A Visible-NIR Responsive Dye-Sensitized Solar Cell Based on Diatom Frustules and Cosensitization of Photopigments from Diatom and Purple Bacteria

Figure 5

SEM images of (a) diatom frustules, (b) the external surface of diatom frustules, (c) the internal surface of diatom frustules, and (d) and (e) diatom frustule-TiO₂.

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(b)

(c)

(d)

(e)