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Kwon, Tae-Hyuk
Energy Recognition
Research Interests
  • Energy transfer, organic solar cells, supercapacitor, ultrasonic spray chemistry, dithienothiophene, iridium complexes, phosphorescent bioapplications


Dye regeneration and charge recombination in dye-sensitized solar cells with ferrocene derivatives as redox mediators

DC Field Value Language Daeneke, Torben ko Mozer, Attila J. ko Kwon, Tae-Hyuk ko Duffy, Noel W. ko Holmes, Andrew B. ko Bach, Udo ko Spiccia, Leone ko 2014-11-14T00:09:27Z - 2014-11-13 ko 2012-05 ko
dc.identifier.citation ENERGY & ENVIRONMENTAL SCIENCE, v.5, no.5, pp.7090 - 7099 ko
dc.identifier.issn 1754-5692 ko
dc.identifier.uri -
dc.description.abstract Ferrocene compounds are promising redox shuttles for application in dye-sensitized solar cells (DSCs). Chemical modification of the cyclopentadienyl rings is easily achievable affording almost unlimited variation of the redox properties. This allows fine-tuning of the driving force for dye-regeneration and optimization of the energy conversion efficiency of DSCs. Herein, six ferrocene derivatives have been chosen for investigation which cover the large redox potential range of 0.85 V, by virtue of simple alkylation and halogenation of the cyclopentadienyl ring, and enable improved matching of the energy levels of the sensitizer and the electrolyte. Although the focus of this work was to examine the effect of the redox potential on charge transfer processes, DSCs were fabricated which achieved high energy conversion efficiencies of over 5%. Charge transfer reactions were studied to reveal the dependence of the dye regeneration rate, recombination losses and recombination pathways on the reaction driving force. An increase in redox potential led to a higher efficiency due to higher open circuit potentials until a threshold is reached. At this threshold, the driving force for dye regeneration (18 kJ mol -1, ΔE = 0.19 V) becomes too small for efficient device operation, leading to rapid recombination between the oxidized dye and electrons in the TiO2 conduction band. As a result of this work guidelines can be formulated to aid the selection of redox couples for a particular sensitizer in order to maximize the utilization of incident solar energy. ko
dc.description.statementofresponsibility close -
dc.language 영어 ko
dc.publisher ROYAL SOC CHEMISTRY ko
dc.title Dye regeneration and charge recombination in dye-sensitized solar cells with ferrocene derivatives as redox mediators ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-84860385736 ko
dc.identifier.wosid 000303251500052 ko
dc.type.rims ART ko
dc.description.wostc 50 *
dc.description.scopustc 40 * 2015-05-06 * 2014-11-13 *
dc.identifier.doi 10.1039/c2ee21257a ko
dc.identifier.url ko
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