Electroconductive thick film composition, electrode, and solar cell formed therefrom

a technology of electrodes and thick films, applied in the direction of non-metal conductors, conductors, organic conductors, etc., can solve the problem of difficult to obtain an electroconductive paste for connection

Inactive Publication Date: 2006-10-19
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the conventional electroconductive pastes, it was difficult to obtain an electroconductive paste for connection that suppresses the generation of cracks and that can form the second electrode having both a sufficient adhesive strength and that can maintain sufficient cell characteristics.

Method used

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  • Electroconductive thick film composition, electrode, and solar cell formed therefrom
  • Electroconductive thick film composition, electrode, and solar cell formed therefrom
  • Electroconductive thick film composition, electrode, and solar cell formed therefrom

Examples

Experimental program
Comparison scheme
Effect test

application example 1

[0069] Application Example 1 is detailed below.

Manufacture of Electroconductive Paste

[0070] 1.7 wt % of a viscosity adjustor and 22.5 wt % of an organic vehicle (terpineol solution of ethylcellulose (containing 20 parts ethylcellulose)) were added to a mixture of 4.8 wt % glass frit (Si-B-Pb-O system) and 71.0 wt % silver powder with an average particle diameter of 8.5 μm. This mixture was premixed by a universal mixer and kneaded by a three-roll kneader, so that a silver electroconductive paste was obtained. The particle diameter, content, and characteristics of the materials used are shown in FIG. 2.

Manufacture of Solar Cell

[0071] Using the silver electroconductive paste obtained, a solar cell was formed in the following sequence.

[0072] (1) On the back face of a Si substrate having a silver electrode on the surface, an aluminum paste PV333 for the back face electrode of a solar cell (commercially available from E. I. du Pont de Nemours and Company) was screen-printed at a d...

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Abstract

The electroconductive thick film paste of the present invention is a silver electroconductive paste, which includes silver particles, glass particles, and an organic vehicle, and is used in an electrode for connecting a back face terminal on the silicon substrate of a solar cell, and is characterized by the fact that the average particle diameter of said silver particles is 3.0-15.0 μm. The present invention is further directed to an electrode formed from the composition as detailed above and a solar cell comprising said electrode.

Description

FIELD OF THE INVENTION [0001] The present invention is directed to a silicon semiconductor device. In particular, it pertains to an electroconductive composition used in the formation of a thick film electrode of a solar cell. The present invention is further directed to a silver electroconductive thick film composition (paste) for a solar cell. TECHNICAL BACKGROUND OF THE INVENTION [0002] The present invention can be applied to a broad range of semiconductor devices, although it is especially effective in light-receiving elements such as photodiodes and solar cells. The background of the invention is described below with reference to solar cells as a specific example of the prior art. [0003] A conventional solar cell structure with a p-type base has a negative electrode that is typically on the front-side or sun side of the cell and a positive electrode on the backside. It is well-known that radiation of an appropriate wavelength falling on a p-n junction of a semiconductor body se...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01B1/12
CPCC03C8/10C03C8/18C03C14/006C03C2214/08Y02E10/50H01B1/22H01L31/022408H01L31/022425H05K1/092C03C2214/16H01L31/0224H01L31/04
Inventor KONNO, TAKUYA
Owner EI DU PONT DE NEMOURS & CO
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