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

Research output: Contribution to journal › Article › peer-review

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

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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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.",

author = "V. Aswin and Pramod Kumar and Prabir Pal and Anjana Dogra",

note = "Publisher Copyright: {\textcopyright} 2016 Optical Society of America.",

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

T2 - A comparative study with LaAlO3/SrTiO3

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.

UR - https://www.scopus.com/pages/publications/84961879777

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DO - 10.1364/OL.41.001134

M3 - Article

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SN - 0146-9592

VL - 41

SP - 1134

EP - 1137

JO - Optics Letters

JF - Optics Letters

IS - 6

ER -

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

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