Palladium nanoparticle enhanced giant photoresponse at LaAlO3/SrTiO3 two-dimensional electron gas heterostructures

Ngai Yui Chan; Meng Zhao; Ning Wang; Kit Au; Juan Wang; Lai Wa Helen Chan; Jiyan Dai

doi:10.1021/nn4029184

Palladium nanoparticle enhanced giant photoresponse at LaAlO3/SrTiO3 two-dimensional electron gas heterostructures

ACS Nano. 2013 Oct 22;7(10):8673-9. doi: 10.1021/nn4029184. Epub 2013 Sep 9.

Authors

Ngai Yui Chan¹, Meng Zhao, Ning Wang, Kit Au, Juan Wang, Lai Wa Helen Chan, Jiyan Dai

Affiliation

¹ Department of Applied Physics, The Hong Kong Polytechnic University , Hung Hom, Kowloon, Hong Kong, People's Republic of China.

PMID: 24003972
DOI: 10.1021/nn4029184

Abstract

With LaAlO3 surface modification by Pd nanoparticles, LaAlO3/SrTiO3 (LAO/STO) interfacial two-dimensional electron gas presents a giant optical switching effect with a photoconductivity on/off ratio as high as 750% under UV light irradiation. Pd nanoparticles with a size around 2 nm are deposited on top of the LAO surface, and the LAO/STO interface exhibits a giant response to UV light with a wavelength shorter than 400 nm. This giant optical switching behavior has been explained by the Pd nanoparticle's catalytic effect and surface/interface charge coupling.