Abstract

We show that electron transport mechanisms in TiO(2) solid-state dye-sensitized solar cells (SDSCs) with spiro-OMeTAD as hole conductor are similar to those of high-performance DSCs with liquid electrolytes and ionic liquids. Impedance spectroscopy provides the parameters for transport and recombination at different conditions of steady state in the dark. The recombination rate is much higher in the solid solar cell, this being a main limiting step to obtain high-efficiency SDSCs. Thus, the expected gain in photovoltage, due to a lower hole Fermi level, is prevented by recombination losses. Under low potentials the transport is limited by the electron transport in the TiO(2), but at high potentials spiro-OMeTAD transport resistance reduces the fill factor and hence the efficiency on high-current devices.

Keywords

ChemistryDielectric spectroscopyRecombinationDye-sensitized solar cellElectron transport chainElectronSolar cellElectrolyteConductorLimitingChemical physicsLimiting currentElectron holeOptoelectronicsMolecular physicsCondensed matter physicsElectrochemistryElectrodePhysical chemistryPhysicsMaterials science

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Year
2008
Type
article
Volume
131
Issue
2
Pages
558-562
Citations
441
Access
Closed

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Francisco Fabregat‐Santiago, Juan Bisquert, Le Cevey et al. (2008). Electron Transport and Recombination in Solid-State Dye Solar Cell with Spiro-OMeTAD as Hole Conductor. Journal of the American Chemical Society , 131 (2) , 558-562. https://doi.org/10.1021/ja805850q

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DOI
10.1021/ja805850q