Method of manufacturing solar cell electrode

Patent metadata

Field	Value
Publication number	US-9246027-B2
Application number	US-201414280767-A
Country	US
Kind code	B2
Filing date	May 19, 2014
Priority date	May 31, 2013
Publication date	Jan 26, 2016
Grant date	Jan 26, 2016

Abstract

A method of manufacturing a solar electrode comprising steps of:(a) stencil printing a conductive paste onto a front side of a semiconductor substrate through a printing mask comprising: (i) 60 wt % to 95 wt % of a conductive powder, (ii) 0.1 wt % to 10 wt % of glass frit, (iii) 3 wt % to 30 wt % of an organic medium, (iv) 0.4 wt % to 1.7 wt % of an amide compound, based on the total weight of the conductive paste and (b) firing the applied conductive paste to form an electrode.

First claim

We claim:

1. A method of manufacturing a solar electrode comprising steps of:
(a) stencil printing a conductive paste onto a front side of a semiconductor substrate through a printing mask, the conductive paste comprising:
(i) 60 wt % to 95 wt % of a conductive powder,
(ii) 0.1 wt % to 10 wt % of a glass frit,
(iii) 3 wt % to 30 wt % of an organic medium,
(iv) 0.4 wt % to 1.7 wt % of an amide compound, based on the total weight of the conductive paste; and

(b) firing the applied conductive paste to form an electrode
wherein the amide compound is a fatty acid diamide represented by the formula: R′—CO—NH—R″—NH—CO—R′, wherein R′ independently represents an substituted or unsubstituted aliphatic chain of a fatty acid, and R″ represents an substituted or unsubstituted alkylene group.

2. The method of claim 1 , wherein the glass frit is a lead-tellurium-boron-oxide.

3. The method of claim 1 , wherein the width of the electrode is 20 to 60 μm and the height of the electrode is 10 to 35 μm.

4. The method of claim 1 , wherein the aspect ratio (height/width) of the electrode is 0.3 to 0.6.

5. The method of claim 1 , wherein the peak temperature in the firing step is 600 to 900° C.

6. The method of claim 1 , wherein the printing mask is a metal mask.

7. The method of claim 1 , wherein the viscosity of the conductive paste is 350 to 1000 Pa·s.

Assignees

• Du Pont

Inventors

• Ito Kazushige
• Yang Jean

Classifications

• H10F10/14

  Photovoltaic cells having only PN homojunction potential barriers · CPC title

• H10F77/211 Primary

  for photovoltaic cells · CPC title

• H01B1/22

  the conductive material comprising metals or alloys · CPC title

• H01L31/068

  Electricity · mapped topic

• H01L31/022425 Primary

  Electricity · mapped topic