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Conductive paste and solar cell

A technology for solar cells and conductive paste, applied in the field of solar cells, can solve the problems of low contact resistance, dependence on contact resistance, and maintain low contact resistance, and achieve the effects of low contact resistance, high energy conversion efficiency, and good battery characteristics

Active Publication Date: 2015-07-22
HERAEUS PRECIOUS METALS NORTH AMERICA CONSHOHOCKEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] However, in Patent Document 1, although the contact resistance between the light-receiving surface electrode and the semiconductor substrate is lowered by using a conductive paste containing tellurium-based glass frit, the battery characteristics of the solar cell are improved, but the contact resistance depends on the glass. Composition of powder
That is, since the contact resistance is affected by tellurium oxide or other additives (tungsten oxide, molybdenum oxide, etc.), it is difficult to keep the contact resistance low stably

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0091] 〔Sample making〕

[0092] (Production of conductive paste)

[0093] Prepare TeO as a glass material 2 , ZnO, Bi 2 o 3 , Li 2 O, Na 2 O, K 2 O, MgO, CaO, SrO, BaO, MnO 2 , CuO, Ag 2 O.B 2 o 3 , V 2 o 5 ,P 2 o 5 、TiO 2 , Nb 2 o 5 , Fe 2 o 3 , CoO, NiO, Al 2 o 3 , ZrO 2 、 Ta 2 o 5 , SiO 2 , SnO 2 , Sb 2 o 5 , and MoO 3 . Then, these glass materials were weighed so that it might become the compounding quantity shown in Table 1, and it prepared, and the glass frit of sample numbers 1-26 was produced.

[0094] [Table 1]

[0095]

[0096] In addition, spherical Ag powder having an average particle diameter of 1.6 μm was prepared as the conductive powder.

[0097] Next, ethyl cellulose resin and ester alcohol were mixed so that 10 wt% of ethyl cellulose resin was used as a binder resin and 90 wt% of ester alcohol was used as an organic solvent to prepare an organic vehicle.

[0098] Then, the Ag powder becomes 86.0wt%, and the glass powder beco...

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Abstract

The conductive paste contains a conductive powder, a glass frit, and an organic vehicle. The glass frit contains 35-90 mol% of Te in terms of TeO 2 , 5-50 mol% of Zn in terms of ZnO, and 1-20 mol% of Bi in terms of Bi 2 O 3 , and contains 0.1-15 mol% of at least one element selected from the group of Li, Na, and K in terms of oxides thereof. The conductive paste is used to form light-receiving surface electrodes (3). A conductive paste appropriate for formation of electrodes of a solar cell capable of reducing contact resistance between the electrode (3) and a semiconductor substrate (1) is thereby achieved, the use of the conductive paste obtaining high energy conversion efficiency and attaining a solar cell having excellent cell characteristics.

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 using a conductive paste as follows. 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 Applications(China)
IPC IPC(8): H01L31/0224H01B1/22
CPCH01L31/022425H01B1/22C03C3/122C03C3/125C03C3/127C03C3/14C03C3/16C03C8/04C03C8/18Y02E10/547H01L31/04Y02E10/50
Inventor 竹井正道
Owner HERAEUS PRECIOUS METALS NORTH AMERICA CONSHOHOCKEN
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