Preparation technology of photovoltaic battery front-face electrode

A front electrode and photovoltaic cell technology, applied in the direction of sustainable manufacturing/processing, circuits, electrical components, etc., can solve the problems of restricting the improvement of photovoltaic cell efficiency, restricting the manufacturing cost of photovoltaic cells, increasing the fragmentation rate of printed cells, etc., to achieve The effect of low cost, small electrode resistance, and large electrode aspect ratio

Inactive Publication Date: 2013-10-23
余小翠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For the role of electrical connection, the current silver paste can play a better effect and achieve a relatively low contact resistance, but for the role of a conductor, since the silver paste itself is composed of silver powder, the electrode prepared by it is a porous structure, its conductivity is much worse than that of pure metal dense conductors, which also limits the improvement of electrode conductivity, thus restricting the improvement of photovoltaic cell efficiency
[0004] At present, the conductive paste used for the front metallization of photovoltaic cells is mainly silver paste. Due to the requirement of conductivity, the silver content in the silver paste is very high, reaching about 90%. Seriously restricting the further reduction of photovoltaic cell manufacturing costs
[0005] In addition, the traditional process of using screen printing and silver paste to realize the front metallization of photovoltaic cells is to use the permeability of the screen itself to squeeze the highly viscous silver paste through the mesh under a certain pressure. To the front of the photovoltaic cell, due to the high viscosity of the paste and the small opening of the screen, it takes a lot of pressure to form a qualified electrode pattern. Such a large pressure increases the fragmentation rate when printing the battery. In the future, photovoltaic Under the trend of thinner and thinner battery sheets, the traditional screen printing metallization scheme hinders the application of new technologies

Method used

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preparation example Construction

[0031] A preparation process for a front electrode of a photovoltaic cell, comprising the following steps:

[0032] (1) Preparation of conductive paste: metal powder, metal or non-metallic oxide, organic binder, organic solvent and additives are mixed and stirred evenly to obtain conductive paste; in the described conductive paste, the mass percentage of metal powder The content is 70-90%, the mass percentage of metal or non-metal oxide is 1-10%, the mass percentage of organic binder is 1-10%, and the mass percentage of organic solvent is 1-10% %, the mass percentage of additives is 1-5%;

[0033] (2) Preparation of composite electrode material: the conductive paste is evenly coated on the surface of the conductive wire 1 and dried and cured. The drying and curing temperature of the conductive paste is 50°C-200°C;

[0034] (3) Heat the battery sheet 2 or the composite electrode material 4 at 100°C-500°C, lay the composite electrode material 4 on the front surface of the batte...

Embodiment 1

[0044] For the front electrode of the photovoltaic cell, follow the steps below:

[0045] (1) Preparation of conductive paste: mix and stir metal powder, metal or non-metallic oxide, organic binder, organic solvent and additives evenly to obtain conductive paste; in the conductive paste used, the metal powder is silver powder, conductive According to the weight percentage of the conductive silver paste in the silver paste, metal or non-metal oxide accounts for 5%, organic binder accounts for 5%, organic solvent accounts for 5%, additive accounts for 1%, and the rest is silver powder, the particle size of silver powder The range is 0.1-2μm;

[0046] (2) Preparation of composite electrode material: The conductive paste is evenly coated on the surface of copper wire with a diameter of 10-20 microns, and it is dried and cured. The drying and curing temperature of the conductive paste is 50°C-200°C. The thickness after drying and curing is 5 microns to 10 microns;

[0047](3) Hea...

Embodiment 2

[0053] Photovoltaic battery positive electrode, according to the step with embodiment 1, difference is in the conductive silver paste in embodiment 2 by the weight percentage of conductive silver paste, metal or nonmetallic oxide accounts for 8%, and organic binder accounts for 5%, Organic solvents account for 5%, additives account for 2%, and the rest is silver powder; the number of busbars is 5;

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Abstract

The invention discloses a preparation technology of a photovoltaic battery front-face electrode. The preparation technology includes the following steps that firstly, a conductive paste body is prepared; secondly, composite electrode material is prepared; thirdly, a battery piece or the composite electrode material is heated, the viscosity of the composite electrode material is made to recover, the composite electrode material is paved according to a designed pattern and connected to the front surface of the battery piece in an adhesive mode, and the adhesion processing is completed; fourthly, main grid lines are prepared on the front face of the battery piece; fifthly, the battery piece is placed into a drying furnace and a sintering furnace, the battery piece is dried at 200-500 DEG C and sintered at 500-900 DEG C, the bonding processing is completed, and the front-face electrode is formed. The composite electrode material different from traditional screen printing electrode material silver paste is applied, the electric combination of a composite electrode and alloy on the front face of the battery piece is finally achieved through the two processes of the adhesion processing and the bonding processing, and preparation of the battery front-face electrode is completed. The battery front-face electrode capable of being manufactured with the preparation technology is small in shading area, higher in conductivity and lower in cost.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic cells, and in particular relates to a preparation process of a front electrode of a photovoltaic cell. Background technique [0002] The metallization of the front side of photovoltaic cells is currently mainly achieved by screen printing conductive paste. The electrode prepared by it has a small aspect ratio, a large electrode width, uneven width and serious edge collapse, and a small and uneven electrode height. For photovoltaic cells, large electrode width and serious collapse mean large front shading area, low and uneven electrode height means poor electrode conductivity and high internal resistance of the battery, which seriously affect and restrict the improvement of photovoltaic cell efficiency. [0003] The front electrode of the photovoltaic cell mainly has two functions: on the one hand, the lower part of the electrode forms an alloy and ohmic contact with the front surface of the b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/18
CPCY02P70/50
Inventor 余小翠
Owner 余小翠
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