The bandgap (also written as band gap) is the minimum energy required for an electron to transition from the valence band – where electrons are bound to atoms – to the conduction band, where they can ...
2D map of the valence band states (x-axis in eV) in Mo-doped BiVO4 as a function of photon energy (y-axis). The presence of small polarons can be deducted from the spot at approx. 2 eV.
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