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Kim, Kyunhwan,Eo, Young-Joo,Cho, Ara,Gwak, Jihye,Yun, Jae Ho,Shin, Keeshik,Ahn, Seoung Kyu,Park, Sang Hyun,Yoon, Kyunghoon,Ahn, SeJin The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.17
<P>CuInSe<SUB>2</SUB> (CIS) absorber layers for thin film solar cells were fabricated <I>via</I> a non-vacuum route using amorphous Cu–In–Se nanoparticle precursors prepared by a low temperature colloidal process within one minute of reaction without any external heating. In particular, we intentionally added a chelating agent to the nanoparticle colloid in order to increase the density of the final films by enhancing the viscous flow of precursor materials during high temperature selenization. This is based on the decreased reactivity of precursor particles due to the formation of chelate complexes at particle surfaces. While the CIS films formed from the amorphous Cu–In–Se particles without surface modification were found to have large voids, those formed from surface modified particles showed flat and dense morphologies. In accordance with the improvements in the film morphology and density, efficiencies of the devices were also significantly increased from 0% (complete short circuit in the case without surface modification) to 4.41% (with surface modification).</P> <P>Graphic Abstract</P><P>A novel process for forming dense CIS films from amorphous Cu–In–Se nanoparticles chelated with ethanolamine was suggested. By this approach, a cell efficiency of up to 4.41% was demonstrated. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm16555d'> </P>
FABRICATION OF CuInSe₂(CIS) THIN FILM SOLAR CELL VIA A NON-VACUUM PROCESS
Young-Joo Eo,Wonha Lee,Kyunhwan Kim,SeJin Ahn,Ara Cho,Jihye Gwak,Kyunghoon Yoon,Keeshik Shin,Seung Kyu Ahn,Jun Sik Cho,Ju Hyung Park,Jin Su Yu,Kihwan Kim,Se Youn Moon,Hyo Rim Jung,Jin Hyeok Kim,Jae Ho 한국신재생에너지학회 2014 AFORE Vol.2014 No.-
Ahn, Sejin,Choi, Yoo Jeong,Kim, Kyunhwan,Eo, Young-Joo,Cho, Ara,Gwak, Jihye,Yun, Jae Ho,Shin, Keeshik,Ahn, Seoung Kyu,Yoon, Kyunghoon Wiley-VCH 2013 ChemSusChem Vol.6 No.7
<P>CuInSe2 (CISe) absorber layers for thin-film solar cells were fabricated through the selenization of amorphous Cu-In-S nanoparticles, which were prepared by using a low-temperature colloidal process within one minute without any external heating. Two strategies for obtaining highly dense CISe absorber films were used in this work; the first was the modification of nanoparticle surface through chelate complexation with ethanolamine, and the second strategy utilized the lattice expansion that occurred when S atoms in the precursor particles were replaced with Se during selenization. The synergy of these two strategies allowed formation of highly dense CISe thin films, and devices fabricated using the absorber layer demonstrated efficiencies of up to 7.94% under AM 1.5G illumination without an anti-reflection coating.</P>