# US 2014/0190562 A1 · Solar cell backsheet and solar cell module

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- Number: US 2014/0190562 A1
- Document ID: US20140190562A1
- Status: Published application
- Kind: A1
- Application number: 14/204,061
- Filed: 2014-03-11
- Published: 2014-07-10
- Earliest claimed: 2011-09-14
- Assignees: FUJIFILM Corporation
- Applicants: FUJIFILM Corporation
- Inventors: Yuuki TESHIMA; Mitsunori HACHISUKA; Naoya IMAMURA
- Web page: https://patentgrep.com/patent/US20140190562A1

## CPC

- B32B 17/10018: {comprising only one glass sheet}
- B32B 17/10788: {containing ethylene vinylacetate}
- B32B 27/36: comprising polyesters
- H10F 19/85: Protective back sheets
- B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer
- B32B 2255/26: Polymeric coating
- Y02E 10/50: Photovoltaic [PV] energy
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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 solar cell backsheet is provided which includes: a substrate that is a biaxially stretched polyethylene terephthalate film having a pre-peak temperature of from 160° C. to 225° C. as measured by differential scanning calorimetry (DSC); a coating layer that is provided at at least one side of the substrate, and includes a binder containing an acrylic resin, a crosslinked structure part derived from a carbodiimide crosslinking agent, and inorganic fine particles; and an adhesive layer that is provided on the coating layer, and includes a resin binder as a main component.

## Claims

### Claim 1

A solar cell backsheet comprising:
a substrate that is a biaxially stretched polyethylene terephthalate film having a pre-peak temperature of from 160° C. to 225° C. as measured by differential scanning calorimetry (DSC):
a coating layer that is provided at at least one side of the substrate, and comprises a binder containing an acrylic resin, a crosslinked structure part derived from a carbodiimide crosslinking agent, and inorganic fine particles; and
an adhesive layer that is provided on the coating layer, and comprises a resin binder as a main component.

### Claim 2 (depends on 1)

The solar cell backsheet according to claim 1, wherein an acid value A of the acrylic resin, an equivalent B of the carbodiimide crosslinking agent, and a mass ratio X of the carbodiimide crosslinking agent to the acrylic resin (carbodiimide crosslinking agent/acrylic resin) satisfies the following Formula (1):
(0.8AB)/56100<X<(2.0AB)/56100 (1).

### Claim 3 (depends on 1)

The solar cell backsheet according to claim 1, wherein the inorganic fine particles contain tin oxide.

### Claim 4 (depends on 1)

The solar cell backsheet according to claim 1, wherein the inorganic fine particles contain tin oxide as a main component, and a content of the inorganic fine particles in the coating layer is from 50% by mass to 500% by mass with respect to a total mass of the binder.

### Claim 5 (depends on 1)

The solar cell backsheet according to claim 1, wherein the pre-peak temperature of the substrate is from 205° C. to 225° C.

### Claim 6 (depends on 1)

The solar cell backsheet according to claim 1, wherein a content of the binder in the coating layer is from 0.02 g/m2 to 0.1 g/m2.

### Claim 7 (depends on 1)

The solar cell backsheet according to claim 1, wherein an equivalent B of the carbodiimide crosslinking agent is from 200 to 500.

### Claim 8 (depends on 1)

The solar cell backsheet according to claim 1, wherein the adhesive layer further comprises a crosslinked structure part derived from an epoxy crosslinking agent.

### Claim 9 (depends on 1)

A solar cell module comprising:
a transparent substrate into which sunlight enters,
a solar cell element disposed at one side of the substrate, and
the solar cell backsheet according to claim 1 disposed at an opposite side of the solar cell element from a side of the solar cell element at which the substrate is disposed.

### Claim 10 (depends on 2)

The solar cell backsheet according to claim 2, wherein the inorganic fine particles contain tin oxide.

### Claim 11 (depends on 2)

The solar cell backsheet according to claim 2, wherein the inorganic fine particles contain tin oxide as a main component, and a content of the inorganic fine particles in the coating layer is from 50% by mass to 500% by mass with respect to a total mass of the binder.

### Claim 12 (depends on 2)

The solar cell backsheet according to claim 2, wherein the pre-peak temperature of the substrate is from 205° C. to 225° C.

### Claim 13 (depends on 2)

The solar cell backsheet according to claim 2, wherein a content of the binder in the coating layer is from 0.02 g/m2 to 0.1 g/m2.

### Claim 14 (depends on 2)

The solar cell backsheet according to claim 2, wherein an equivalent B of the carbodiimide crosslinking agent is from 200 to 500.

### Claim 15 (depends on 2)

The solar cell backsheet according to claim 2, wherein the adhesive layer further comprises a crosslinked structure part derived from an epoxy crosslinking agent.

### Claim 16 (depends on 2)

A solar cell module comprising:
a transparent substrate into which sunlight enters,
a solar cell element disposed at one side of the substrate, and
the solar cell backsheet according to any one of claim 2 disposed at an opposite side of the solar cell element from a side of the solar cell element at which the substrate is disposed.