Abstract
A dye-sensitized solar cell (DSSC) fabricated by using a novel silyl-anchor coumarin dye with alkyl-chain substitutes, a Br3−/Br− redox electrolyte solution containing water, and a Mg2+-doped anatase-TiO2 electrode with twofold surface modification by MgO and Al2O3 exhibited an open-circuit photovoltage over 1.4 V, demonstrating the possibility of DSSCs as practical photovoltaic devices.
Highlights
Dye-sensitized solar cells (DSSCs, Figs S1 and S2) have been investigated actively as practical photovoltaic cells of the generation, because of their ease of fabrication, shorter energy and CO2 payback times, possibly flexible and colorful characteristics, and fine photovoltaic properties especially in low-light intensities and under scattered lights such as indoor conditions[1,2,3]
The alkoxysilyl coumarin dye of ADEKA-3 exhibited similar UV-visible absorption spectra to SFD-5 in solutions, and a major absorption band of ADEKA-3 solution assignable to the π-π* transition was observed in visible region between 350 and 500 nm
The HOMO level is more positive than the redox potential of ~0.9 V vs. NHE of the Br3−/Br− redox[10,13,22], providing thermodynamic driving force for the dye regeneration reaction by the electron transfer from the Br3−/Br− redox mediator to the oxidized dye formed through the light-excited-electron injection to the TiO2 electrode
Summary
Dye-sensitized solar cells (DSSCs, Figs S1 and S2) have been investigated actively as practical photovoltaic cells of the generation, because of their ease of fabrication, shorter energy and CO2 payback times, possibly flexible and colorful characteristics, and fine photovoltaic properties especially in low-light intensities and under scattered lights such as indoor conditions[1,2,3]. We newly designed and synthesized an alkoxysilyl coumarin dye of ADEKA-3 (Fig. 1b), and succeeded in obtaining the photovoltage higher than 1.4 V by preparing Mg-doped TiO2 with larger Mg composition, applying twofold metal-oxide surface modification to the Mg-doped TiO2 electrodes by MgO and Al2O3, and adding water to the electrolyte solution of Br3−/ Br− redox mediator with using the advantage of the durability of the alkoxysilyl-dye adsorbed electrodes to water.
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