Charge transport versus recombination in dye-sensitized solar cells employing nanocrystalline TiO2 and SnO2 films

Article Abstract:

A comparison of charge transport and recombination dynamics in dye-sensitized solar cells (DSSCs) employing nanocrystalline TiO2 and SnO2 films is reported and the impact of these dynamics upon photovoltaic device efficiency is addressed. It is concluded that such a large acceleration of electron dynamics within the metal oxide films of DSSCs may in general be determental to device efficiency and the implications of this conclusion strategies to optimize device performance is discussed.

Usage, Electric properties, Tin compounds, Solar cells, Solar batteries

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Calculation of activation energies for transport and recombination in mesoporous TiO2/dye/electrolyte films-taking into account surface charge shifts with temperature

Article Abstract:

Transient photovoltage and photocurrent measurements are employed to determine the recombination and transport kinetics in operating dye-sensitized photovoltaic cells as a function of potential and temperature. The results are consistent with the presence of a distribution of traps below the TiO2 conduction band, the detrapping from which limits both the transport and the recombination of electrons.

Electron transport, Electrolytes, Photovoltaic cells

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Transient absorption studies and numerical modeling of iodine photoreduction by nanocrsytalline TiO2 films

Article Abstract:

The study of the reaction between photogenerated electrons in a dye-free nanocrystalline titanium dioxide film and an iodine/iodide redox couple is presented using transient absorption spectroscopy. Recombination kinetics is measured by recording the transient optical signal following band gap excitation by an ultra violet laser pulse.

Semiconductors and related devices, Semiconductor and Related Device Manufacturing, Thin Film Materials, Thin films, Dielectric films, Absorption spectra

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