Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 22, Issue 17, Pages 8444-8448Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm16555d
Keywords
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Funding
- cooperative RD Program [B551179-08-03-00]
- Korea Research Council Industrial Science and Technology, Republic of Korea
- Converging Research Center through the National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology [2011K000579]
- National Research Council of Science & Technology (NST), Republic of Korea [산업-일반-협동8] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2010-50309] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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CuInSe2 (CIS) absorber layers for thin film solar cells were fabricated via 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).
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