Main grid electrode structure of solar cell and preparation method thereof

A solar cell and busbar electrode technology, which is applied in the field of solar cells, can solve the problems of high cost, high price, and the inability to promote silicon solar cells, and achieve the effects of improving efficiency, reducing damage, and improving surface passivation efficiency

Active Publication Date: 2016-06-22
TAIZHOU LERRISOLAR TECH CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The cost of silver electrodes accounts for 15% of the manufacturing cost of the entire silicon solar cell and is expensiv

Method used

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  • Main grid electrode structure of solar cell and preparation method thereof
  • Main grid electrode structure of solar cell and preparation method thereof
  • Main grid electrode structure of solar cell and preparation method thereof

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0028] like figure 1 As shown, the front electrode structure of a conventional battery includes sub-gates 2 arranged on the front surface of a P-type silicon substrate 4 and main gates 3 arranged alternately with the sub-gates 2 .

[0029] like figure 2 As shown, the present invention proposes a new front electrode of a silicon solar cell, which includes a P-type silicon base 1, and a layer of width 0.02-0.08mm and thickness 0.005-0.030mm is printed on the front surface of the P-type silicon base 1. mm of silver grid line 6; on the metallized silver grid line 6, print solder paste solder joints (or conductive adhesive) 4 as bonding points by screen printing, and the thickness of solder paste solder joints (or conductive adhesive) 4 0.02 ~ 0.15mm, solder paste solder joints (or conductive adhesive) 4 diameters are 0.02 ~ 0.10mm, the number ...

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Abstract

The invention belongs to the technical field of a solar cell, and particularly relates to a main grid electrode structure of a solar cell and a preparation method thereof. A positive electrode comprises a thin grid silver electrode; metal wires are printed on the metallized thin grid silver electrode; and the metal wires are connected with the silver electrode by adhering points. The preparation method comprises the steps of: by adopting a silk-screen printing process, printing the thin grid silver electrode on the positive surface of a P-type silicon matrix processed by processes of texturing, diffusion, post washing, coating and printing of a back field of a back electrode; and then printing a metal wire main grid electrode on the surface of the metallized silver electrode, wherein the metal wires are connected with the silver electrode together by the adhering points. The main grid electrode structure for the solar cell and the preparation method thereof, which are disclosed by the invention, have the advantages that a copper electrode replaces a positive main grid silver electrode so as to reduce the use quantity of the silver electrode of the positive electrode of the silicon solar cell, thereby reducing production cost of the silicon solar cell; and additionally, the copper electrode is used for replacing burn-through silver paste so as to reduce breakage and replacement of a passive film, improve surface passivation efficiency and improve cell efficiency.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and in particular relates to a main grid electrode structure of a solar cell and a preparation method thereof. Background technique [0002] At present, the main component of the electrode material of solar cells (mainly refers to sub-grid and main grid) is silver, and the cost of silver accounts for 15% of current solar cells, which consumes a lot of energy and is expensive. To reduce the manufacturing cost of solar cells, it is crucial to reduce the consumption of Ag without negatively affecting the electrical performance. [0003] like image 3 As shown, the front electrode of the solar cell in the prior art is usually designed by a continuous main grid 3 perpendicular to the auxiliary grid 2 . The current generated in the battery flows from the inside of the battery to the surface of the battery, then passes through the top doped layer laterally, and finally the contact on the top surfac...

Claims

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Application Information

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IPC IPC(8): H01L31/0224
CPCH01L31/022425H01L31/022433Y02E10/50
Inventor 於龙李华钟宝申
Owner TAIZHOU LERRISOLAR TECH CO LTD
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