Journal
APPLIED PHYSICS LETTERS
Volume 92, Issue 4, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2835707
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TiO2 is an attractive material for photocatalytic water splitting, but its band gap is too large to allow for efficient absorption of solar photons. We present a comprehensive first-principles investigation of band-structure modifications induced by alloying TiO2 with TiS2. The band gap of TiO2(1-x)S2x alloys exhibits a dramatic decrease upon addition of even a low concentration of S. The optical absorption of visible light is attainable with sulfur concentrations less than x=0.25. We have verified that the band alignment in these alloys is favorable for photocatalytic applications: in particular, the conduction band exhibits only small shifts, while the majority of the band-gap change is due to an upward shift of the valence band.
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