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Isolation material, cell back field back electrode and production method thereof, solar cell and production method thereof

A technology of solar cells and isolation materials, applied in circuits, photovoltaic power generation, electrical components, etc., can solve the problems of insufficient battery quality or reliability, lowering the resistivity of the electrode area, and inability to weld, and achieve performance such as component welding and reliability. Improvement, improved sintered compactness and thermal expansion coefficient, reduced effect of current collection voids

Pending Publication Date: 2021-06-04
TONGWEI SOLAR (ANHUI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

③ In the overlapping area of ​​silver and aluminum electrodes, it is also easy to form a dense structure, thereby reducing the resistivity of the electrode area
[0004] But there are also the following deficiencies: ①The contact resistance is large and the recombination is serious
The direct contact between the silver electrode and the silicon substrate makes the recombination of carriers in the silver electrode area due to the gold-semi-contact of silver and silicon. Even with the current passivation structure on the back of the PERC cell, the back silver paste still burns through the back dielectric The case where the layer is in contact with the wafer substrate
②Blank area for current collection: For PERC batteries, when the silver electrode area is laser-grooved, it will cause thermal stress during component welding and lead to high fragmentation rate. Therefore, no laser is often used in the back silver electrode area and its surrounding Slots solve this problem, but this creates a blank area for current collection
[0007] However, the all-aluminum back field solution of the authorized patent CN201110208995.7 has the problem of low silver electrode tension or direct welding failure, which cannot meet the welding requirements of components.
The all-aluminum back field solution of the patent CN201810739434.1 solves the problem of component welding, but there is a problem of failure of component cold and hot cycle tests
In addition, the current electrode preparation method of printing silver electrodes first and then printing aluminum backfields has problems such as blank areas for current collection, and there is room for improvement in the conversion efficiency of cells; and the current all-aluminum backfield solutions all have battery quality or The lack of reliability requires further improvement and optimization before it can be promoted and used

Method used

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  • Isolation material, cell back field back electrode and production method thereof, solar cell and production method thereof
  • Isolation material, cell back field back electrode and production method thereof, solar cell and production method thereof
  • Isolation material, cell back field back electrode and production method thereof, solar cell and production method thereof

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Embodiment 1

[0053] combine Figure 4-Figure 9 , the back pole of a kind of solar cell back field of present embodiment, comprises silicon back substrate 21, aluminum electrode 22 and silver electrode 24, and the aluminum electrode 22 of all-aluminum back field is set on the silicon back substrate 21, for single-sided cell, all aluminum The aluminum electrode 22 of the back field is that the aluminum back field covers the entire surface of the silicon back substrate 21. For a double-sided battery, the aluminum electrode 22 of the all-aluminum back field is also covered with an aluminum electrode on the back surface of the silicon wafer in the silver electrode area. The aluminum electrode 22 includes an aluminum electrode main grid 221 and an aluminum electrode sub grid 222, the aluminum electrode sub grid 222 is consistent with the design of a conventional double-sided battery, a laser grooved area 27 is arranged on the silicon back substrate 21, and the aluminum electrode sub grid 222 area...

Embodiment 2

[0057] The solar cell back field back pole structure of the present embodiment is as embodiment 1, and the preparation process of this back field back pole is as follows:

[0058] (1) The aluminum electrode 22 of the all-aluminum back field method is first prepared on the silicon back substrate 21. For a single-sided battery, the aluminum electrode 22 of the all-aluminum back field covers the entire back surface of the silicon wafer for the aluminum back field. For the double-sided battery, the aluminum electrode 22 of the all-aluminum back field is to cover the back surface of the silicon wafer with an aluminum electrode in the silver electrode area. The aluminum electrode sub-gate 222 is consistent with the design of the conventional double-sided battery. This area corresponds to the laser grooved area 27 one-to-one to realize the contact between the aluminum electrode 22 and the silicon back substrate 21, and realize the collection and derivation of the carriers on the back....

Embodiment 3

[0063] The structure and preparation process of the back field and back electrode of the solar cell in this embodiment are basically the same as in Embodiment 1 and Embodiment 2, and the isolation layer 26 inserted between the silver electrode 24 and the aluminum electrode 22 to block the direct contact between the silver electrode and the aluminum electrode The characteristics are as follows:

[0064] The isolation layer 26 is composed of the following ingredients in weight percentage: 35-80% of glass powder; 15-45% of organic vehicle and additives; 0.5-25% of auxiliary powder.

[0065] It is worth noting that the present invention solves the reliability problem of the all-aluminum back field route through the barrier material. The barrier material is mainly composed of glass powder. On the one hand, the glass powder physically separates the silver paste and the aluminum paste to avoid welding problems caused by mutual penetration during co-sintering. In addition, through th...

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Abstract

The invention discloses an isolation material, a cell back field back electrode and a production method thereof, a solar cell and a production method thereof, and belongs to the technical field of crystalline silicon solar cell production. The back field back electrode comprises a silicon back substrate, an aluminum electrode and a silver electrode, the aluminum electrode is arranged on the silicon back substrate, the silver electrode is arranged on the aluminum electrode, an isolation layer is arranged between the silver electrode and the aluminum electrode, and the isolation layer is composed of a glass powder, an auxiliary powder, an organic carrier and auxiliaries. The weight percentage of the glass powder is 35-80%, the weight percentage of the auxiliary powder is 0.5-25%, and the weight percentage of the organic carrier and the auxiliaries is 15-45%. The isolation layer is inserted between the silver electrode and the aluminum electrode to block direct contact between the silver electrode and the aluminum electrode so that mutual permeation of a silver paste and an aluminum paste in a sintering process is effectively isolated, and the improvement or solution of the all-aluminum back field battery on performances such as battery quality, assembly welding, reliability and the like is realized.

Description

technical field [0001] The invention relates to the technical field of preparation of crystalline silicon solar cells, and more specifically relates to an isolation material, a battery back field back electrode and a preparation method, a solar cell and a preparation method. Background technique [0002] At present, electrodes of solar cells are mainly prepared by screen printing. combine Figure 1-Figure 3 , the back electrode is composed of an aluminum electrode main grid 12, an aluminum electrode sub-grid 13 and a silver electrode 14, and the silver and aluminum electrodes are partially overlapped to form an overlapping area 16 to realize mutual connection. The aluminum electrode mainly collects the carriers on the back of the cell, and then conducts the current through the silver electrode. For single-sided batteries, the aluminum electrode area is designed with full aluminum coverage to reduce the resistance of the aluminum electrodes and improve collection efficiency;...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0216H01L31/0224H01L31/18
CPCH01L31/02167H01L31/022441H01L31/1804Y02E10/547Y02P70/50
Inventor 黄智张林裘慧广付冲李忠涌肖俊峰翟绪锦谢泰宏萧圣义
Owner TONGWEI SOLAR (ANHUI) CO LTD
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