A DSSC sensitized by a mixed extract had an efficiency
of around the average value of those sensitized with rosella
and blue pea extracts. This result is in agreement with the
absorption spectrum of the extract coated on TiO2.
However, this is rather different from the result by Kumara
et al. [8], in which a DSSC fabricated using chlorophyll and
shisonin dyes showed synergistic effect of both dyes. The
results in this work, are influenced by low interaction
between blue pea extract and TiO2 film as mentioned
above.
Under preparation and irradiation conditions, the
DSSCs prepared from a rosella extract showed a comparable
performance to the DSSCs prepared from other
natural dyes (Table 1). Therefore, the rosella extract should
be an alternative anthocyanin source for DSSC preparation
in geographical regions that rosella is widely available