Abstract
Through the bulk photovoltaic effect (BPVE), devices based on ferroelectric (FE) perovskite oxides can overcome the Shockley-Queisser efficiency limit for solar cells. For efficient visible-light absorption, these oxides require the usually contradictory properties of small band gap and a ${d}^{0}$ transition metal at the $B$ site in their $A\phantom{\rule{0}{0ex}}B$O${}_{3}$ structure. Here both first-principles calculations and experiment are used to study the cosubstitution of Mo and Ti for Nb in KNbO${}_{3}$. This substitution yields a band gap of 2.2 eV while preserving the FE polarization. The obtained solid solution is a promising absorber material for photovoltaic applications exploiting the BPVE.
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