In dye-sensitized solar cells (DSSCs), the physical properties and microstructure of nano-titanium dioxide film
electrode are the key factors to influence the photo-electric characters greatly and they are also determined by the
preparation techniques. A new electrode of double-layer TiO2 with different structure was designed and prepared by
spin-coating and screen-printing techniques alternately. Such two types of layers have different contribution to the
photo-electric conversion functions. Compact TiO2 film made by spin-coating only absorbs little dyes, but it works
as a barrier layer between ITO and electrolyte. The porous TiO2 film made by screen-printing will absorb more
dyes, and results in higher photocurrent. At the end, the effect of the compact layer on I-V properties of the DSSCs
was discussed.
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