Fig. 6 | Scientific Reports

Fig. 6

From: Unveiling the role of localized polaronic mid-gap states in enhanced carrier transfer in TiO2/BiVO4 heterojunctions under visible light irradiation

Fig. 6

The presence of mid-gap states was further proved by PL spectra. (a) PL spectra of TiO2, BiVO4 and TiO2/BiVO4 under 379 nm excitation. (b) Comparison of PL spectra of the TiO2, BiVO4 and TiO2/BiVO4 with a 430 nm laser illumination. Inset: An enlarged view of the spectrum in the virtual box region. (c) Speculated charge transfer in TiO2/BiVO4 under visible light irradiation.

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