Comparative Study between Dye-Sensitized and CdS Quantum-Dots-Sensitized TiO2Solar Cells Using Photoinduced Absorption Spectroscopy

[摘要] Two 8 μm thick TiO2photoelectrodes 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 TiO2and iodine radicalsI2−.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 TiO2and 11.5 ms for dye-sensitized TiO2).

[学科分类] 电子、光学、磁材料