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Aluminium paste for preparing crystal silicon solar cell aluminium back surface field and manufacture method thereof

A solar cell and aluminum back field technology, which is applied to circuits, electrical components, semiconductor devices, etc., can solve the problems of reducing the photoelectric conversion efficiency of batteries, affecting the quality of battery production, and unfavorable industrial production, so as to achieve high photoelectric conversion efficiency of batteries and improve Photoelectric conversion efficiency and adhesion, and the effect of improving photoelectric conversion efficiency

Inactive Publication Date: 2014-03-26
湖南威能新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, some aluminum pastes used in the market have a higher linear expansion coefficient of glass powder. During the battery sintering process, due to the difference in linear expansion coefficient between glass powder, aluminum powder and silicon substrate, aluminum cladding and warping will occur in the back field. Problems such as cracking and ash content seriously affect the production quality of the battery and reduce the photoelectric conversion efficiency of the battery
In the aluminum paste introduced in patent CN 100446277C, Ga, In, Tl and other functional elements are added, which can improve battery efficiency, but Ga, In are expensive, and Tl is a toxic substance, which is unfavorable for industrial production

Method used

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  • Aluminium paste for preparing crystal silicon solar cell aluminium back surface field and manufacture method thereof

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Effect test

Embodiment 1

[0039] An aluminum paste for preparing an aluminum back field of a crystalline silicon solar cell, the implementation process is as follows:

[0040] (1) Preparation of organic vehicle: 6% of terpineol, 4% of tributyl citrate, 2% of ethyl cellulose, 1% of leveling agent, 0.5% of surfactant, anti-settling agent according to the mass percentage of slurry 1%, defoamer 0.5%, weigh each component, after the weighing is completed, heat the mixture to 60°C in a water bath, and then stir with an electric mixer until all the organic matter dissolves in each other to obtain an organic carrier;

[0041] (2) Preparation of inorganic glass frit: by mass percentage Bi 2 o 3 20%, SiO 2 15%, ZnO 20%, SnO 2 15%, Al 2 o 3 10%, Sb 2 o 3 15%, MnO 2 2%, K 2 O 3% is formulated into oxide mixed powder, and then mixed in a V-type blender for 4 hours to mix evenly. The uniformly mixed powder material is added into a corundum crucible, heated in a high-temperature furnace to 1500° C. for 20 m...

Embodiment 2

[0046] An aluminum paste for preparing an aluminum back field of a crystalline silicon solar cell, the implementation process is as follows:

[0047] (1) Preparation of organic carrier: 9% terpineol by mass percentage, 1% tributyl citrate, 5% ethyl cellulose, 1% leveling agent, 0.3% surfactant, 0.5% anti-sedimentation agent, Defoamer 0.2% Weigh each component Weigh each component, after the weighing is completed, heat the mixture to 60°C in a water bath, and then stir it with an electric mixer until all the organic matter dissolves in each other to obtain an organic carrier.

[0048] (2) Preparation of inorganic glass frit: by mass percentage Bi 2 o 3 50%, SiO 2 10%, ZnO 30%, SnO 2 2%, Al 2 o 3 3%, Sb 2 o 3 2%K 2 O 1%, CaO 2%, MnO 2 1% is formulated as oxide mixed powder, and then mixed in a V-type blender for 4 hours to mix evenly. The uniformly mixed powder material is added into a corundum crucible, heated in a high-temperature furnace to 1400° C. for 20 minutes, ...

Embodiment 3

[0053] An aluminum paste for preparing an aluminum back field of a crystalline silicon solar cell, the implementation process is as follows:

[0054] (1) Preparation of organic carrier: by mass percentage terpineol 3%, tributyl citrate 7%, ethyl cellulose 3%, leveling agent 0.5%, surfactant 0.4%, anti-settling agent 1%, Defoamer 0.1% Weigh each component, after the weighing is completed, heat the mixture to 60°C in a water bath, and then stir with an electric mixer until all organic matter dissolves in each other to obtain an organic carrier.

[0055] (2) Preparation of inorganic glass frit: by mass percentage Bi 2 o 3 40%, SiO 2 5%, ZnO 40%, SnO 2 7%, Al 2 o 3 1%, Sb 2 o 3 3%, BaO 1%, MnO 2 3% is formulated as oxide mixed powder, and then mixed in a V-type blender for 4 hours to mix evenly. The uniformly mixed powder material is added into a corundum crucible, heated in a high-temperature furnace to 1450° C. for 20 minutes, and then water-quenched to obtain glass gra...

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Abstract

The invention relates to an aluminium paste for preparing a crystal silicon solar cell aluminium back surface field and a manufacture method thereof. The paste comprises the following components in percentage by weight: 40-80wt% of aluminium powder, 3-45wt% of aluminium-silicon alloy powder, 0.5-10wt% of lead-free glass powder, 10-26wt% of organic solvent, 2-12wt% of thickening agent and 0.3-6wt% of organic addition agent. The manufacture method for the aluminium paste comprises the following steps: preparing the aluminium-silicon alloy powder; preparing the lead-free glass powder; preparing an organic carrier; proportioning all components; and synthetizing slurry. The aluminium paste has the advantages of reasonable component proportion, simple preparation technology, good adhesive force between the prepared aluminium paste and a solar cell silicon substrate, low slurry production cost, high peeling strength of the aluminium back surface field prepared by sintering, good formation of the aluminium back surface field, small cell sheet flexibility and high cell photoelectric conversion rate, and is suitable for industrial production, and the solar cell photoelectric conversion efficiency can be effectively improved.

Description

technical field [0001] The invention relates to an aluminum paste for preparing an aluminum back field of a crystalline silicon solar cell and a manufacturing method thereof. The invention belongs to the technical field of solar cell preparation. technical background [0002] Solar energy is an inexhaustible clean energy source. With the depletion of non-renewable energy sources such as coal and oil, the development and utilization of solar energy has become a hot spot in recent years. A solar cell is a semiconductor device that converts solar energy into electrical energy, and it will become one of the important means of utilizing solar energy. [0003] At present, crystalline silicon solar cells are the leading products in the market. The basic structure of crystalline silicon solar cells consists of a p-type silicon substrate, an n-type layer, and an anti-reflection film (TiO 2 , SiO 2 or Si 3 N 4 ), consisting of a front silver electrode, an aluminum back field elec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/0224
Inventor 张海旺甘景豪刘继宇甘卫平
Owner 湖南威能新材料科技有限公司
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