METHOD FOR PRODUCING Cu2ZnSnS4-xSex (0 LESS THAN-EQUAL TO X LESS THAN-EQUAL TO 4) THIN FILM BY ONE STEP ELECTRODEPOSITION IN ELECTROLYTIC BATH CONTAINING IONIC LIQUID
First Claim
1. A method for producing a CZTSe precursor film, the method comprising(a1) preparing a CZTSe ionic solution comprising a Cu precursor, a Zn precursor, a Sn precursor, a Se precursor, and an anhydrous ionic liquid, and(b1) electrodepositing the CZTSe ionic solution on a substrate.
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Abstract
A Cu2ZnSnS4-xSex (0≦x≦4) thin film solar cell is disclosed. The thin film solar cell includes a Cu2ZnSnS4-xSex (0≦x≦4) thin film as an absorber layer produced by forming a precursor film composed of Cu, Zn, Sn, and Se using an ionic liquid as a solvent through a constant current process and annealing the precursor film with sulfur. Also disclosed is a method for fabricating the thin film solar cell. The method uses a non-vacuum electrodeposition process that is appropriate for large-area mass production and is thus cost effective compared to a vacuum process. In addition, since the method uses an ionic liquid, the formation of by-products harmful to humans as a result of side reactions is suppressed. Furthermore, the method uses a one-step electrodeposition process, which enables the deposition of a maximum of four elements at one time, or a multi-step deposition process, and an annealing process.
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Citations
15 Claims
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1. A method for producing a CZTSe precursor film, the method comprising
(a1) preparing a CZTSe ionic solution comprising a Cu precursor, a Zn precursor, a Sn precursor, a Se precursor, and an anhydrous ionic liquid, and (b1) electrodepositing the CZTSe ionic solution on a substrate.
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2. A method for producing a CZTSe precursor film, the method comprising
(a2) preparing a CZT ionic solution comprising a Cu precursor, a Zn precursor, a Sn precursor, and an anhydrous ionic liquid, (b2) electrodepositing the CZT ionic solution on a substrate to form a CZT precursor film, and (c2) annealing the CZT precursor film in a Se atmosphere.
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3. A method for producing a CZTSe precursor film, the method comprising
(a3) preparing a CTSe ionic solution comprising a Cu precursor, a Sn precursor, a Se precursor, and a first anhydrous ionic liquid, (b3) primarily electrodepositing the CTSe ionic solution on a substrate to form a CTSe precursor film, (c3) preparing a Zn ionic solution comprising a Zn precursor and a second anhydrous ionic liquid, and (d3) secondarily electrodepositing the Zn ionic solution on the CTSe precursor film.
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14. (canceled)
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15. (canceled)
Specification