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Conductive paste and solar cell

A technology of solar cells and conductive paste, applied in the field of solar cells, can solve the problems of low line resistance, increased line resistance, difficulty in obtaining high conversion efficiency solar cells, etc., and achieves low line resistance, high energy conversion efficiency, and battery characteristics. good effect

Active Publication Date: 2017-12-05
HERAEUS PRECIOUS METALS NORTH AMERICA CONSHOHOCKEN
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0023] However, in this case, since the line resistance of the light-receiving surface electrode increases, it becomes difficult to obtain a solar cell with the desired high conversion efficiency.
[0024] In addition, in Patent Document 2, the reduction of contact resistance is achieved by adding Te and Se in addition to the glass frit. If it is contained, the line resistance cannot be sufficiently low, and like Patent Document 1, it is difficult to obtain a solar cell with a desired high conversion efficiency.

Method used

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  • Conductive paste and solar cell
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  • Conductive paste and solar cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0085] 〔Sample making〕

[0086] (Production of conductive paste)

[0087] Prepare TeO as a glass material 2 、 Bi 2 o 3 , ZnO, Al 2 o 3 , ZrO 2 , SiO 2 , B 2 o 3 , BaO, MoO 3 , La 2 o 3 , these glass materials were weighed so that the compounding quantities shown in Table 1 were prepared, and the glass frits of sample numbers 1-14 were produced.

[0088] [Table 1]

[0089]

[0090] In addition, spherical Ag powder having an average particle diameter of 1.6 μm was prepared as a conductive powder.

[0091] Next make the organic vehicle. That is, ethyl cellulose resin and ester alcohol were mixed so that the ethyl cellulose resin was 10 wt% as a binder resin and the ester alcohol was 90 wt% as an organic solvent to prepare an organic vehicle.

[0092] Then, according to the method of 86.0wt% of Ag powder and 3.0wt% of glass powder, they are mixed with rheology modifiers such as fatty acid amides and fatty acids, and organic vehicles. After mixing with a planetary...

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Abstract

The present invention relates to a conductive paste and a solar cell. The conductive paste contains a conductive powder, including at least a silver powder, a glass frit composed mainly of Te, Bi and Zn, and an organic vehicle. The total molar quantity of the three components of Te, Bi and Zn contained in the glass frit is, in terms of oxide, set at 95 mol% or more. Light-receiving surface electrodes (3) are formed by using the above-conductive paste. Thereby, a conductive paste suitable for forming solar cell electrodes is achieved, the conductive paste being capable of reducing both of the contact resistance between the electrodes and the semiconductor substrate, and the line resistance of the electrodes, while being lead free. Furthermore, a solar cell having high energy conversion efficiency and excellent battery characteristics is achieved as a result of using the conductive paste.

Description

technical field [0001] The present invention relates to a conductive paste and a solar cell. More specifically, it relates to a conductive paste suitable for electrode formation of a solar cell, and a solar cell manufactured using the conductive paste. Background technique [0002] In a solar cell, light-receiving surface electrodes having a predetermined pattern are generally formed on one main surface of a semiconductor substrate. In addition, an antireflection film is formed on the semiconductor substrate other than the light-receiving surface electrode, and the reflection loss of incident sunlight is suppressed by the antireflection film, thereby improving conversion efficiency of sunlight into electric energy. [0003] The light-receiving surface electrode is usually formed as follows using a conductive paste. That is, the conductive paste contains conductive powder, glass frit, and an organic vehicle, and the conductive paste is applied on the surface of an antireflec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/22H01L31/0224
CPCC03C3/062C03C3/122C03C3/125C03C3/14C03C8/04C03C8/18C08L1/28H01B1/22H01L31/022425Y02E10/547
Inventor 竹井正道
Owner HERAEUS PRECIOUS METALS NORTH AMERICA CONSHOHOCKEN
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