Paste for solar cell electrode, solar cell electrode manufacturing method, and solar cell

Abstract

The present invention pertains to an electroconductive paste for a solar cell electrode, which includes a first silver powder with a crystallite size of 58 nm, a second silver powder with a different crystallite size from that of the first silver powder, glass frit, and resin binder. The present invention also provides a solar cell having an electrode containing the aforementioned electroconductive paste.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1( a)-(d) explain the manufacturing process when manufacturing a solar cell using the electroconductive paste of the present invention.

FIG. 2 is a diagram illustrating the results of measuring the electrical characteristics of the solar cells manufactured when the contents of the first and second silver powders are varied, in order to estimate the best contents of the silver powders.

Claims

1. A paste containing: a first silver powder with a crystallite size of 58 nm or larger,a second silver powder having a different crystallite size from that of the first silver powder,a glass frit, anda resin binder, wherein the paste is useful in the manufacture of a solar cell electrode.

2. The paste of claim 1, wherein the first silver powder is manufactured using the atomization method.

3. The paste of claim 1, wherein the shrinkage starting temperature of the first silver powder is 700° C. or higher.

4. The paste of claim 1, wherein the first silver powder is 10-70 wt %, based on the total weight of the first silver and second silver.

5. The paste of claim 1, wherein the crystallite size of the first silver powder is in the range of 58-90 nm, and wherein the crystallite size of the second silver paste is in the range of 30-58 nm.

6. A solar cell having an electrode comprising a first silver powder with a crystallite size of 58 nm or larger, a second silver powder having a different crystallite size from that of the first silver powder, and a glass frit.

7. The solar cell of claim 6, wherein the first silver powder is manufactured using the atomization method.

8. The solar cell of claim 6, wherein the shrinkage-starting temperature of the first silver powder is 700° C. or higher.

9. The solar cell of claim 6, wherein the content of the first silver powder is in the range of 10-70 wt % based on the total weight of the silver.

10. The solar cell of claim 6, wherein the crystallite size of the first silver powder is in the range of 58-90 nm, and wherein the crystallite size of the second silver paste is in the range of 30-58 nm.