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Revealing the photocharge-transfer mechanism at manganite-buffered LaAlO3/SrTiO3 interfaces by giant photoresponse
Publikationstyp
Journal Article
Date Issued
2020-03-04
Sprache
English
Author(s)
Volume
12
Issue
9
Start Page
11197
End Page
11203
Citation
ACS Applied Materials and Interfaces 12 (9): 11197-11203 (2020)
Publisher DOI
Scopus ID
Publisher
American Chemical Society
The photoinduced phase transition at complex oxides remains one of the very important issues because of the emergent physics and potential applications. In particular, the mechanism of charge transfer at interfaces under irradiation is challenging. Herein, the photoinduced properties of manganite-buffered LaAlO3/SrTiO3 interfaces with different thicknesses of the buffer layer are systematically investigated. The giant photoresponse is observed, and its relative change in resistance is about 6.24 × 106% at T = 20 K for the sample with a buffer layer thickness of 4.8 nm. Moreover, the transition temperature is enhanced by increasing the thickness of the buffer layer. More importantly, the dead layer effect at the interfaces has been suppressed by using light. All these results are attributed to the charge transfer because of the octahedral tilting at low temperatures and provide a new kind of oxide-based optical devices, such as ultraviolet detectors. This piece of work will pave the way toward two-dimensional electron gas-based optoelectronic devices.
Subjects
buffer layer
complex oxides
dead layer effect
giant photoresponse
octahedral tilting
DDC Class
540: Chemistry
620: Engineering