Giant conductivity switching of LaAlO 3/SrTiO 3 heterointerfaces governed by surface protonation

Keith A. Brown, Shu He, Daniel J. Eichelsdoerfer, Mengchen Huang, Ishan Levy, Hyungwoo Lee, Sangwoo Ryu, Patrick Irvin, Jose Mendez-Arroyo, Chang Beom Eom, Chad A. Mirkin, Jeremy Levy*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

Abstract

Complex-oxide interfaces host a diversity of phenomena not present in traditional semiconductor heterostructures. Despite intense interest, many basic questions remain about the mechanisms that give rise to interfacial conductivity and the role of surface chemistry in dictating these properties. Here we demonstrate a fully reversible >4 order of magnitude conductance change at LaAlO 3/SrTiO 3 (LAO/STO) interfaces, regulated by LAO surface protonation. Nominally conductive interfaces are rendered insulating by solvent immersion, which deprotonates the hydroxylated LAO surface; interface conductivity is restored by exposure to light, which induces reprotonation via photocatalytic oxidation of adsorbed water. The proposed mechanisms are supported by a coordinated series of electrical measurements, optical/solvent exposures, and X-ray photoelectron spectroscopy. This intimate connection between LAO surface chemistry and LAO/STO interface physics bears far-reaching implications for reconfigurable oxide nanoelectronics and raises the possibility of novel applications in which electronic properties of these materials can be locally tuned using synthetic chemistry.

Original languageEnglish (US)
Article number10681
JournalNature communications
Volume7
DOIs
StatePublished - Feb 10 2016

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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