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Aluminum paste for silicon solar cell

A technology of silicon solar cells and aluminum paste, applied in circuits, electrical components, conductive materials dispersed in non-conductive inorganic materials, etc., can solve problems such as poor sintering performance of aluminum powder, low battery efficiency, and difficult conductive connections. Achieve the effects of reducing curvature, improving conversion efficiency, and improving adhesion

Inactive Publication Date: 2013-04-24
乐凯胶片股份有限公司
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Problems solved by technology

Since the aluminum powder will be oxidized when heated, the aluminum oxide film on the surface of the aluminum powder will be significantly thickened, resulting in poor sintering performance of the aluminum powder, and it is difficult to form a good conductive connection. The depth of the aluminum back field is only 4-6 microns and uneven. low efficiency

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  • Aluminum paste for silicon solar cell
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Embodiment Construction

[0023] The sintering process of solar cells is divided into two stages: pre-sintering and high-temperature sintering. The temperature in the pre-sintering stage is about 300-550°C. At this stage, the organic matter in the aluminum paste undergoes thermal oxidation decomposition, and the organic binder in the aluminum paste is generally Use ethyl cellulose resin or acrylic resin, the decomposition temperature is low, it has been completely decomposed and volatilized at the beginning of sintering, and has lost its protective effect on aluminum powder; the high temperature sintering stage is about 550-850°C, and the melting point of aluminum is 660°C , in the high-temperature sintering stage, the aluminum powder melts and reacts with the silicon matrix to form a silicon-aluminum alloy, and in the subsequent cooling process, the silicon-aluminum alloy segregates to form a silicon layer doped with aluminum atoms—the back surface field (BSF layer ). In the pre-sintering and high-tem...

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Abstract

Provided is an aluminum paste for a silicon solar cell. The aluminum paste comprises, by composition and weight, 50 to 75 parts of aluminum powder, 20 to 45 parts of organic binder, 0.5 to 5 parts of inorganic binder, 0.1 to 5 parts of additive and 0.2 to 10 parts of antioxidants. The antioxidants are composition of inorganic antioxidants and organic antioxidants, and the weight ratio of the inorganic antioxidants and the organic antioxidants is 1:0.5 to 5.0. A product manufactured by the aluminum paste for the silicon solar cell is good in sintering adaptability, and a formed aluminum electrode is smooth in surface, and has no problems of aluminum blisters and ash generating. The aluminum paste for the silicon solar cell is particularly suitable for P-type silicon solar cell materials, a formed back surface field is deep and even, a manufactured cell piece is small in bending degree, a fragment rate is low, and photoelectric conversion efficiency is high.

Description

technical field [0001] The invention relates to the field of new energy, in particular to an aluminum paste for silicon solar cells. Background technique [0002] In recent years, the energy structure of human beings has undergone tremendous changes. Solar cells have been widely used due to their low pollution and easy maintenance during use, and have increasingly become the focus of world attention. Commercial silicon solar cells basically use screen printing to cover the front and rear surfaces of silicon wafers with a certain shape of metal powder filling paste, and form electrodes and back electric fields through a co-sintering process. The metal powder used is used to fill the paste. Generally, silver paste is used for the positive electrode, silver-aluminum paste or silver paste for the back electrode, and aluminum paste for the back electric field and back aluminum electrode. [0003] The aluminum paste used in conventional solar cells is generally composed of alumin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01L31/0224
Inventor 刘子英任明淑马亚男王小记柳青徐建伟朱博苏腾龙
Owner 乐凯胶片股份有限公司
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