# US 2013/0240010 A1 · Solar cell and manufacturing method thereof

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- Number: US 2013/0240010 A1
- Document ID: US20130240010A1
- Status: Published application
- Kind: A1
- Application number: 13/585,438
- Filed: 2012-08-14
- Published: 2013-09-19
- Earliest claimed: 2012-03-13
- Assignees: Samsung Electronics Co., Ltd.
- Inventors: Yun Gi KIM
- Web page: https://patentgrep.com/patent/US20130240010A1

## CPC

- H10F 77/311: {for photovoltaic cells}
- H10F 10/161: comprising multiple PN heterojunctions, e.g. tandem cells
- H10F 10/167: comprising Group I-III-VI materials, e.g. CdS/CuInSe2 [CIS] heterojunction photovoltaic cells
- H10F 77/45: Wavelength conversion means, e.g. by using luminescent material, fluorescent concentrators or up-conversion arrangements
- Y02E 10/52: PV systems with concentrators
- Y02E 10/541: CuInSe2 material PV cells
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- 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
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

According to example embodiments, a solar cell includes a transparent base substrate having a first surface and a second surface opposite the first surface, a first photoelectric layer having a thin film shape on the first surface of the base substrate; and a second photoelectric layer having a thin film shape on the second surface of the base substrate. A bandgap of the second photoelectric layer may be different than a bandgap of the first photoelectric layer.

## Claims

### Claim 1

A solar cell comprising:
a transparent base substrate having a first surface and a second surface opposite the first surface;
a first photoelectric layer having a thin film shape on the first surface of the base substrate; and
a second photoelectric layer having a thin film shape on the second surface of the base substrate,
the second photoelectric layer having a bandgap different than a bandgap of the first photoelectric layer.

### Claim 2 (depends on 1)

The solar cell of claim 1, wherein
the first surface is under the second surface, and
the bandgap of the first photoelectric layer is smaller than the bandgap of the second photoelectric layer.

### Claim 3 (depends on 2)

The solar cell of claim 2, further comprising:
first and second terminals connected to the first photoelectric layer,
the first photoelectric layer being between the base substrate and the first and second terminals; and
third and fourth terminals connected to the second photoelectric layer,
the second photoelectric layer being between the base substrate and the third and fourth terminals.

### Claim 4 (depends on 3)

The solar cell of claim 3, wherein
the first photoelectric layer includes first and second impurity regions connected to the first and second terminals, respectively,
the first and second impurity regions having opposite conductivities, and
the second photoelectric layer includes third and fourth impurity regions connected to the third and fourth terminals, respectively,
the third and fourth impurity regions having opposite conductivities.

### Claim 5 (depends on 3)

The solar cell of claim 3, further comprising:
a passivation layer between the base substrate and the first photoelectric layer.

### Claim 6 (depends on 1)

The solar cell of claim 1, further comprising:
a wavelength conversion member between the base substrate and the first photoelectric layer,
wherein the wavelength conversion member is configured to change a wavelength of incident light.

### Claim 7 (depends on 6)

The solar cell of claim 6, wherein the wavelength conversion member is a pattern on the base substrate.

### Claim 8 (depends on 6)

The solar cell of claim 6, wherein the wavelength conversion member includes nanoparticles.

### Claim 9 (depends on 1)

The solar cell of claim 1, wherein the base substrate includes an insulator.

### Claim 10 (depends on 9)

The solar cell of claim 9, wherein the base substrate includes at least one of glass, quartz, and plastic.

### Claim 11 (depends on 1)

The solar cell of claim 1, wherein the base substrate has a thickness from about 50 microns to about 10 centimeters.

### Claim 12

A method of manufacturing a solar cell, the method comprising:
forming a first photoelectric layer by thin film deposition on a first surface of a transparent insulating base substrate;
forming a second photoelectric layer by thin film deposition on a second surface of the base substrate,
the second photoelectric layer having a bandgap different from a bandgap of the first photoelectric layer,
the first surface and the second surface of the base substrate being opposite to each other;
forming a first electrode on the first photoelectric layer opposite the base substrate; and
forming a second electrode on the second photoelectric layer opposite the base substrate.

### Claim 13 (depends on 12)

The method of claim 12, wherein
the first surface is under the second surface, and
the bandgap of the first photoelectric layer is less than the bandgap of the second photoelectric layer.

### Claim 14 (depends on 13)

The method of claim 13, further comprising:
forming a plurality of impurity regions by implanting impurities in the first and second photoelectric layers.

### Claim 15 (depends on 13)

The method of claim 13, further comprising:
forming a passivation layer between the base substrate and the first photoelectric layer.

### Claim 16 (depends on 12)

The method of claim 12, further comprising:
forming a wavelength conversion member between the base substrate and the first photoelectric layer,
the wavelength conversion member configured to change a wavelength of incident light.

### Claim 17 (depends on 16)

The method of claim 16, wherein the forming the wavelength conversion member comprises:
forming a pattern on the base substrate.

### Claim 18 (depends on 16)

The method of claim 16, wherein the forming the wavelength conversion member comprises:
forming nanoparticles on the base substrate.

### Claim 19 (depends on 12)

The method of claim 12, wherein the base substrate includes at least one of glass, quartz, and plastic.

### Claim 20 (depends on 12)

The method of claim 12, wherein the base substrate has a thickness from about 50 microns to about 10 centimeters.

### Claim 21 (depends on 12)

The method of claim 12, wherein the thin film deposition includes one of chemical deposition and physical deposition.