000189659 001__ 189659
000189659 005__ 20181203023301.0
000189659 0247_ $$2doi$$a10.1039/c3cp50997d
000189659 022__ $$a1463-9076
000189659 02470 $$2ISI$$a000317980600013
000189659 037__ $$aARTICLE
000189659 245__ $$aRegeneration and recombination kinetics in cobalt polypyridine based dye-sensitized solar cells, explained using Marcus theory
000189659 260__ $$aCambridge$$bRoyal Society of Chemistry$$c2013
000189659 269__ $$a2013
000189659 300__ $$a11
000189659 336__ $$aJournal Articles
000189659 520__ $$aRegeneration and recombination kinetics was investigated for dye-sensitized solar cells (DSCs) using a series of different cobalt polypyridine redox couples, with redox potentials ranging between 0.34 and 1.20 V vs. NHE. Marcus theory was applied to explain the rate of electron transfer. The regeneration kinetics for a number of different dyes (L0, D35, Y123, Z907) by most of the cobalt redox shuttles investigated occurred in the Marcus normal region. The calculated reorganization energies for the regeneration reaction ranged between 0.59 and 0.70 eV for the different organic and organometallic dyes investigated. Under the experimental conditions employed, the regeneration efficiency decreased when cobalt complexes with a driving force for regeneration of 0.4 eV and less were employed. The regeneration efficiency was found to depend on the structure of the dye and the concentration of the redox couples. [Co(bpy-pz)(2)](2+), which has a driving force for regeneration of 0.25 eV for the triphenylamine based organic dye, D35, was found to regenerate 84% of the dye molecules, when a high concentration of the cobalt complex was used. Recombination kinetics between electrons in TiO2 and cobalt(III) species in the electrolyte was also studied using steady state dark current measurements. For cobalt complexes with highly positive redox potentials (>0.55 V vs. NHE) dark current was found to decrease, consistent with electron transfer reactions occurring in the Marcus inverted region. However, for the cobalt complexes with the most positive redox potentials an increase in dark current was found, which can be attributed to recombination mediated by surface states.
000189659 700__ $$aFeldt, Sandra M.$$uUppsala Univ, Angstrom Lab, Dept Chem, S-75120 Uppsala, Sweden
000189659 700__ $$aLohse, Peter W.$$uUppsala Univ, Angstrom Lab, Dept Chem, S-75120 Uppsala, Sweden
000189659 700__ $$0244232$$aKessler, Florian$$g205239
000189659 700__ $$0240422$$aNazeeruddin, Mohammed K.$$g105958
000189659 700__ $$0240191$$aGraetzel, Michael$$g105292
000189659 700__ $$aBoschloo, Gerrit$$uUppsala Univ, Angstrom Lab, Dept Chem, S-75120 Uppsala, Sweden
000189659 700__ $$0248439$$aHagfeldt, Anders$$g164385$$uUppsala Univ, Angstrom Lab, Dept Chem, S-75120 Uppsala, Sweden
000189659 773__ $$j15$$k19$$q7087-7097$$tPhysical Chemistry Chemical Physics
000189659 909C0 $$0252060$$pLPI$$xU10101
000189659 909C0 $$0252532$$pLSPM$$xU12908
000189659 909CO $$ooai:infoscience.tind.io:189659$$pSB$$particle
000189659 917Z8 $$x105528
000189659 917Z8 $$x148230
000189659 937__ $$aEPFL-ARTICLE-189659
000189659 973__ $$aEPFL$$rREVIEWED$$sPUBLISHED
000189659 980__ $$aARTICLE