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Highly Electrocatalytic Cu2ZnSn(S1-xSex)(4) Counter Electrodes for Quantum-Dot-Sensitized Solar Cells

Title
Highly Electrocatalytic Cu2ZnSn(S1-xSex)(4) Counter Electrodes for Quantum-Dot-Sensitized Solar Cells
Author
방진호
Keywords
quantum-dot-sensitized solar cells; copper zinc tin sulfur (selenium); counter electrodes; electrocatalytic activity; NANOCRYSTALS; CONVERSION; CARBON
Issue Date
2013-02
Publisher
AMER CHEMICAL SOC
Citation
ACS APPLIED MATERIALS & INTERFACES, 2013, 5(3), P.479-484
Abstract
Traditional Pt counter electrode in quantum-dot-sensitized solar cells suffers from a low electrocatalytic activity and instability due to irreversible surface adsorption of sulfur species incurred while regenerating polysulfide (S-n(2-)/S2-) electrolytes. To overcome such constraints, chemically synthesized Cu2ZnSn(S1-xSex)(4) nanocrystals were evaluated as an alternative to Pt. The resulting chalcogenides exhibited remarkable electrocatalytic activities for reduction of polysulfide (S-n(2-)) to sulfide (S2-), which were dictated by the ratios of S/Se. In this study, a quantum dot sensitized solar cell constructed with Cu2ZnSn(S0.5Se0.5)(4) as a counter electrode showed the highest energy conversion efficiency of 3.01%, which was even higher than that using Pt (1.24%). The compositional variations in between Cu2ZnSnS4 (x = 0) and Cu2ZnSnSe4 (x = 1) revealed that the solar cell performances were closely related to a difference in electrocatalytic activities for polysulfide reduction governed by the S/Se ratios.
URI
http://pubs.acs.org/doi/ipdf/10.1021/am302522chttp://hdl.handle.net/20.500.11754/51824
ISSN
1944-8244
DOI
10.1021/am302522c
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GRADUATE SCHOOL[S](대학원) > ETC
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