Figure 7. Variation of (αhν)2 versus hν for direct band gap transitions in (a) TiO2/Nb2O5 composite (b) TiO2 and (c) Nb2O5 films.

From

Electrophoretic Deposition and Characterization of TiO2/Nb2O5 Composite Thin Films for Dye Sensitized Solar Cells

John Nguu, Francis Nyongesa, Robinson Musembi, Bernard Aduda

Journal of Materials Physics and Chemistry. 2018, 6(1), 1-8 doi:10.12691/jmpc-6-1-1