Conductive paste, method for producing same, and method for producing solar cell

Patent metadata

Field	Value
Publication number	US-10833209-B2
Application number	US-201716330878-A
Country	US
Kind code	B2
Filing date	Sep 5, 2017
Priority date	Sep 8, 2016
Publication date	Nov 10, 2020
Grant date	Nov 10, 2020

Abstract

A conductive paste including: a conductive powder containing silver; an indium powder; a silver-tellurium-coated glass powder; a solvent; and an organic binder, wherein the silver-tellurium-coated glass powder is a silver-tellurium-coated glass powder including a tellurium-based glass powder containing tellurium in an amount of 20% by mass or more, and a coating layer on a surface of the tellurium-based glass powder, the coating layer containing silver and tellurium as a main component.

First claim

The invention claimed is:

1. A conductive paste comprising:
a conductive powder containing silver;
an indium powder;
a silver-tellurium-coated glass powder;
a solvent; and
an organic binder,
wherein the silver-tellurium-coated glass powder is a silver-tellurium-coated glass powder including a tellurium-based glass powder containing tellurium in an amount of 20% by mass or more, and a coating layer on a surface of the tellurium-based glass powder, the coating layer containing silver and tellurium as a main component.

2. The conductive paste according to claim 1 , wherein an amount of the indium powder with respect to a mass of tellurium contained in the silver-tellurium-coated glass powder is in a range of 0.05 to 0.5 in terms of a mass of indium/(the mass of indium+the mass of tellurium in the silver-tellurium-coated glass powder).

3. The conductive paste according to claim 1 , wherein the tellurium-based glass powder contains at least one selected from the group consisting of zinc, lead, bismuth, silicon, and aluminum.

4. A method for producing a conductive paste, the method comprising:
adding to a silver complex solution, a tellurium-based glass powder containing tellurium in an amount of 20% by mass or more, and then adding a reducing agent to form on a surface of the tellurium-based glass powder, a coating layer containing silver and tellurium as a main component, to thereby obtain a silver-tellurium-coated glass powder; and
mixing the silver-tellurium-coated glass powder, a conductive powder containing silver, an indium powder, a solvent, and an organic binder.

5. A method for producing a solar cell, the method comprising:
printing or coating the conductive paste according to claim 1 on an anti-reflection layer, and firing.

Assignees

• Dowa Electronics Materials Co Ltd

Inventors

• Harigae Kenichi
• Kamiga Hiroshi
• Nogami Noriaki

Classifications

• B22F1/10

  Metallic powder containing lubricating or binding agents; Metallic powder containing organic material · CPC title

• B22F1/103

  containing an organic binding agent comprising a mixture of, or obtained by reaction of, two or more components other than a solvent or a lubricating agent · CPC title

• B22F1/18

  Non-metallic particles coated with metal · CPC title

• H10F71/00

  Manufacture or treatment of devices covered by this subclass (patterning processes to connect thin photovoltaic cells in integrated devices, or assemblies of multiple devices, having photovoltaic cells H10F19/33; manufacture or treatment of encapsulations or containers for integrated devices, or assemblies of multiple devices, having photovoltaic cells H10F19/80; manufacture or treatment of integrated devices, or assemblies of multiple devices, comprising at least one element in which radiation controls the flow of current H10F39/00) · CPC title

• H10F77/211

  for photovoltaic cells · CPC title