Abstract
We report photoconductivity measurements on (, 0.4) heterostructures. A polar layer modification of metallic 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 photoconductivity of valence states of the 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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