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Plasticity of Persistent Photoconductance of Amorphous LaAlO3/SrTiO3 Interfaces under Varying Illumination Condition

AuthorsChen, Yu; Casals, Blai ; Herranz, Gervasi
KeywordsPersistent photoconductance
Oxide interfaces
Neuromorphic engineering
Two-dimensional electron systems
Issue Date25-Jun-2019
PublisherAmerican Chemical Society
CitationACS Applied Electronic Materials 1(6): 810-816 (2019)
AbstractWe report on transport measurements under optical stimulation of persistent photoconductance (PPC) at the interface between amorphous LaAlO3 films and SrTiO3 crystals. The spectral response in the visible region was analyzed under varying illumination conditions and exposure times down to milliseconds. The PPC is plastically modulated by optical stimuli of varying strength and duration, demonstrating fine-tuned photoconductive responsivity over a diversity of cumulated timespans. Interestingly, under optimal conditions, the photoconductance is sensitive to intensity contrasts under conditions comparable to bright-sunlight environments. The prospects of exploiting photoconductance—including potential strategies to reach higher sensitivity—are discussed in the context of neuromorphic applications.
Publisher version (URL)http://dx.doi.org/10.1021/acsaelm.9b00127
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