Electrophoretic deposition of Ga-Cu core-shell nanocomposites for CuGaS2 thin films

Title
Electrophoretic deposition of Ga-Cu core-shell nanocomposites for CuGaS2 thin films
Authors
이연수차지현민병권정덕영
Keywords
CuGaS2; thin films; CIGS; Photovoltaic cells; Precursor; Core-shell; Chemical reductions
Issue Date
2014-06
Publisher
Solar energy materials and solar cells
Citation
VOL 125, 138-144
Abstract
This work reports on the syntheses of copper-gallium bimetallic nanoparticles by ultrasound-assisted chemical reduction method in alcohol solutions to prepare CuGaS2 thin films. Gallium metal (Ga) in the form of pellet was dispersed in tetraethylene glycol by ultrasonic treatment. The chemical reduction of copper sulfate (CuSO4) into copper metal by NaBH4 at the surface of the Ga droplets enabled the formation of Ga–Cu core–shell structure. The Ga droplets with submicrometer size were homogenously coated with ~40-nm Cu nanoparticles. The exothermic transition of the Ga–Cu core–shell nanocomposite materials occurred at 485 °C, which corresponds to the crystalline phase formation of γ-Cu9Ga4. Ga–Cu nanocomposites with a 1:1 ratio were deposited onto molybdenum substrate via electrophoretic deposition method as a precursor of CuGaS2, a p-type semiconductor. Mechanical pressing and sulfurization provided dense CuGaS2 thin films with good crystallinity and high phase purity.
URI
http://pubs.kist.re.kr/handle/201004/47375
ISSN
09270248
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KIST Publication > Article
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