Similarly, clogging or precipitation
of the dye substance inside a stainless sponge could cause
problems, and maintenance (clean up) or replacement of the
apparatus is necessary after each usage regardless of whether
the same dye substance is used or not. Moreover, this spincoating
process still generates a considerable amount of
chemical wastes, although the used dye solution is designed
to be fully recycled. Just like the leftover dye solution from the
conventional immersion dyeing process, it is hardly reusable
due to the change of concentration and possible decomposition
of the dye substance after the TiO2 dyeing process, which is
detrimental to the performance of fabricated DSCs