Photo-resistive properties of LaAl0.6Cr0.4O3/SrTiO3 heterostructures: A comparative study with LaAlO3/SrTiO3

V. Aswin; Pramod Kumar; Prabir Pal; Anjana Dogra

doi:10.1364/OL.41.001134

Photo-resistive properties of LaAl_0.6Cr_0.4O₃/SrTiO₃ heterostructures: A comparative study with LaAlO₃/SrTiO₃

V. Aswin, Pramod Kumar, Prabir Pal, Anjana Dogra

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8 Scopus citations

Abstract

We report photoconductivity measurements on LaAl_1-x Cr_xO₃/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.

Original language	English
Pages (from-to)	1134-1137
Number of pages	4
Journal	Optics Letters
Volume	41
Issue number	6
DOIs	https://doi.org/10.1364/OL.41.001134
State	Published - 15 Mar 2016
Externally published	Yes

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© 2016 Optical Society of America.

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title = "Photo-resistive properties of LaAl0.6Cr0.4O3/SrTiO3 heterostructures: A comparative study with LaAlO3/SrTiO3",

abstract = "We report photoconductivity measurements on LaAl1-x CrxO3/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.",

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T1 - Photo-resistive properties of LaAl0.6Cr0.4O3/SrTiO3 heterostructures

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AU - Aswin, V.

AU - Kumar, Pramod

AU - Pal, Prabir

AU - Dogra, Anjana

PY - 2016/3/15

Y1 - 2016/3/15

N2 - We report photoconductivity measurements on LaAl1-x CrxO3/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.

AB - We report photoconductivity measurements on LaAl1-x CrxO3/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.

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Photo-resistive properties of LaAl_0.6Cr_0.4O₃/SrTiO₃ heterostructures: A comparative study with LaAlO₃/SrTiO₃

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