# US 9,040,814 B2 · Anti-reflective coating for photovoltaic cells

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- Number: US 9,040,814 B2
- Document ID: US9040814B2
- Status: Granted
- Kind: B2
- Application number: 13/776,154
- Filed: 2013-02-25
- Published: 2014-08-28
- Granted: 2015-05-26
- Earliest claimed: 2013-02-25
- Applicants: Emily Fucinato
- Inventors: Emily Fucinato
- Web page: https://patentgrep.com/patent/US9040814B2

## CPC

- H10F 77/315: {the coatings being antireflective or having enhancing optical properties}
- Y02E 10/50: Photovoltaic [PV] energy
- 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

A surface of a photovoltaic cell is coated with a solution that includes barium titanate to reduce reflection of sunlight that is incident on the surface. The solution may include a base of polydimethylsiloxane and carbon nanotubes. The process may be used in the fabrication of new photovoltaic cell assemblies, or to retrofit existing assemblies in situ.

## Claims

### Claim 1

A photovoltaic cell comprising:
a first surface; and
an anti-reflective coating placed on the first surface, wherein the anti-reflective coating comprises a matrix with barium titanate crystals having a variable index of refraction and carbon nanotubes dispersed within the matrix.

### Claim 2 (depends on 1)

A photovoltaic cell according to claim 1, wherein the carbon nanotubes comprise single walled carbon nanotubes.

### Claim 3 (depends on 1)

The photovoltaic cell of claim 1, wherein the matrixes comprises polydimethylsiloxane.

### Claim 4 (depends on 1)

The photovoltaic cell of claim 1, wherein the coating is fabricated using a solution that comprises greater than 100 mg of barium titanate per a 3 ml solution.

### Claim 5 (depends on 4)

The photovoltaic cell of claim 4, wherein the coating is fabricated using a solution that comprises greater than 140 mg of barium titanate per a 3 ml solution.

### Claim 6

A photovoltaic cell comprising:
a first surface; and
an anti-reflective coating placed on the first surface, wherein the anti-reflective coating comprises polydimethylsiloxane with barium titanate crystals having a variable index of refration and single walled carbon nanotubes dispersed within the polydimethylsiloxane.

### Claim 7 (depends on 6)

The photovoltaic cell of claim 6, wherein the coating is fabricated using a solution that comprises greater than 100 mg of barium titanate per a 3 ml solution.

### Claim 8 (depends on 7)

The photovoltaic cell of claim 7, wherein the coating is fabricated using a solution that comprises greater than 140 mg of barium titanate per a 3 ml solution.