# US 8,771,554 B2 · Thick film silver paste containing Al2O3 and lead-tellurium—oxide and its use in the manufacture of semiconductor devices

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- Number: US 8,771,554 B2
- Document ID: US8771554B2
- Status: Granted
- Kind: B2
- Application number: 13/623,238
- Filed: 2012-09-20
- Published: 2013-04-25
- Granted: 2014-07-08
- Earliest claimed: 2011-10-20
- Assignees: E. I. Du Pont de Nemours and Company
- Applicants: E I du Pont de Nemours and Company
- Inventors: Raj G. Rajendran
- Web page: https://patentgrep.com/patent/US8771554B2

## CPC

- H01B 1/22: the conductive material comprising metals or alloys
- H10F 77/211: {for photovoltaic cells}
- Y02E 10/50: Photovoltaic [PV] energy
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- H10F: INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

The present invention is directed to a thick film silver paste comprising (i) silver, (ii) Al2O3, and (iii) a Pb—Te—O all dispersed in an organic medium. The present invention is further directed to an electrode formed from the paste and a semiconductor device and, in particular, a solar cell comprising such an electrode. The electrodes provide good adhesion and good electrical performance.

## Claims

### Claim 1

A thick film silver paste comprising:
(a) silver;
(b) Al2O3;
(c) a Pb—Te—O; and
(d) organic medium;
wherein said silver, said Al2O3, and said Pb—Te—O are dispersed in said organic medium, wherein said Al2O3 is present in an amount of 5-50 vol % based on the total volume of said silver and said Al2O3.

### Claim 2 (depends on 1)

The thick film silver paste of claim 1, wherein the total content of said silver, said Al2O3 and said Pb—Te—O is 50 to 95 wt %, based on the total weight of the paste.

### Claim 3 (depends on 2)

The thick film silver paste of claim 2, said thick film paste comprising 50-95 vol % silver, wherein said vol % is based on the total volume of said silver and said Al2O3.

### Claim 4 (depends on 3)

The thick film silver paste of claim 3, said thick film paste comprising 70-90 vol % silver and 10-30 vol % Al2O3, wherein said vol % are based on the total volume of said silver and said Al2O3.

### Claim 5 (depends on 3)

The thick film silver paste of claim 3, said thick film paste comprising 50-60 vol % silver and 40-50 vol % Al2O3, wherein said vol % are based on the total volume of said silver and said Al2O3.

### Claim 6 (depends on 1)

The thick film silver paste of claim 1, said thick film paste comprising 0.5-10 wt % Pb—Te—O, wherein said wt % is based on the total weight of said thick film paste.

### Claim 7 (depends on 6)

The thick film silver paste of claim 6, said Pb—Te—O comprising a Pb—Te—Li—O.

### Claim 8 (depends on 6)

The thick film silver paste of claim 6, said Pb—Te—O comprising a Pb—Te—LI—Ti—O.

### Claim 9 (depends on 6)

The thick film silver paste of claim 6, said Pb—Te—O comprising a Pb—Te—B—O.

### Claim 10 (depends on 6)

The thick film silver paste of claim 6, said thick film paste comprising 0.5-0.5 wt % Pb—Te—O, wherein said wt % is based on the total weight of said composition.

### Claim 11 (depends on 10)

The thick film silver paste of claim 10, said Pb—Te—O comprising a Pb—Te—Li—O.

### Claim 12 (depends on 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11)

A solar cell comprising an electrode formed from the thick film silver paste of any of claims 1-11, wherein said thick film paste has been fired to remove the organic medium and form said electrode.

### Claim 13

A solar cell comprising an electrode formed from the thick film silver paste comprising:
a) silver;
b) Al2O3;
c) Pb—Te—O; and
d) organic medium;
wherein said silver, said Al2O3, and said Pb—Te—O are dispersed in said organic medium and wherein said thick film paste has been fired to remove the organic medium and form said electrode, wherein said Al2O3 is present in an amount of 5-50 vol % based on the total volume of said silver and said Al2O3.

### Claim 14 (depends on 13)

The solar cell of claim 13, said Pb—Te—O comprising a Pb—Te—Li—O.