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Preparation method for back electrode of solar battery

A solar cell and back electrode technology, which is applied in the field of solar cells, can solve the problems of high silicon chip breakage or hidden crack rate, high cost, etc., and achieve the effects of low chip and hidden crack rate, low production cost, and consistent photoelectric efficiency

Active Publication Date: 2015-07-01
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the high cost of the preparation method of the back electrode of the crystalline silicon solar cell in the prior art and the broken silicon chip or the high crack rate, thereby providing a low cost, broken silicon chip and Preparation method of solar cell back electrode with low crack rate and strong adhesion between back electrode and aluminum back field

Method used

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  • Preparation method for back electrode of solar battery
  • Preparation method for back electrode of solar battery
  • Preparation method for back electrode of solar battery

Examples

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Embodiment 1

[0055] This embodiment provides a method for preparing a back electrode of a solar cell, comprising the following steps:

[0056] Step 1: Preparation of Silicon Wafer

[0057] Select a polysilicon wafer with a specification of 156×156mm and a thickness of 180μm (before corrosion). After the polysilicon wafer is textured, PN junction-made, and anti-reflection film coated, the back-field aluminum paste (Shuohe) is screen-printed on the entire backlight surface. 108C aluminum paste produced by Electronic Materials Co., Ltd.) and dried, then print the front silver paste (17F silver paste produced by Dupont Company), and after sintering in a tunnel furnace, a silicon wafer with an aluminum back field and a positive electrode line is obtained;

[0058] Step 2: Preparation of Brazing Flux

[0059] Heat 70 parts by mass of triethanolamine to 55°C, then add 10 parts by mass of ethyl cellulose (viscosity specification: 20m Pas, produced by Dow, USA), and then add 20 parts by mass of zi...

Embodiment 2

[0066] This embodiment provides a method for preparing a back electrode of a solar cell, comprising the following steps:

[0067] Step 1: Preparation of Silicon Wafer

[0068] Select a polysilicon wafer with a specification of 156×156mm and a thickness of 180μm (before corrosion). After the polysilicon wafer is textured, PN junction-made, and anti-reflection film coated, the back-field aluminum paste (Shuohe) is screen-printed on the entire backlight surface. 108C aluminum paste produced by Electronic Materials Co., Ltd.) and dried, then print the front silver paste (17F silver paste produced by Dupont Company), and after sintering in a tunnel furnace, a silicon wafer with an aluminum back field and a positive electrode line is obtained;

[0069] Step 2: Preparation of Brazing Flux

[0070] Heat 95 parts by mass of triethanolamine to 60°C, then add 15 parts by mass of nitrocellulose (the brand is L-type, produced by Luzhou North Chemical Industry Company), and then add 30 par...

Embodiment 3

[0077] This embodiment provides a method for preparing a back electrode of a solar cell, comprising the following steps:

[0078] Step 1: Preparation of Silicon Wafer

[0079] Select a polysilicon wafer with a specification of 156×156mm and a thickness of 180μm (before corrosion). After the polysilicon wafer is textured, PN junction-made, and anti-reflection film coated, the back-field aluminum paste (Shuohe) is screen-printed on the entire backlight surface. 108C aluminum paste produced by Electronic Materials Co., Ltd.) and dried, then print the front silver paste (17F silver paste produced by Dupont Company), and after sintering in a tunnel furnace, a silicon wafer with an aluminum back field and a positive electrode line is obtained;

[0080] Step 2: Preparation of Brazing Flux

[0081]Heat 80 parts by mass of triethanolamine to 50°C, then add 25 parts by mass of alkyd resin (brand AK2380A, produced by Tongde Chemical Co., Ltd.), and then add 17 parts by mass of cadmium f...

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Abstract

The invention discloses a preparation method for a back electrode of a solar battery. The preparation method includes that using soldering flux to form a soldering flux belt at the surface of an aluminum back field, forming a non-silver metal solder belt at the surface of the soldering flux belt, wherein the soldering flux belt can break an alumina film at the surface of the aluminum back field to expose fresh aluminum from the surface of the aluminum back field, the subsequently fed non-silver metal wires (solder) are melted by the heat effect of a soldering head, the molten liquid fuses with the aluminum, the molten solder is well bonded at the surface of the aluminum back field, the silver use is avoided, the cost is lowered, an ultrasonic vibration device is not used, the intensity of a finished product is obviously improved, fragment and crack are obviously reduced, and the quality of the back electrode of the solar battery is greatly improved. The back electrode of the solar battery prepared by the preparation method is low in fragment and crack rate, the adhesion between the back electrode and aluminum back field is strong, the welding with a photovoltaic soldering belt is good, the average photoelectric efficiency conforms to requirement, and the manufacturing cost is low.

Description

technical field [0001] The invention relates to a method for preparing a back electrode of a solar cell, belonging to the field of solar cells. Background technique [0002] Crystalline silicon solar cells account for more than 80% of the photovoltaic cell market volume and are expected to become the mainstay of future electricity supply. [0003] The traditional method of preparing crystalline silicon solar cell electrodes is the metallization process, specifically: after making polycrystalline silicon wafers into texture, making PN junctions, and coating anti-reflection films, first use screen printing to print the silver paste on the back, and then dry it. For the remaining part of the backlight surface, print the back field aluminum paste, after drying, print the front silver paste on the light side, and after sintering in a tunnel furnace, obtain a solar cell with an aluminum back field, silver back electrode lines and front electrode lines. The process is simple and m...

Claims

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Application Information

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IPC IPC(8): H01L31/18
CPCH01L31/022425H01L31/18Y02E10/50Y02P70/50
Inventor 谭伟华秦世嵘左静
Owner BYD CO LTD
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