Three-Dimensional Monolayer Graphene and TiO2 Hybrid Architectures for High-Efficiency Electrochemical Photovoltaic Cells

Title
Three-Dimensional Monolayer Graphene and TiO2 Hybrid Architectures for High-Efficiency Electrochemical Photovoltaic Cells
Authors
박원일
Keywords
SENSITIZED SOLAR-CELLS; ELECTRODES; FILMS; RECOMBINATION; TRANSPARENT; PHOTOANODES; PERFORMANCE; STRENGTH; DEVICES; IONS
Issue Date
2015-03
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF PHYSICAL CHEMISTRY C, v. 119, NO 12, Page. 6880-6885
Abstract
Three-dimensional (3D), tubular-structured monolayer graphene networks were hybridized with TiO2 nanoparticular layer for futuristic and robust electrode applications. A continuous form of 3D graphene with good carrier mobility provides a direct pathway for electrons to the current collector for a photoanode in dye-sensitized solar cells. This characteristic feature, coupled with its energy level, ensures an enhanced charge collection efficiency. Particular attention was paid to the graphene surface functionalization and the effective loading of TiO2 nanoparticles to improve the light harvesting and minimize electron recombination for a photoanode. The optimal hybrid structure resulted in a 10% enhanced energy conversion efficiency, compared to the TiO2-based analogue without graphene. The impedance spectra confirmed that the increase in photovoltaic performance was mainly driven by the efficient charge collection through the 3D, tubular-structured monolayer graphene. This new electrode prototype can serve as a good complement to conventional TiO2 nanostructures.
URI
http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.5b00178http://hdl.handle.net/20.500.11754/22701
ISSN
1932-7447; 1932-7455
DOI
http://dx.doi.org/10.1021/acs.jpcc.5b00178
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ETC
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