Electro-conductive paste, solar cell and method for producing solar cell

Patent metadata

Field	Value
Publication number	US-10770601-B2
Application number	US-201615579815-A
Country	US
Kind code	B2
Filing date	Jun 3, 2016
Priority date	Jun 17, 2015
Publication date	Sep 8, 2020
Grant date	Sep 8, 2020

Abstract

An electro-conductive paste which includes an electro-conductive powder, a multiple oxide containing tellurium oxide, and an organic vehicle. The electro-conductive paste contains 0.1 parts by weight to 10 parts by weight of the multiple oxide based on 100 parts by weight of the electro-conductive powder, and the content ratio of the tellurium oxide in 100% by weight of the multiple oxide as TeO 2 is 3% by weight to 30% by weight.

First claim

The invention claimed is:

1. An electro-conductive paste set for use with solar cells comprising an electro-conductive paste for forming a bus bar electrode and an electro-conductive paste for forming a finger electrode, wherein:
the electro-conductive paste for forming a bus bar electrode comprises an electro-conductive powder, a multiple oxide containing tellurium oxide, and an organic vehicle, wherein the electro-conductive paste contains 0.1 parts by weight to 10 parts by weight of the multiple oxide based on 100 parts by weight of the electro-conductive powder, and wherein a content ratio of the tellurium oxide in 100% by weight of the multiple oxide as TeO 2 is 3% by weight to 30% by weight,
the electro-conductive paste for forming a finger electrode contains an electro-conductive powder, a multiple oxide in an amount of 0.1 parts by weight to 10 parts by weight based on 100 parts by weight of the electro-conductive powder, and an organic vehicle, and
a content ratio of tellurium oxide in the multiple oxide in the electro-conductive paste for forming the finger electrode is higher than a content ratio of tellurium oxide in the multiple oxide in the electro-conductive paste for forming the bus bar electrode.

2. The electro-conductive paste set according to claim 1 , wherein the content ratio of tellurium oxide in the multiple oxide of the electro-conductive paste for forming the finger electrode as TeO 2 is 25% by weight to 75% by weight.

3. A method for producing a crystalline silicon solar cell, the method comprising:
printing each of the electro-conductive paste for a bus bar electrode and the electro-conductive paste for a finger electrode of the electro-conductive paste set according to claim 1 on an impurity diffusion layer of a crystalline silicon substrate or on an antireflective film on an impurity diffusion layer; and
forming a bus bar electrode and a finger electrode by drying and firing the printed electro-conductive pastes.

4. The method for producing a crystalline silicon solar cell according to claim 3 , wherein the printing the electro-conductive paste comprises:
printing the electro-conductive paste for a finger electrode on the impurity diffusion layer of the crystalline silicon substrate or the antireflective film on the impurity diffusion layer, so as to serve as a pattern of the finger electrode; and
printing the electro-conductive paste for a bus bar electrode on the impurity diffusion layer of the crystalline silicon substrate or the antireflective film on the impurity diffusion layer so as to serve as a pattern of the bus bar electrode.

5. The method for producing a crystalline silicon solar cell according to claim 3 , wherein the printing the electro-conductive paste comprises:
printing the electro-conductive paste for a finger electrode on the impurity diffusion layer of the crystalline silicon substrate or on the antireflective film on the impurity diffusion layer so as to serve as a pattern of the finger electrode; and
printing the electro-conductive paste for a bus bar electrode on the impurity diffusion layer of the crystalline silicon substrate or the antireflective film on the impurity diffusion layer so as to serve as a pattern of the finger electrode and the bus bar electrode, in that order.

6. The electro-conductive paste set according to claim 1 , wherein the multiple oxide in the electro-conductive paste for forming a bus bar electrode further contains at least one oxide selected from the group consisting of Bi 2 O 3 and PbO.

7. The electro-conductive paste set according to claim 6 , wherein a total content of Bi 2 O 3 and PbO in 100% by weight of the multiple oxide in the electro-conductive paste for forming a bus bar electrode is 50% by weight to 97% by weight.

8. The electro-conductive paste set according to claim 7 , wherein a content ratio of PbO in 100% by weight of the multiple oxide in the electro-conductive paste for forming a bus bar electrode is 5% by weight to 30% by weight.

9. The electro-conductive paste set according to claim 7 , wherein a content ratio of Bi 2 O 3 in 100% by weight of the multiple oxide in the electro-conductive paste for forming a bus bar electrode is 30% by weight to 80% by weight.

10. The electro-conductive paste set according to claim 6 , wherein the multiple oxide in the electro-conductive paste for forming a bus bar electrode further comprises at least one oxide selected from the group consisting of SiO 2 , B 2 O 3 , Li 2 O, Na 2 O, K 2 O, MgO, CaO, BaO, SrO, ZnO, Al 2 O 3 , TiO 2 and ZrO 2 .

11. The electro-conductive paste set according to claim 1 , wherein the electro-conductive powder in the electro-conductive paste for forming a bus bar electrode is a silver powder.

Assignees

• Namics Corp

Inventors

• Konno Seiya

Classifications

• H10P14/46

  using a liquid · CPC title

• H10F77/121

  comprising only selenium or only tellurium · CPC title

• H10F77/211 Primary

  for photovoltaic cells · CPC title

• C03C3/074

  containing zinc · CPC title

• C03C8/14

  Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill-additions · CPC title