Metallization production method of efficient solar cells

Abstract

Disclosed is a metallization production method of efficient solar cells. The metallization production method comprises step 1, performing chemical etching and surface texturing after silicon wafers are polished and cleaned; step 2, performing phosphorus doping on the front sides and the back sides of the cells simultaneously to form and produce p-n junctions; step 3, removing phosphorosilicate glass on the surface; step 4, performing thermal oxidation through a tubular diffusion furnace to form passivation antireflection coatings through machining; step 5, utilizing PECVD (Plasma Enhanced Chemical Vapor Deposition) to form surface masks through machining, etching positive electrode graphics on a mask layer through silk screen printing and brushing thin silver paste once; step 6, performing the silk screen printing on the aluminum back surface field and back electrodes and performing back sintering to enable silver silicon metal materials to be alloyed and namely that sintered silver is obtained; step 7, utilizing alternative metallic materials on the surface of front sintered silver so as to increase the thickness of grid lines, wherein the alternative metal is electroplating silver or electroplating nickel, copper and tin; step 8, annealing the cells; step 9, achieving sorting and packing of the cells after a power test, an electrical conductivity test and a strength test of the cells are achieved. The metallization production method of the efficient solar cells is low in cost.

Description

technical field [0001] The invention relates to the technical field of battery manufacturing, in particular to a metallization manufacturing method for high-efficiency solar cells. Background technique [0002] At present, the application of high-efficiency battery technology in the market has caused an increase in cost without exception, making the promotion of technology lagging behind. Among them, polycrystalline solar cells are representative of MWT cells, mainly because of the increase in the production cost of components. Another On the one hand, the improvement of material performance from raw material and auxiliary material manufacturers has made the difference in advantages less and less obvious. Representative ones are: [0003] 1) Silver paste companies represented by DuPont and Heraeus have launched front silver pastes suitable for 90ohm or even higher square resistance, which affects the advantages of selective emitter cells; [0004] 2) In recent years, mesh ...

AI Technical Summary

Problems solved by technology

[0011] The metal on the surface of the solar cell is made of silver metal, so the cost of the metal is high, and the cost of the silver electrode reaches 40% of the total non-silicon cost of the cell; in addition, with the existing screen printing technology, it is not possible to print very fine and high cost on the cell surface. Grid lines (electrodes) with uniform width, resulting in large battery series resistance and poor passivation effect on the battery surface