Back-contact back-junction solar battery three-dimension electrode and manufacturing method thereof

A technology of solar cells and three-dimensional electrodes, applied in the field of solar cells, can solve the problems of reduced battery performance, uncollected current, and high battery series resistance, and achieves the effects of reducing recombination rate, improving tolerance, and reducing series resistance.

Inactive Publication Date: 2014-02-19
HEFEI HAREON SOLAR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are some deficiencies in the back electrode designed in this way: First, if the electrode preparation adopts the low-cost screen printing technology, the fine grid electrode may have broken grids. If there is only one main grid electrode connecting the fine grid electrodes, then The current in the disconnected part of the fine grid electrode away from the main grid electrode will not be collected; secondly, the carriers generated at the place far away from the main grid electrode need to be collected through the entire fine grid electrode, which will lead to a high series resistance of the battery ; Finally, the contact between the main gate electrode and the silicon substrate will reduce the performance of the battery due to the large recombination

Method used

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  • Back-contact back-junction solar battery three-dimension electrode and manufacturing method thereof
  • Back-contact back-junction solar battery three-dimension electrode and manufacturing method thereof
  • Back-contact back-junction solar battery three-dimension electrode and manufacturing method thereof

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preparation example Construction

[0022] refer to Figure 1 to Figure 6 Describe the preparation method of above-mentioned electrode, its main steps are as follows:

[0023] Deposit silver fine grid electrode 1 (i.e., negative electrode grid line) on the n+ area of ​​the back junction-back junction contact solar cell, with an electrode width of A; deposit aluminum thin grid electrode 2 (i.e., positive electrode grid line) on the p+ area, with an electrode width of It is B, after sintering, the positive and negative fine grid electrodes arranged alternately in interdigitated shape on the back are obtained;

[0024] Deposit insulating ink 3 on the negative electrode fine grid where the positive electrode main grid needs to be prepared on the back of the battery. The thickness of the deposited ink is 10-30 μm, the width of the ink is C, and the length is D, and the ink width C is greater than the width A of the silver fine grid electrode;

[0025] Deposit insulating ink 3 on the positive electrode fine grid wher...

Embodiment 1

[0031] N-type monocrystalline silicon wafers of 1-3.5Ω·cm are used, and the preparation steps are as follows:

[0032] Step 1. Print silver fine grid electrodes with a width of 150 μm on the n+ area on the back of the silicon wafer, and print aluminum fine grid electrodes with a width of 250 μm on the p+ area, and put them into a sintering furnace for sintering;

[0033] Step 2. Use accurate alignment screen printing to print insulating ink on the negative electrode fine grid where the positive electrode main grid needs to be prepared on the back. The thickness of the printing ink is 20 μm, the width of the printing ink is 300 μm, and the length is 1.5 mm; Bit screen printing, printing insulating ink on the positive electrode fine grid where the negative electrode main grid needs to be prepared on the back, the thickness of the printing ink is 20 μm, the width of the printing ink is 300 μm, and the length is 1.5 mm; put the above silicon wafer into the drying furnace Dry in me...

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Abstract

The invention discloses a back-contact back-junction solar battery three-dimension electrode and a manufacturing method thereof. The back-contact back-junction solar battery three-dimension electrode comprises a plurality of negative electrode grid lines printed and sintered on n+areas on the back face of a battery, a plurality of positive electrode grid lines which are printed and sintered on p+areas on the back face of the battery and are arrayed with the negative electrode grid lines in a cross finger shape and in a staggered mode, insulating printing ink printed and dried on the positive electrode grid lines and the negative electrode grid lines, and positive main grid electrodes and negative main grid electrodes printed and dried on positive electrode grid lines with insulating printing ink and the negative electrode gird lines with insulating printing ink. The positive main grid electrodes are isolated with the negative electrode grid lines through the insulating printing ink, and the negative main gride electrodes are isolated with the positive electrode grid lines through the insulating printing ink. The back-contact back-junction solar battery three-dimension electrode and the manufacturing method thereof reduce the distance of current carriers transmitted from thin grid electrodes to main grid electrodes, reduce the series resistance of the battery, and reduce electrode sedimenting difficulty and the composite speed rate in positions of the main gride electrodes.

Description

technical field [0001] The invention relates to a solar cell, in particular to a three-dimensional electrode of a back junction-back contact solar cell and a preparation method thereof. Background technique [0002] In the preparation process of back-junction-back-contact solar cells, the fine grid electrodes on the back are usually designed as interdigitated interdigitated structures, and then the ends of the fine grid electrodes are connected through the main grid electrodes, and the positive and negative electrodes on the back are formed after sintering. [0003] There are some deficiencies in the back electrode designed in this way: First, if the electrode preparation adopts the low-cost screen printing technology, the fine grid electrode may have broken grids. If there is only one main grid electrode connecting the fine grid electrodes, then The current in the disconnected part of the fine grid electrode away from the main grid electrode will not be collected; secondly,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0224H01L31/18
CPCH01L31/022458H01L31/1804Y02E10/547Y02P70/50
Inventor 朱彦斌董经兵李海波邢国强
Owner HEFEI HAREON SOLAR TECH
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