Comparative Study between Dye-Sensitized and CdS Quantum-Dots-Sensitized TiO2 Solar Cells Using Photoinduced Absorption Spectroscopy | Zendy

Idriss Bedja | Zendy; Anders Hagfeldt | Zendy

Open Access

Comparative Study between Dye-Sensitized and CdS Quantum-Dots-Sensitized TiO₂ Solar Cells Using Photoinduced Absorption Spectroscopy

Author(s) -

Idriss Bedja,

Anders Hagfeldt

Publication year - 2011

Publication title -

advances in optoelectronics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.118

H-Index - 21

eISSN - 1687-5648

pISSN - 1687-563X

DOI - 10.1155/2011/424071

Subject(s) - photochemistry , quantum dot , dye sensitized solar cell , electrolyte , spectroscopy , absorption spectroscopy , absorption (acoustics) , ultrafast laser spectroscopy , radical , chemistry , materials science , electrode , optoelectronics , optics , organic chemistry , physics , quantum mechanics , composite material

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 I2−. 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)

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