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Effects of Mo back-contact annealing on surface potential and carrier transport in Cu2ZnSnS4 thin film solar cells

Title
Effects of Mo back-contact annealing on surface potential and carrier transport in Cu2ZnSnS4 thin film solar cells
Authors
Kim, JuranKim, Gee YeongJo, WilliamYang, Kee-JeongSim, Jun-HyoungKim, Dae-HwanKang, Jin-Kyu
DGIST Authors
Yang, Kee-JeongKim, Dae-HwanKang, Jin-Kyu
Issue Date
2016
Citation
RSC Advances, 6(105), 103337-103345
Type
Article
Article Type
Article
Keywords
AnnealingAnnealing TemperaturesAtmospheric TemperatureAtomic Force MicroscopyConductive Atomic Force MicroscopyCZTS Thin FilmsElectron-Hole RecombinationGrain BoundariesKelvin Probe Force MicroscopyMinority-Carrier CollectionNitrogen AtmospheresOpen Circuit VoltageSoda Lime GlassSodiumSolar CellsSurface PotentialThin-Film Solar CellsThin-Films
ISSN
2046-2069
Abstract
The effects of Na on Cu2ZnSnS4 (CZTS)-based solar cells have been examined with respect to surface potential and carrier transport. The Mo back-contact was annealed in a furnace for 10 minutes under a nitrogen atmosphere at different temperatures and CZTS thin films were subsequently grown by sputtering and sulfurization. The thickness of MoS2, formed during the sulfurization process, decreased as the Mo annealing temperature increased. Interestingly, the Na contents diffused from soda lime glass has increased as well. The current and surface potential near CZTS grain boundaries were investigated by Kelvin probe force microscopy (KPFM) and conductive atomic force microscopy (C-AFM) were used. Surface current increased with increasing annealing temperature and surface potential increased up to approximately 50 mV near GBs, which led to inhibition of electron-hole recombination and an increase in minority carrier collection near GBs. This observation explains the improvement of solar cell open circuit voltage (VOC) and current density (JSC). © 2016 The Royal Society of Chemistry.
URI
http://hdl.handle.net/20.500.11750/5144
DOI
10.1039/c6ra22563b
Publisher
Royal Society of Chemistry
Related Researcher
Files:
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Collection:
Convergence Research Center for Solar Energy1. Journal Articles


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