Abstract
This work investigated the flow-field structure of the aerosol when spray pyrolyzing alkoxide sols on the anode of fiber-shaped dye sensitized solar cell. The re-atomization of alkoxide sols was optimized via computational fluid dynamics simulation and validated by experimental observation to provide aerosol flow with higher uniformity. The interaction between the fiber substrates and the aerosol flow was also studied. Different from that on the traditional plate substrate, two flow patterns would be generated, including the flow split in two flanks along the axial direction and the flow around the cylindrical surface. The interference of different flows would result periodical convergences of streamlines. With the assistant of the flow around the cylindrical surface, necklace-like sol drops would then accumulated along the fibers, which is also related with the surface tension. Fiber-shaped photo-anode with different micro structures of TiO2 films have been prepared from different type of aerosol flows and applied in fiber-shaped dye-sensitized solar cell. To improve the performance, the re-atomization should be further enhanced and the convergence of streamlines should be avoided. The mechanism of spray pyrolysis on fiber is evidently different from that on plate substrates.
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