Investigation of Thermal Diffusivity of Nano-Structured TiO2 Films

Poor interfacial contact is often encountered in nanoparticulate film-based devices. The dye-sensitized solar cell (DSSC) is a representative case in which a nanoporous TiO(2) electrode needs to be prepared on the transparent conducting oxide (TCO)-coated glass substrate. In this study, we demonstrate that the inter-electrode contact resistance accounts for a considerable portion of the total resistance of a DSSC and its efficiency can be greatly enhanced by welding the interface with a laser. TiO(2) films formed on the TCO-coated glass substrate were irradiated with a pulsed ultraviolet laser beam at 355 nm; this transmits through the TCO and glass but is strongly absorbed by TiO(2). Electron microscopy analysis and impedance measurements showed that a thin continuous TiO(2) layer is formed at the interface as a result of the local melting of TiO(2) nanoparticles and this layer completely bridges the gap between the two electrodes, improving the current flow with a reduced contact resistance. We were able to improve the efficiency by 35-65% with this process. DSSCs fabricated using a homemade TiO(2) paste revealed an efficiency improvement from eta = 3.3% to 5.4%, and an increase from 8.2% to 11.2% was achieved with the TiO(2) electrodes made from a commercial paste.

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Investigation of Thermal Diffusivity of Nano-Structured TiO2 Films

Cited by 2 publications

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Thermo-physical properties of thin films composed of anatase TiO2 nanofibers

Thermo-physical properties of thin films composed of anatase TiO2 nanofibers

Laser welding of nanoparticulate TiO₂and transparent conducting oxide electrodes for highly efficient dye-sensitized solar cell

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Investigation of Thermal Diffusivity of Nano-Structured TiO2 Films

Cited by 2 publications

References 0 publications

Thermo-physical properties of thin films composed of anatase TiO2 nanofibers

Thermo-physical properties of thin films composed of anatase TiO2 nanofibers

Laser welding of nanoparticulate TiO2and transparent conducting oxide electrodes for highly efficient dye-sensitized solar cell

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Laser welding of nanoparticulate TiO₂and transparent conducting oxide electrodes for highly efficient dye-sensitized solar cell