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Two different effects of Na on Cu2ZnSnS4 thin-film solar cells

Title
Two different effects of Na on Cu2ZnSnS4 thin-film solar cells
Authors
Yang, Kee-JeongSim, Jun-HyoungSon, Dae-HoKim, Dae-HwanKang, Jin-Kyu
DGIST Authors
Yang, Kee-JeongKim, Dae-HwanKang, Jin-Kyu
Issue Date
2015-11
Citation
Current Applied Physics, 15(11), 1512-1515
Type
Article
Article Type
Article
Keywords
AnnealingAnnealing ProcessCopperCZTSDifferent EffectsGrain BoundariesMinority-Carrier CollectionMinority CarrierNaPower Conversion EfficienciesSodiumSolar CellsThin-Film Solar CellThin-Film Solar CellsThin-FilmsTrapping
ISSN
1567-1739
Abstract
Among the many factors that affect the characteristics of Cu2ZnSnS4 thin-film solar cells, the effects of Na were examined. Because Na passivates the grain boundaries (GBs) in absorber layers, the GBs increase the minority carrier collection by providing a current pathway through which the minority carriers can reach the buffer and window layer and be collected. However, excess Na remains in the absorber layer and diffuses into the buffer and window layers, where it acts as an impurity and traps the minority carriers, thus decreasing the solar cell characteristics. By applying an annealing process after the deposition of the buffer and window layers, the Na content could be decreased. By improving the solar cell characteristics, a power conversion efficiency of 6.43% was achieved. © 2015 Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/5160
DOI
10.1016/j.cap.2015.08.021
Publisher
Elsevier B.V.
Related Researcher
Files:
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Collection:
Convergence Research Center for Solar Energy1. Journal Articles


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