Composition for solar cell electrodes and electrode fabricated using the same

Patent metadata

Field	Value
Publication number	US-9741876-B2
Application number	US-201514692185-A
Country	US
Kind code	B2
Filing date	Apr 21, 2015
Priority date	Dec 17, 2013
Publication date	Aug 22, 2017
Grant date	Aug 22, 2017

Abstract

A composition for solar cell electrodes includes a silver powder; a glass frit; and an organic vehicle, wherein the glass frit includes bismuth (Bi), tellurium (Te), and chromium (Cr).

First claim

What is claimed is:

1. A composition for solar cell electrodes, comprising:
a silver powder;
an organic vehicle; and
a glass fit that includes bismuth (Bi), tellurium (Te), and chromium (Cr), Te being the predominant metal in the glass frit in terms of wt % of the metal oxide
wherein the glass frit includes lead oxide in an amount of 0 to 14.5 wt %.

2. The composition as claimed in claim 1 , wherein the glass frit further includes at least one element selected from lithium (Li), zinc (Zn), tungsten (W), phosphorus (P), silicon (Si), magnesium (Mg), cesium (Ce), strontium (Sr), molybdenum (Mo), titanium (Ti), tin (Sn), indium (In), vanadium (V), barium (Ba), nickel (Ni), copper (Cu), sodium (Na), potassium (K), antimony (Sb), germanium (Ge), gallium (Ga), calcium (Ca), arsenic (As), cobalt (Co), zirconium (Zr), manganese (Mn), aluminum (Al), and boron (B).

3. The composition as claimed in claim 1 , wherein the glass frit is prepared from a mixture of metal oxides including about 5 wt % to about 30 wt % of bismuth oxide, about 40 wt % to about 80 wt % of tellurium oxide, about 1 wt % to about 15 wt % of chromium oxide, and about 1 wt % to about 50 wt % of a fourth metal oxide.

4. The composition as claimed in claim 3 , wherein the fourth metal oxide includes at least one metal oxide selected from lead (Pb), lithium (Li), zinc (Zn), tungsten (W), phosphorus (P), silicon (Si), magnesium (Mg), cesium (Ce), strontium (Sr), molybdenum (Mo), titanium (Ti), tin (Sn), indium (In), vanadium (V), barium (Ba), nickel (Ni), copper (Cu), sodium (Na), potassium (K), antimony (Sb), germanium (Ge), gallium (Ga), calcium (Ca), arsenic (As), cobalt (Co), zirconium (Zr), manganese (Mn), aluminum (Al), and boron (B) oxides.

5. The composition as claimed in claim 3 , wherein the fourth metal oxide includes about 1 wt % to about 10 wt % of lithium oxide, about 1 wt % to about 10 wt % of zinc oxide, and about 1 wt % to about 10 wt % of tungsten oxide based on the total weight of the mixture of metal oxides.

6. The composition as claimed in claim 1 , including:
about 60 wt % to about 95 wt % of the silver powder;
about 0.5 wt % to about 20 wt % of the glass frit; and
about 1 wt % to about 30 wt % of the organic vehicle.

7. The composition as claimed in claim 1 , wherein the glass fit has an average particle diameter (D50) of about 0.1 μm to about 10 μm.

8. The composition as claimed in claim 1 , further comprising at least one additive selected from a dispersant, a thixotropic agent, a plasticizer, a viscosity stabilizer, an anti-foaming agent, a pigment, a UV stabilizer, an antioxidant, and a coupling agent.

9. The composition as claimed in claim 1 , wherein the organic vehicle includes a binder resin, the binder resin having a weight average molecular weight (Mw) of about 30,000 g/mol to about 200,000 g/mol.

10. The composition as claimed in claim 1 , wherein the composition has a viscosity of about 100,000 cps to about 500,000 cps.

11. A solar cell electrode fabricated using the composition for solar cell electrodes as claimed in claim 1 .

Assignees

• Samsung Sdi Co Ltd

Inventors

• Jung Seok Hyun
• Park Young Ki
• Kim Dong Suk
• Kim Ju Hee
• Park Min Su
• Kim Koon Ho
• Kim Min Jae
• Kim Seak Cheol
• Yang Sang Hyun

Classifications

• H01L31/022425 Primary

  Electricity · mapped topic

• H05K1/092

  Dispersed materials, e.g. conductive pastes or inks · CPC title

• H01B1/22

  the conductive material comprising metals or alloys · CPC title

• C03C8/04

  containing zinc · CPC title

• C09D5/24

  Electrically-conducting paints {(conductive materials H01B1/00)} · CPC title