device, there is electron diffusion at the junction of P-type and N-type semiconductors. The current can be drawn out by using the metal conductors at the upper and lower ends. The electrode connected to the N-type semiconductor is called the front electrode. [0003] Currently, the main method for preparing front electrodes is a screen printing process. The silver electronic paste for the positive electrode of crystalline silicon solar cells is a sinterable thick film conductive paste, which is printed on the silicon wafer by screen printing process, and then heat-treated to form the fr...

AI Technical Summary

Problems solved by technology

[0010] The current conductive phase is mainly composed of silver powder, which has many advantages such as low resistivity, not easy to oxidize, good solderability, etc., but the high price of silver makes the cost higher

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