Conductive paste and solar cell

Patent metadata

Field	Value
Publication number	US-11049983-B2
Application number	US-201716323762-A
Country	US
Kind code	B2
Filing date	Jul 12, 2017
Priority date	Aug 23, 2016
Publication date	Jun 29, 2021
Grant date	Jun 29, 2021

Abstract

Provided is a conductive paste for forming bus bar electrodes having high adhesive strength with respect to a passivation film in a crystalline silicon solar cell without having a detrimental effect on the passivation film so as to affect solar cell properties.
The conductive paste is a conductive paste formed on a passivation film of a solar cell, containing: (A) silver particles, (B) an organic vehicle, and (C) glass fit containing TeO 2 at 1.0 mol % to 20 mol % and Bi 2 O 3 at 10 mol % to 30 mol %.

First claim

The invention claimed is:

1. A conductive paste for forming an electrode on a passivation film of a solar cell, the conductive paste comprising:
(A) silver particles,
(B) an organic vehicle, and
(C) a glass frit comprising TeO 2 at 1.0 mol % to 9.6 mol %, Bi 2 O 3 at 10 mol % to 30 mol %, and SiO 2 at 5 mol % to 30 mol %,
wherein the glass frit (C) does not contain PbO.

2. The conductive paste according to claim 1 , wherein the specific surface area of the silver particles (A) is 0.4 m 2 /g to 1.5 m 2 /g.

3. The conductive paste according to claim 1 , wherein the organic vehicle (B) comprises at least one of ethyl cellulose, rosin ester, butyral, acrylic and organic solvent.

4. The conductive paste according to claim 1 , wherein the glass frit (C) further comprises ZnO at 10 mol % to 30 mol %.

5. The conductive paste according to claim 1 , wherein the glass frit (C) further comprises Al 2 O 3 at 1 mol % to 10 mol %.

6. The conductive paste according to claim 1 , wherein the glass frit (C) further comprises TiO 2 at 1 mol % to 20 mol %.

7. The conductive paste according to claim 1 , comprising at least one additive selected from titanium resinate, titanium oxide, cobalt oxide, cerium oxide, silicon nitride, copper-manganese-tin, aluminosilicate and aluminum silicate.

8. The conductive paste according to claim 1 , wherein the conductive paste is a conductive paste for forming back side TAB electrodes.

9. A solar cell in which electrodes are formed using the conductive paste according to claim 1 .

10. The solar cell according to claim 9 , wherein the specific surface area of the silver particles (A) in the conductive paste is 0.4 m 2 /g to 1.5 m 2 /g.

11. The solar cell according to claim 9 , wherein the organic vehicle (B) in the conductive paste comprises at least one of ethyl cellulose, rosin ester, butyral, acrylic and organic solvent.

12. The solar cell according to claim 9 , wherein the glass frit (C) in the conductive paste further comprises ZnO at 10 mol % to 30 mol %.

13. The solar cell according to claim 9 , wherein the glass frit (C) in the conductive paste further comprises Al 2 O 3 at 1 mol % to 10 mol %.

14. The solar cell according to claim 9 , wherein the glass frit (C) in the conductive paste further comprises TiO 2 at 1 mol % to 20 mol %.

15. The solar cell according to claim 9 , wherein the conductive paste comprises at least one additive selected from titanium resinate, titanium oxide, cobalt oxide, cerium oxide, silicon nitride, copper-manganese-tin, aluminosilicate and aluminum silicate.

16. The solar cell according to claim 9 , wherein the electrodes are back side TAB electrodes of the solar cell.

17. A conductive paste for forming an electrode on a passivation film of a solar cell, the conductive paste comprising:
(A) silver particles,
(B) an organic vehicle, and
(C) glass frit comprising TeO 2 at 1.0 mol % to 9.6 mol %, Bi 2 O 3 at 10 mol % to 30 mol % and SiO 2 at 5 mol % to 30 mol %,
wherein the glass frit (C) consists of at least three oxides, the at least three oxides including TeO 2 , Bi 2 O 3 , and SiO 2 , and optionally including one or more of TiO 2 , ZnO, Al 2 O 3 , B 2 O 3 , WO 3 , BaO, Ag 2 O and MoO 3 .

Assignees

• Namics Corp

Inventors

• Konno Seiya
• Sakai Noriyuki

Classifications

• H10W72/701

  Tape-automated bond [TAB] connectors · CPC title

• H10P14/46

  using a liquid · CPC title

• H10F77/211 Primary

  for photovoltaic cells · CPC title

• H10F77/16

  Material structures, e.g. crystalline structures, film structures or crystal plane orientations · CPC title

• H10F77/311

  for photovoltaic cells · CPC title