Enhanced Surface-and-Interface Coupling in Pd-Nanoparticle-coated LaAlO3/SrTiO3 Heterostructures: Strong Gas- and Photo-Induced Conductance Modulation

被引：25

作者：

Kim, Haeri ^{[1
,2
]}

Chan, Ngai Yui ^{[3
]}

Dai, Ji-yan ^{[3
]}

Kim, Dong-Wook ^{[1
]}

机构：

[1] Ewha Womans Univ, Dept Phys, Seoul 120750, South Korea

[2] Korea Inst Sci & Technol, Clean Energy Res Ctr, Seoul 136791, South Korea

[3] Hong Kong Polytech Univ, Dept Appl Phys, Kowloon, Hong Kong, Peoples R China

来源：

SCIENTIFIC REPORTS | 2015年 / 5卷

基金：

新加坡国家研究基金会;

关键词：

ELECTRON-GAS; FILMS;

D O I：

10.1038/srep08531

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页数：6

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