V., Aswin and Kumar, Pramod and Pal, Prabir and Dogra, Anjana (2016) Photo-resistive properties of LaAl0.6Cr0.4O3/SrTiO3 heterostructures: a comparative study with LaAlO3/SrTiO3. Optics Letters, 41 (6). pp. 1134-1137. ISSN 0146-9592

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Abstract

We report photoconductivity measurements on LaAl1-x CrxO(3)/SrTiO3 (x = 0, 0.4) heterostructures. A polar layer modification of metallic LaAlO3/SrTiO3 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-d photoconductivity of Cr3+ 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. (C) 2016 Optical Society of America

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Optical Society of America.
Subjects:	Optics
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	12 Apr 2018 06:52
Last Modified:	12 Apr 2018 06:52
URI:	http://npl.csircentral.net/id/eprint/2321

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