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US 9,806,211 B2Granted
Tandem solar cell with improved absorption material
AssigneeInternational Business Machines Corporation
InventorsOki Gunawan, Jeehwan Kim, David B. Mitzi, Devendra K. Sadana, Teodor K. Todorov
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Abstract
A photosensitive device and method includes a top cell having an N-type layer, a P-type layer and a top intrinsic layer therebetween. A bottom cell includes an N-type layer, a P-type layer and a bottom intrinsic layer therebetween. The bottom intrinsic layer includes a Cu—Zn—Sn containing chalcogenide.
Claims20
A method for fabrication of a tandem photovoltaic device, comprising:
- forming a bottom cell having an N-type layer, a P-type layer and a bottom intrinsic layer therebetween, wherein the bottom intrinsic layer includes a Cu—Zn—Sn containing chalcogenide and is formed by applying a deposition solution in a nitrogen-filled container, the deposition solution comprising a first proportional part consisting of about 0.573 g Cu2S and about 0.232 g S in about 3 ml of hydrazine and a second proportional part consisting of about 0.790 g SnSe, about 1.736 g Se, and about 0.32 g Zn in about 7 ml of hydrazine;
- and
- forming a top cell over the bottom cell to form a tandem cell, the top cell having an N-type layer, a P-type layer and a top intrinsic layer therebetween.
A method for fabrication of a tandem photovoltaic device, comprising:
- forming a bottom cell having an N-type layer, a P-type layer and a bottom intrinsic layer therebetween, wherein the bottom intrinsic layer includes a Cu—Zn—Sn containing chalcogenide and is formed by applying a deposition solution on the bottom cell P-type layer by spin-coating at about 800 rpm and heating the deposition solution at about 540° C. for about 2 minutes in a nitrogen-filled container, the deposition solution comprising a mixture of a first proportional part consisting of about 0.573 g Cu2S and about 0.232 g S in about 3 ml of hydrazine and a second proportional part consisting of about 0.790 g SnSe, about 1.736 g Se, and about 0.32 g Zn in about 7 ml of hydrazine;
- and
- forming a top cell over the bottom cell to form a tandem cell, the top cell having an N-type layer, a P-type layer and a top intrinsic layer therebetween.
Dependencies are inferred from the claim text.