Highly Efficient and Durable Quantum Dot Sensitized ZnO Nanowire Solar Cell Using Noble-Metal-Free Counter Electrode

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highly efficient quantum dot sensitized solar cell has been fabricated using a CdSe/CdS cosensitized ZnO nanowire array as a photoelectrode (PE), ordered mesocellular carbon foam (MSU-F-C) as a counter electrode (CE), and a polysulfide electrolyte as a hole transporter. The nanowire structure provides efficient photoelectron collection and light harvesting, and CdSe/CdS cosensitization allows utilization of the whole visible Wavelength region of the incident solar spectrum. The MSU-F-C used here provides an extremely high surface area and the ordered large size mesopares with an interconnected pore structure, which facilitate diffusion of redox relay in the electrolyte. As a result; it exhibits low charge transfer resistance (R(ct)) between the CE/electrolyte interface and thus presents highly efficient photovoltaic performance, compared to conventional noble-metal-based CEs. The cell with MSU-F-C CE yields the highest power conversion efficiency of 3.60%, V(oc), J(sc), and FF of 685 mV, 12.6 mA/cm(2), and 0.42, respectively. Furthermore, it exhibits high durability in the polysulfide electrolyte with remarkable stability irrespective of the solvent used in the electrolyte solution.
Publisher
AMER CHEMICAL SOC
Issue Date
2011-11
Language
English
Article Type
Article
Keywords

LOW-COST; CDS; CARBON; NANOCRYSTALS; ARRAYS; PBS

Citation

JOURNAL OF PHYSICAL CHEMISTRY C, v.115, no.44, pp.22018 - 22024

ISSN
1932-7447
DOI
10.1021/jp205844r
URI
http://hdl.handle.net/10203/245092
Appears in Collection
CBE-Journal Papers(저널논문)
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