CN106142822A - A kind of solar silicon wafers just silver Printing screen - Google Patents

Abstract

The present invention is about a kind of solar silicon wafers Printing screen, thin grid line can accomplish that 35um has more 20 thin grid lines than on original base, the grid line having more more effectively receives light activated electronics and the electric current of externally output, and the thin grid of positive silver can use positive silver paste (argentiferous more than 90%) by the first impression drying of thin aperture plate plate elder generation；Positive silver main grid can use positive silver paste (between argentiferous 70%-90%) to be sintered by main grid web plate second printing post-drying, thin grid density of running business into particular one is done height and can be improved the electric current of output by contrast, the silver content of main grid reduces production cost and is greatly lowered, therefore favourable for marketing.

Description

A kind of solar silicon wafers just silver Printing screen

Technical field

The present invention relates to a kind of silicon chip Printing screen, especially with respect to a kind of solar silicon wafers just silver Printing screen.

Background technology

At present solar silicon wafers has been the indispensable assembly of solar battery group, and the silicon chip produced will be The thin grid of the positive silver of its front printing and positive silver main grid, back up back of the body aluminum and back of the body silver, the thin grid of positive silver and positive silver main grid It is one-step print molding, because the prescription of thin grid is higher than the requirement of main grid, and the usable floor area of main grid Big again, printing waste positive silver paste in this way, certain thin grid line directly affects the photoelectricity of cell piece and turns Changing efficiency, constitute key technology main points in manufacture of solar cells, such printing process can not Meet the requirement of energy-conserving and environment-protective.

Summary of the invention:

For the shortcoming of existing solar silicon wafers just silver printing, the present invention provides a kind of solar silicon wafers printing net Plate, thin grid line can accomplish that 35um has more 20 thin grid lines than on original base, and the grid line having more is more effectively Receiving light activated electronics and the electric current of externally output, the thin grid of positive silver can use positive silver paste (argentiferous more than 90%) Dried by the first impression of thin aperture plate plate elder generation；Positive silver main grid can use positive silver paste (between argentiferous 70%-90%) Being sintered by main grid web plate second printing post-drying, thin grid density of running business into particular one is done height and can be improved output by contrast Electric current, the silver content of main grid reduces production cost and is greatly lowered, therefore favourable for marketing.

The present invention is achieved in that a kind of solar silicon wafers just silver Printing screen, and it includes: thin aperture plate Plate, main grid web plate composition is characterized in that: is printed on silicon wafer N face by thin grid by thin aperture plate plate for the first time, By main grid web plate, main grid is printed on N face again after drying, carries out the most again drying sintering, described thin grid Web plate is 35um.

Compared to prior art, present invention have the advantage that

1) thin aperture plate plate can make 35um, and on an equal amount of silicon chip, printing has more 20 than original thin grid The thin grid of root.

2) thin grid printing can use the positive silver paste printing of argentiferous more than 90%, and main grid printing can use argentiferous 70% Above positive silver paste printing.

Accompanying drawing explanation

Fig. 1, thin aperture plate plate schematic diagram

Fig. 2, main grid web plate schematic diagram

The schematic diagram that Fig. 3, positive silver paste order is printed on silicon chip

In figure: 1-web plate, the thin grid of 2-, 3-main grid, 4-silicon chip, the thin grid line of 5-just silver, 6-just silver main gate line.

Detailed description of the invention

Embodiment is further described below in conjunction with accompanying drawing

Seeing accompanying drawing 1,2,3: Fig. 1 is thin aperture plate plate, thin grid line 2 can be made 35um, by thin aperture plate Printer loaded onto by plate 1, is coated in by positive silver paste on thin aperture plate plate 1, the crawl printing upward of silicon chip 4N district is pressed Key, positive silver paste (argentiferous more than 90%) is just printed as the thin grid line 5 on Fig. 3 left side, carries out first drying, then The silicon chip 4 printing thin grid line 5 is put into the printer equipped with main grid 3 web plate, and thin grid line 5 faces up a little Dynamic printing button, positive silver paste (argentiferous 70%-90%) is just printed as thin grid line 5 and main gate line 6 on the right of Fig. 3 The phenomenon of combination, carries out overall sintering of drying the most again, and positive silver adsorbs the most well on the face, N district of silicon chip.

Claims (1)

1. a solar silicon wafers just silver Printing screen, it includes: thin aperture plate plate, main grid web plate form it It is characterised by: by thin aperture plate plate, thin grid are printed on silicon wafer N face for the first time, pass through again after drying Main grid is printed on N face by main grid web plate, carries out drying sintering the most again, and described thin aperture plate plate is 35um。