Surface Dynamics of Charge Transport in LaAlO3/SrTiO3 with Time-Resolved Kelvin Probe Force Microscopy

Smith, Hugh; Collins, Liam; Sehirlioglu, Alp

doi:10.1021/acsaelm.1c00954

Title: Surface Dynamics of Charge Transport in LaAlO₃/SrTiO₃ with Time-Resolved Kelvin Probe Force Microscopy

Journal Article · 20 December 2021 · ACS Applied Electronic Materials

DOI: https://doi.org/10.1021/acsaelm.1c00954 · OSTI ID:1883971

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Case Western Reserve Univ., Cleveland, OH (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Time-resolved Kelvin probe force microscopy (tr-KPFM) was used to map surface potential dynamics in LAO/STO under its critical thickness, where it acts as an insulator, as polarizing and depolarizing electric fields were applied to planar electrodes in ambient conditions. Two time constants, for polarization and relaxation (i.e., depolarization) each, were derived and were shown to be independent of the direction of electrical field, revealing the reproducibility and recovery of the surfaces. Ambient aging or recent electrical history did not change the surface kinetics as determined by tr-KPFM. During polarization, the faster time constant (~3–6 s) is likely associated with the transport of H+ ions through the full length of the channel. The slower time constant (~40–50 s), on the other hand, is observed across only half the channel width near the higher-potential–more positive–electrode, which is likely associated with an electrochemical reaction such as the dissociation of water. This slower time constant drops to ~10–20 s toward the middle of the channel which could represent the transport of OH– ions. Furthermore, during relaxation, the fast time constant is consistent with polarization and is correlated to the same mechanism while the slower time constant is higher than it was during polarization and may represent the reabsorption of moisture from the atmosphere.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1883971

Journal Information:: ACS Applied Electronic Materials, Journal Name: ACS Applied Electronic Materials Journal Issue: 1 Vol. 4; ISSN 2637-6113

Publisher:: ACS PublicationsCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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tr-KPFM

Title: Surface Dynamics of Charge Transport in LaAlO3/SrTiO3 with Time-Resolved Kelvin Probe Force Microscopy

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Title: Surface Dynamics of Charge Transport in LaAlO₃/SrTiO₃ with Time-Resolved Kelvin Probe Force Microscopy