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. 2019 Dec 17;12(24):4238. doi: 10.3390/ma12244238

Figure 2.

Figure 2

Reflection absorption spectra of various photoanode electrodes: (1) TiO2/FTO; (2) CdS/TiO2/FTO; and (3) CdSe/CdS/TiO2/FTO. In curves (2) and (3), the background including titania absorption has been subtracted for better presentation of the spectra. The tangential dashed lines give the average value of the band gap, i.e., 510 nm (2.43 eV) for the CdS/TiO2/FTO film and 610 nm (2.03 eV) for the CdSe/CdS/TiO2/FTO film. Insert: Film photographs.