# US 2014/0150867 A1 · Fusion Formable Silica and Sodium Containing Glasses

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- Number: US 2014/0150867 A1
- Document ID: US20140150867A1
- Status: Published application
- Kind: A1
- Application number: 14/176,500
- Filed: 2014-02-10
- Published: 2014-06-05
- Earliest claimed: 2009-07-24
- Assignees: Corsam Technologies LLC
- Applicants: Corsam Technologies LLC
- Inventors: Bruce Gardiner AITKEN; James Edward Dickinson, JR.; Timothy J. Kiczenski
- Web page: https://patentgrep.com/patent/US20140150867A1

## CPC

- H10F 77/14: Shape of semiconductor bodies; Shapes, relative sizes or dispositions of semiconductor regions within semiconductor bodies
- C03C 3/085: containing an oxide of a divalent metal
- C03C 3/087: containing calcium oxide, e.g. common sheet or container glass
- C03C 3/091: containing aluminium
- H10F 77/1694: {the films including Group I-III-VI materials, e.g. CIS or CIGS}
- Y02E 10/541: CuInSe2 material PV cells
- Y02E 10/543: Solar cells from Group II-VI materials
- H10F: INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

Sodium containing aluminosilicate and boroaluminosilicate glasses are described herein. The glasses can be used as substrates or superstrates for photovoltaic devices, for example, thin film photovoltaic devices such as CIGS photovoltaic devices. These glasses can be characterized as having strain points ≧535° C., for example, ≧570° C., thermal expansion coefficients of from 8 to 9 ppm/° C., as well as liquidus viscosities in excess of 50,000 poise. As such they are ideally suited for being formed into sheet by the fusion process.

## Claims

### Claim 1

A glass consisting essentially of in weight percent:
50 to 72 percent SiO2;
greater than 15 to 25% percent Al2O3;
0 to 10 percent B2O3;
10 to 25 percent total M2O; and
greater than 0 to 25 percent total RO;
wherein M is an alkali metal selected from Na, K, Li, Rb, and Cs, wherein the glass comprises at least 9 weight percent Na2O, wherein R is an alkaline earth metal selected from Mg, Ca, Ba, and Sr,
wherein the glass has a strain point of 535° C. or greater, a coefficient of thermal expansion of 50×10−7 or greater, and a liquidus viscosity of 130,000 poise or greater.

### Claim 2 (depends on 1)

The glass of claim 1, comprising 0-3 weight percent K2O.

### Claim 3 (depends on 1)

The glass of claim 1, substantially free of K2O.

### Claim 4 (depends on 1)

The glass of claim 1, comprising 0.5 to less than 14 weight percent RO.

### Claim 5 (depends on 1)

The glass of claim 1, comprising less than 2.5 weight percent MgO.

### Claim 6 (depends on 1)

The glass of claim 1, comprising 55 to 72 weight percent SiO2.

### Claim 7 (depends on 1)

The glass of claim 1, having a strain point of 560° C. or greater.

### Claim 8 (depends on 1)

The glass of claim 1, comprising 9 to 17 weight percent Na2O.

### Claim 9 (depends on 1)

The glass of claim 1, comprising no ZrO2.

### Claim 10 (depends on 1)

The glass of claim 1, consisting of SiO2, Al2O3, M2O, and RO.

### Claim 11 (depends on 1)

The glass of claim 1, consisting of SiO2, Al2O3, M2O, B2O3, and RO.

### Claim 12 (depends on 1)

The glass of claim 1, substantially free of BaO.

### Claim 13 (depends on 1)

The glass of claim 1, having a liquidus viscosity of 150,000 poise or greater, and a coefficient of thermal expansion of from 50×10−7 to 90×10−7.

### Claim 14 (depends on 1)

A photovoltaic device comprising a substrate or superstrate and an active photovoltaic medium adjacent to the substrate of superstrate, wherein the substrate or superstrate is in the form of a sheet comprising the glass composition of claim 1.

### Claim 15 (depends on 14)

The photovoltaic device of claim 14, wherein the active photovoltaic medium comprises copper indium gallium diselenide.

### Claim 16 (depends on 14)

The photovoltaic device of claim 14, wherein the active photovoltaic medium comprises cadmium telluride.