Abstract
Two 8 μm thick TiO2 photoelectrodes have been sensitized separately by N719 dye molecules and CdS quantum dots for a comparison study. Photoinduced absorption (PIA) spectroscopy was employed to investigate the mechanistic properties of electrons under illumination conditions comparable to sunlight. The PIA spectrum of both electrodes (in the presence of electrolyte) is due to electrons in TiO2 and iodine radicals in the electrolyte. In the absence of redox electrolyte, both electrodes show long-lived photoinduced charge-separation with lifetime in a millisecond range (8.5 ms for Q-dot-sensitized TiO2 and 11.5 ms for dye-sensitized TiO2).
Highlights
IntroductionNanostructured solar cells sensitized by organic dyes (DSSCs) [1,2,3,4,5,6] or by inorganic short bandgap semiconductors ( called quantum dots, QDs) [7,8,9,10] have attracted a great deal of interest
Photoinduced absorption (PIA) spectroscopy was employed to investigate the mechanistic properties of electrons under illumination conditions comparable to sunlight
Nanostructured solar cells sensitized by organic dyes (DSSCs) [1,2,3,4,5,6] or by inorganic short bandgap semiconductors [7,8,9,10] have attracted a great deal of interest
Summary
Nanostructured solar cells sensitized by organic dyes (DSSCs) [1,2,3,4,5,6] or by inorganic short bandgap semiconductors ( called quantum dots, QDs) [7,8,9,10] have attracted a great deal of interest. They are capable to obtain efficient conversion of solar energy to electricity at a low cost comparative to conventional semiconductor photovoltaic devices [11, 12]. In contrast with the dye-sensitized solar cells, fundamental understanding of factors controlling the interfacial electron transfer reactions in QD sensitized solar cells is limited
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