Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/27375
Title: Enhanced surface-and-interface coupling in Pd-nanoparticle-coated LaAlO3/SrTiO3 heterostructures : strong gas- and photo-induced conductance modulation
Authors: Kim, H
Chan, NY
Dai, JY 
Kim, DW
Issue Date: 2014
Publisher: Nature Publishing Group
Source: Scientific reports, 2014, v. 5, 8531 How to cite?
Journal: Scientific reports 
Abstract: Pd nanoparticle (NP) coated LaAlO3/SrTiO3 (LAO/STO) heterointerface exhibits more notable conductance (G) change while varying the ambient gas (N2, H2/N2, and O2) and illuminating with UV light (wavelength: 365 nm) than a sample without the NPs. Simultaneous Kelvin probe force microscopy and transport measurements reveal close relationships between the surface work function (W) and G of the samples. Quantitative analyses suggest that a surface adsorption/desorption-mediated reaction and redox, resulting in a band-alignment modification and charge-transfer, could explain the gas- and photo-induced conductance modulation at the LAO/STO interface. Such surface-and-interface coupling enhanced by catalytic Pd NPs is a unique feature, quite distinct from conventional semiconductor hetero-junctions, which enables the significant conductance tunability at ultrathin oxide heterointerfaces by external stimuli.
URI: http://hdl.handle.net/10397/27375
EISSN: 2045-2322
DOI: 10.1038/srep08531
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