Photoabsorption Enhancement in Synthetic-Natural Dye-Sensitized Solar Cells Using Bilayer TiO₂ Deposition and Separated Sensitization

Figure 1

The chemical structure of (a) N719 [60], (b) betanin [18], (c) crocin [66], (d) acacetin [67], and (e) indigo [68].

(a)

(b)

(c)

(d)

(e)