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Evaluation of Band Alignment of SrNbO2N Using Hard X-ray Photoelectron Spectroscopy

The absolute band position is a key parameter to design and optimize functionalities of photoelectrochemical cells. We determine the absolute band position of SrNbO2N using hard X-ray photoelectron spectroscopy on epitaxial SrNbO2N films. We reveal that the conduction band minimum lies 0.36 ± 0.07 eV negative than the water reduction energy and the valence band maximum lies 0.22 ± 0.07 eV positive than the water oxidation energy. In other words, the band edges lie in positions that straddle the redox potential of water.