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dc.contributor.author강용수-
dc.date.accessioned2017-08-22T04:53:51Z-
dc.date.available2017-08-22T04:53:51Z-
dc.date.issued2015-11-
dc.identifier.citationACS APPLIED MATERIALS & INTERFACES, Page. 25741-25747en_US
dc.identifier.issn1944-8244-
dc.identifier.issn1944-8252-
dc.identifier.urihttp://pubs.acs.org/doi/10.1021/acsami.5b07211-
dc.identifier.urihttp://hdl.handle.net/20.500.11754/28692-
dc.description.abstractDye aggregation and electron recombination in TiO2 photoanodes are the two major phenomena lowering the energy conversion efficiency of dye-sensitized solar cells (DSCs). Herein, we introduce a novel surface modification strategy of TiO2 photoanodes by the fluorinated self-assembled monolayer (F-SAM) formation with 1H,1H,2H,2H-perfluorooctyltriethoxysilane (PFTS), blocking the vacant sites of the TiO2 surface after dye adsorption. The F-SAM helps to efficiently lower the surface tension, resulting in efficient repelling ions, e.g., I-3(-), in the electrolyte to decrease the electron recombination rate, and the role of F-SAM is characterized in detail by impedance spectroscopy using a diffusion-recombination model. In addition, the dye aggregates on the TiO2 surface are relaxed by the F-SAM with large conformational perturbation (i.e., helix structure) seemingly because of steric hindrance developed during the SAM formation. Such multifunctional effects suppress the electron recombination as well as the intermolecular interactions of dye aggregates without the loss of adsorbed dyes, enhancing both the photocurrent density (11.9 -> 13.5 mA cm(-2)) and open-circuit voltage (0.67 -> 0.72 V). Moreover, the combined surface modification with the F-SAM and the classical coadsorbent further improves the photovoltaic performance in DSCs.en_US
dc.description.sponsorshipThis work was financially supported by the National Creative Research Initiative Center for Intelligent Hybrids (Grant 2010-0018290) and the IRTG program (Grant 2011-0032203) through the National Research Foundation of Korea grant and the BK21 Plus Program funded by the Ministry of Education, Science, and Technology of Korea. Additionally, this work was supported by the Korea Center for Artificial Photosynthesis (Grant 2009-0093883).en_US
dc.language.isoenen_US
dc.publisherAMER CHEMICAL SOCen_US
dc.subjectdye-sensitized solar cellen_US
dc.subjectdye aggregationen_US
dc.subjectelectron recombinationen_US
dc.subjectfluorinated self assembled monolayeren_US
dc.subjectsurface engineeringen_US
dc.titleSurface Modification of TiO2 Photoanodes with Fluorinated Self-Assembled Monolayers for Highly Efficient Dye-Sensitized Solar Cellsen_US
dc.typeArticleen_US
dc.identifier.doi10.1021/acsami.5b07211-
dc.relation.page25741-25747-
dc.relation.journalACS APPLIED MATERIALS & INTERFACES-
dc.contributor.googleauthorWooh, Sanghyuk-
dc.contributor.googleauthorKim, Tea-Yon-
dc.contributor.googleauthorSong, Donghoon-
dc.contributor.googleauthorLee, Yon-Gun-
dc.contributor.googleauthorLee, Tae Kyung-
dc.contributor.googleauthorBergmann, Victor W.-
dc.contributor.googleauthorWeber, Stefan A. L.-
dc.contributor.googleauthorBisquert, Juan-
dc.contributor.googleauthorKang, Yong Soo-
dc.contributor.googleauthorChar, Kookheon-
dc.relation.code2015001547-
dc.sector.campusS-
dc.sector.daehakCOLLEGE OF ENGINEERING[S]-
dc.sector.departmentDEPARTMENT OF ENERGY ENGINEERING-
dc.identifier.pidkangys-
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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