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Thin film solar cell and method of fabricating the same

a technology solar cells, which is applied in the direction of sustainable manufacturing/processing, final product manufacturing, vacuum evaporation coating, etc., can solve the problems of low efficiency of thin film solar cells, high material cost of indium (in), and grain boundary defects, etc., to achieve excellent current-voltage characteristics, light conversion efficiency, and suppress grain boundary defects

Inactive Publication Date: 2015-04-30
DAEGU GYEONGBUK INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes a method for making a thin film solar cell that has very few defects in the grain boundaries of the light absorbing layer, and has good current-voltage characteristics and light conversion efficiency. This is achieved by controlling the diffusion of certain elements from the substrate to the first electrode.

Problems solved by technology

However, the solar cell having this composition has difficulty in realizing a low priced thin film solar cell since the reserve of indium (In) is restricted and the material cost of indium (In) is expensive.
However, the efficiency of the thin film solar cell is so low that the thin film solar cell cannot be applied for general purposes.

Method used

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  • Thin film solar cell and method of fabricating the same
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  • Thin film solar cell and method of fabricating the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0065]A soda lime glass substrate (100) was prepared, and a first electrode (200) of molybdenum (Mo) was deposited to have a thickness of about 0.5 μm on the substrate (100) through DC sputtering.

[0066]The first electrode was heat-treated at 400° C. for 10 minutes under nitrogen atmosphere.

example 2

[0067]A first electrode was formed by the same method as in example 1 except that the first electrode was heat-treated at 600° C.

manufacture examples 1 to 4

[0072]A CZT-based metallic precursor layer was formed by sputter-depositing a Zn precursor (301), a Sn precursor (302), and a Cu precursor (303) on each of the first electrodes (200) formed in examples 1 and 2 and comparative examples in the order shown in FIG. 5.

[0073]After that, the CZT-based metallic precursor layer was heat-treated according to a sulfurizing process. The heat treatment was conducted in a furnace including a first furnace and a second furnace. A sulfur (S) powder was heated at 300° C. in the first furnace, and the first electrode formed in example 1 was put in the second furnace, followed by a sulfurization treatment at a temperature of 600° C. As a result, as shown in FIG. 6, a CZTS-based light absorbing layer (300) was formed.

[0074]Then, a CdS buffer layer (400) of 60 nm, a ZnO window layer (500) of 400 nm, and an Al electrode (600) were formed on the CZTS-based light absorbing layer, thereby completing a CZTS-based thin film solar cell.

[0075](Photographing of ...

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Abstract

Disclosed is a thin film solar cell including a substrate, a first electrode, a light absorbing layer, a buffer layer, a window layer, and a second electrode, wherein a compound layer of MxSy or MxSey (here, M is metal, and x and y each are a natural number) is present in an interface between the first electrode and the light absorbing layer, the thickness of the compound layer of MxSy or MxSey being 150 nm or less.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a thin film solar cell and a method for manufacturing the same, and more particularly, to a method for manufacturing a thin film solar cell having improved light conversion efficiency through a heat treatment process of a first electrode.[0003]2. Description of the Prior Art[0004]Chalcopyrite-based solar cell technology is highly likely to ensure high efficiency in all thin film solar cell technologies. CuInSe2, CuInS2, Cu(In,Ga)Se2, or the like, is used for the thin film solar cell. However, the solar cell having this composition has difficulty in realizing a low priced thin film solar cell since the reserve of indium (In) is restricted and the material cost of indium (In) is expensive.[0005]A thin film solar cell having a light absorbing layer of CZTS(Cu2ZnSn(S,Se)4) has been suggested as an alternative to solve the problem. The CZTS-based solar cell enables the realization of low-pric...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01L31/032C23C14/18H01L31/0224C23C14/34H01L31/18H01L31/0392
CPCH01L31/0326H01L31/1868H01L31/1872C23C14/185H01L31/0392H01L31/022425C23C14/34H01L31/18C23C14/5866H01L31/03923Y02E10/541Y02P70/50H01L31/04C23C14/5806
Inventor YANG, KEE JEONGJEON, BO RAMSIM, JUN HYOUNGSON, DAE HOKANG, JIN KYU
Owner DAEGU GYEONGBUK INST OF SCI & TECH
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