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Paste composition for solar cell electrode

A technology for solar cells and compositions, applied in conductive materials dispersed in non-conductive inorganic materials, circuits, photovoltaic power generation, etc., can solve problems such as plate pollution, and achieve improved fluidity, excellent printing characteristics and good workability. Effect

Active Publication Date: 2014-02-12
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of printing a fine pattern through a screen plate or a metal plate with a small opening diameter, the plate contamination caused by the above-mentioned paste is serious, and there is still a problem that a high-definition wiring pattern or bump that satisfies the needs cannot be obtained.

Method used

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  • Paste composition for solar cell electrode
  • Paste composition for solar cell electrode

Examples

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Embodiment

[0113] The present invention will be specifically described below using Examples and Comparative Examples. In addition, the following examples do not limit the present invention in any way.

Synthetic example 1

[0115] [Synthesis of Hydrophobic Spherical Silica Microparticles]

[0116] ・Step (A1): Synthesis of hydrophilic spherical silica particles

[0117] 989.5 g of methanol, 135.5 g of water, and 66.5 g of 28% by mass ammonia water were placed in a 3-liter glass reactor equipped with a stirrer, a dropping funnel, and a thermometer, and mixed. It adjusted so that this solution might become 35 degreeC, and it dripped 436.5 g (2.87 mol) of tetramethoxysilanes over 6 hours, stirring. After completion of the dropping, stirring was continued for another 0.5 hour to conduct hydrolysis to obtain a suspension of hydrophilic spherical silica fine particles.

[0118] ・Step (A2): Surface treatment step using a trifunctional silane compound

[0119] In the suspension obtained above, 4.4 g (0.03 moles) of methyltrimethoxysilane was added dropwise at room temperature for 0.5 hours, and the stirring was continued for 12 hours after dropping to carry out hydrophobic treatment on the surface of th...

Embodiment 1

[0136] In Example 1, in step (A1), the amounts of methanol, water, and 28% by mass ammonia water were changed to 1,045.7 g of methanol, 112.6 g of water, and 33.2 g of 28% by mass ammonia water, and hydrophobic spherical silica was obtained in the same manner. Microparticles [2] 188g. Using the hydrophobic spherical silica fine particles, it was measured in the same manner as in Synthesis Example 1. The results are shown in Table 1.

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Abstract

Provided is a paste composition for a solar cell electrode, which is characterized by including a conductive powder body, glass material, an organic carrier, silicon dioxide made by hydrophobization of hydrophilic silicon dioxide which is obtained by the hydrolysis and condensation of tetrafunctional silicohydride compounds or part of hydrolysis products or their mixture, and the bulk specific weight of the silicon dioxide is more than 300g / L. According to the invention, by adding the special silicon dioxide to a conductive paste, the paste composition for the solar cell electrode is improved in flowability during the mixing, excellent in working, and excellent in printing property.

Description

technical field [0001] The present invention relates to a conductive paste composition for electrodes of solar cells. Background technique [0002] A solar cell that converts light energy such as sunlight into electric energy has been actively developed with various structures and configurations in response to increasing interest in global environmental issues. Among them, a solar cell using a semiconductor substrate such as silicon is most commonly used due to its advantages in conversion efficiency, manufacturing cost, and the like. [0003] Resin-based paste materials are known as materials for forming electrodes of such solar cells. For example, Patent Document 1 (Japanese Unexamined Patent Publication No. 2004-146154) describes "paste for silver electrodes, which is characterized in that it contains at least silver powder, glass frit, resin and organic solvent, and the glass frit is made of a paste with an opening diameter of 24 to 100 μm. Residue from sieve classific...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/16H01B1/22C01B33/113H01L31/0224
CPCY02E10/52Y02E10/50C03C8/14H01B1/08H01B1/20H01L31/022425H01L31/042
Inventor 松村和之坂诘功晃
Owner SHIN ETSU CHEM IND CO LTD
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