Band engineering strontium titanate

Strontium titanate (SrTiO3) is a promising water-splitting catalyst for artificial photosynthesis, given its band-edge energies and stability in water. However, the wide optical band gap of SrTiO3 (3.2 eV) makes it inefficient for absorbing solar photons, the majority of which have lower energies. Here we identify routes for modifying the band gap of SrTiO3 by lowering orbital symmetry via anisotropic strain.