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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
Ewha Authors
조윌렴
SCOPUS Author ID
조윌렴scopus
Issue Date
2016
Journal Title
RSC ADVANCES
ISSN
2046-2069JCR Link
Citation
vol. 6, no. 105, pp. 103337 - 103345
Publisher
ROYAL SOC CHEMISTRY
Indexed
SCIE; SCOPUS WOS scopus
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 (V-OC) and current density (J(SC)).
DOI
10.1039/c6ra22563b
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자연과학대학 > 물리학전공 > Journal papers
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