Abstract

We report photoconductivity measurements on ${\mathrm{LaAl}}_{1-x}{\mathrm{Cr}}_x{\mathrm{O}}_3/{\mathrm{SrTiO}}_3$ ($x=0$, 0.4) heterostructures. A polar layer modification of metallic ${\mathrm{LaAlO}}_3/{\mathrm{SrTiO}}_3$ heterostructure with Cr in the Al sites resulted in an increased photo-response (PR) and relaxation time, in addition to a distinct shift in the spectral weight toward the red end of the spectrum. The visible light photoconductivity is explained by $d\text{-}d$ photoconductivity of ${\mathrm{Cr}}^{3+}$ valence states of the $x=0.4$ sample. Besides the established UV sensitivity, we observe a weak peak in PR around 690 nm possibly emanating from the mid-gap states arising from oxygen vacancies.

© 2016 Optical Society of America

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