Kim, Haeri Chan, Ngai Yui Dai, Ji-yan Kim, Dong-Wook 2024-01-20T07:34:01Z 2024-01-20T07:34:01Z 2021-09-05 2015-02-23 2045-2322 https://pubs.kist.re.kr/handle/201004/125752 Pd nanoparticle (NP) coated LaAlO3/SrTiO3 (LAO/STO) heterointerface exhibits more notable conductance (G) change while varying the ambient gas (N-2, H-2/N-2, and O-2) 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. English NATURE PUBLISHING GROUP ELECTRON-GAS FILMS Enhanced Surface-and-Interface Coupling in Pd-Nanoparticle-coated LaAlO3/SrTiO3 Heterostructures: Strong Gas- and Photo-Induced Conductance Modulation Article 10.1038/srep08531 1 SCIENTIFIC REPORTS, v.5 SCIENTIFIC REPORTS 5 scie scopus 000349712900004 2-s2.0-84923368188 Multidisciplinary Sciences Science & Technology - Other Topics Article ELECTRON-GAS FILMS Surface Photo Voltage LaAlO3/SrTiO3 Heterostructure KPFM Work Function Nano Particle