Influence of Acid Modification Multiwall Carbon Nanotube Counter Electrodes on the Glass and Flexible Dye-Sensitized Solar Cell Performance

Figure 3

(a) XPS survey spectra of unmodified-carbon nanotubes (U-CNTs) and modified-carbon nanotubes (M-CNTs), C1s spectra of (b) U-M-CNTs.

(a)

(b)

(c)