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Conductive slurry for front electrode of solar battery

A technology of solar cells and conductive pastes, applied in circuits, electrical components, semiconductor devices, etc., can solve the problems of increased battery series resistance, decreased battery conversion efficiency, and reduced fill factor, and achieves reduced series resistance and light conversion. Efficiency improvement, good comprehensive electrical and mechanical properties

Inactive Publication Date: 2008-02-06
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
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AI Technical Summary

Problems solved by technology

However, during the sintering process, this kind of oxide reacts with the glass, making the viscosity of the glass smaller, and it is easy to form a glass insulating layer between the silicon surface and the electrode, resulting in an increase in the series resistance of the battery and a decrease in the fill factor. Therefore, the conversion efficiency of the battery is reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Silver powder (average particle size: 2.5 μm) 80.7g, glass powder 3.0g, organic phase (terpineol: ethyl cellulose 10:1wt / wt) was 16g, TiO 2 0.3g was pre-mixed in a mixer, and then mixed and rolled on a three-roll machine to obtain a conductive paste. Use this slurry to make the front electrode of the solar cell by screen printing, prepare the solar cell according to the conventional method, measure its fill factor FF, series resistance Rs, conversion efficiency η and electrode peeling strength, and the results are shown in Table 1.

[0025] The definitions and detection methods of fill factor FF, series resistance Rs, conversion efficiency η, and electrode peeling strength are described and reported in detail in published literature on solar cells.

Embodiment 2-4 and comparative example 1-3

[0027] In embodiment 2-4 and comparative example 1-3, conductive paste preparation process and battery preparation process are similar to embodiment 1, except changing the content of silver powder and glass phase, and different additives and addition, its composition and battery performance The results are shown in Table 1.

[0028] Table 1 Conductive paste composition and solar cell performance

[0029] project

[0030] Take the filling factor FF, series resistance Rs, and light conversion efficiency η of the comparative example as 1, and compare the relative values ​​of the others.

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Abstract

The present invention relates to a conductive paste for the front surface of the solar energy battery,l comprising an electric phase metal powder, a glass phase and an organic phase; the present invention is provided with zero point zero five to one percent additive on base of the total weight of the conductive paste; the additive is TiO2 powder or SnO2 powder. The front electrode of the solar energy battery adopts the conductive paste, so the present invention not only enhances the peeling mechanical intensity of the front electrode of the battery, but also enhances the filling factor FF of the battery, reduces the resistance in series and enhances the light conversion efficiency; and the present invention makes the battery have a good balance of the synthesis electric capability and the mechanical capability.

Description

technical field [0001] The invention relates to a conductive paste for front electrodes of solar cells. Background technique [0002] In the solar cell manufacturing process, it is necessary to + An ohmic contact electrode is formed on the type semiconductor. There are two methods for forming ohmic contact electrodes, one is to use vacuum evaporation method, and the other is to use screen printing method. In order to reduce the production cost of solar cells and realize industrialization and large-scale production, screen printing methods are generally used. [0003] The screen printing method is used to prepare the front electrode of the solar cell by using a thick film conductive paste, coating it on the silicon substrate, drying it, and then sintering it in an infrared sintering furnace to make it metallized to form an electrode. [0004] The conductive paste for screen printing consists of conductive phase, glass phase and organic carrier phase. The conductive phase ...

Claims

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Application Information

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IPC IPC(8): H01L31/0224
Inventor 杨云霞郑建华张亚萍丁丽华曾惠丹陈国荣
Owner EAST CHINA UNIV OF SCI & TECH
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