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Composition for forming solar cell electrode, and electrode produced from composition

A solar cell and composition technology, which is applied to conductive materials, circuits, electrical components and other directions dispersed in non-conductive inorganic materials, can solve problems such as difficulty in printing patterns, and achieve the effect of high aspect ratio

Active Publication Date: 2015-09-09
上海匠聚新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is still difficult to print patterns with fine line width and high aspect ratio

Method used

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  • Composition for forming solar cell electrode, and electrode produced from composition
  • Composition for forming solar cell electrode, and electrode produced from composition
  • Composition for forming solar cell electrode, and electrode produced from composition

Examples

Experimental program
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specific Embodiment approach

[0055] In the following exemplary embodiments, each component of the present invention will be described in more detail. However, the exemplary embodiments are provided for understanding of the present invention and are not limited to the following embodiments. Other details not described in this application can be easily deduced by those skilled in the art, so they are omitted.

[0056] Composition for Solar Cell Electrodes

[0057] The solar cell electrode composition according to the present invention includes conductive powder (A), glass frit (B), organic vehicle (C) and thixotropic agent (D), and can be printed in a fine line width by screen printing Printed on the substrate, and has high conversion efficiency.

[0058] Now, each component of the solar cell electrode composition according to the present invention will be described in more detail.

[0059] (A) Conductive powder

[0060] As the conductive powder, any organic or inorganic powder having conductivity can b...

example 1

[0110] For the organic binder, 0.7wt% ethylcellulose (STD4, SDT200, Dow Chemical Company) was fully dissolved in 3.3wt% ester alcohol (Texanol) at 60°C to An organic vehicle was prepared, and the average particle diameter was 88wt% spherical silver powder (AG-4-8, Dowa Hightech Co.Ltd) of 2.0 μm, 2.7wt% low melting point crystallized glass powder ( Pb-Bi-Te-O) (average particle size 1.0 μm, and transition point 280° C.) and 0.6 wt % dispersant BYK145 (BYK-Chemie) and 0.4 wt % thixatrol ST (Eminence Co., Ltd.) was added to the organic vehicle, followed by mixing and kneading in a 3-roll kneader to prepare a solar cell electrode composition.

[0111] The composition is printed in a preset pattern on the front surface of the wafer by screen printing. The properties of the composition were measured by the following methods, and the results are shown in Table 2.

example 2 to example 5 and comparative example 1 to comparative example 3

[0113] A composition for a solar cell electrode was prepared in the same manner as in Example 1 except that the amounts of the components for the composition listed in Table 2 were used. Hereinafter, the compositions were printed by screen printing.

[0114] property measurement

[0115] Measurement of Thixotropic Index (TI):

[0116] The thixotropic index was calculated using the ratio of the viscosity values ​​measured at 23° C. using a No. 14 spindle by a rotational viscometer HBDV-II+Pro (Brookfield Co., Ltd.). For viscosity measurements, the sample cup is filled with sample and the mandrel is configured. After the temperature was stabilized for 5 minutes, the viscosity was measured at the following holding time.

[0117] Table 1

[0118]

[0119] The thixotropic index in Formula 1 to Formula 4 and the rate of change of the thixotropic index in Formula 5 to Formula 7 were calculated based on the measured viscosity values. The results are shown in Table 2 and figur...

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Abstract

The present invention relates to a composition for forming a solar cell electrode which is characterized by including a conductive powder, a glass frit, an organic vehicle, and a thixotropic agent, and satisfying 3<TI 10=(viscosity at 1 rpm) / (viscosity at 10 rpm)<5.5, 4<TI 20=(viscosity at 2 rpm) / (viscosity at 20 rpm)<7, 6<TI 50=(viscosity at 5 rpm) / (viscosity at 50 rpm)<7.5, 6<TI 100=(viscosity at 10 rpm) / (viscosity at 100 rpm)<7.5, 1<¦TI 10-TI 20¦<2, 0.5<¦TI 20-TI 50¦<1.5, and 0<=¦TI 50-TI 100¦<0.8. Here, thixotropic index (TI) is a value calculated by substituting viscosity measured at each revolution (rpm) with a spindle number 14 by using a rotation viscometer at 23°C. The composition for forming a solar cell electrode can realize a print pattern having a fine line width and high aspect ratio, and has excellent conversion efficiency.

Description

technical field [0001] The present invention relates to a composition for solar cell electrodes and an electrode manufactured using the composition. More particularly, the present invention relates to a solar cell electrode composition which can be printed on a substrate with fine line width and high aspect ratio by screen printing and has high conversion efficiency, and The present invention relates to electrodes manufactured using the composition. Background technique [0002] A solar cell generates electricity using a pn junction photovoltaic effect (photovoltaic effect) that converts photons of sunlight into electricity. In a solar cell, a front electrode and a back electrode are respectively formed on an upper surface and a lower surface of a semiconductor wafer or substrate having a pn junction. Then, the photovoltaic effect at the pn junction is induced by sunlight entering the semiconductor wafer, and electrons generated by the photovoltaic effect at the pn junctio...

Claims

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Application Information

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IPC IPC(8): H01B1/20H01B1/22H01L31/0224
CPCY02E10/50H01B1/22H01L31/022425H01B1/16H01L31/042H10K10/82H01L31/18
Inventor 宋大燮金载昊梁相贤崔永郁
Owner 上海匠聚新材料有限公司
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