Highly Efficient Copper-Zinc-Tin-Selenide (CZTSe) Solar Cells by Electrodeposition

Title
Highly Efficient Copper-Zinc-Tin-Selenide (CZTSe) Solar Cells by Electrodeposition
Authors
전종옥이기두오이슬서세원이도권김홍곤정증현고민재김봉수손해정김진영
Keywords
CZTSSe; thin film solar cell; electrodeposition; electrochemistry; energy conversion; solar cells; thin films
Issue Date
2014-04
Publisher
ChemSusChem
Citation
VOL 7, NO 4, 1073-1077
Abstract
Highly efficient copper–zinc–tin–selenide (Cu2ZnSnSe4; CZTSe) thin-film solar cells are prepared via the electrodepostion technique. A metallic alloy precursor (CZT) film with a Cu-poor, Zn-rich composition is directly deposited from a single aqueous bath under a constant current, and the precursor film is converted to CZTSe by annealing under a Se atmosphere at temperatures ranging from 400 °C to 600 °C. The crystallization of CZTSe starts at 400 °C and is completed at 500 °C, while crystal growth continues at higher temperatures. Owing to compromises between enhanced crystallinity and poor physical properties, CZTSe thin films annealed at 550 °C exhibit the best and most-stable device performances, reaching up to 8.0 % active efficiency; among the highest efficiencies for CZTSe thin-film solar cells prepared by electrodeposition. Further analysis of the electronic properties and a comparison with another state-of-the-art device prepared from a hydrazine-based solution, suggests that the conversion efficiency can be further improved by optimizing parameters such as film thickness, antireflection coating, MoSe2 formation, and p–n junction properties.
URI
http://pubs.kist.re.kr/handle/201004/47560
ISSN
18645631
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KIST Publication > Article
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