Palladium nanoparticle enhanced giant photoresponse at LaAlO 3/SrTiO3 two-dimensional electron gas heterostructures

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

Research output: Journal article publicationJournal articleAcademic researchpeer-review

48 Citations (Scopus)

Abstract

With LaAlO3 surface modification by Pd nanoparticles, LaAlO 3/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.
Original languageEnglish
Pages (from-to)8673-8679
Number of pages7
JournalACS Nano
Volume7
Issue number10
DOIs
Publication statusPublished - 22 Oct 2013

Keywords

  • interface
  • LaAlO /SrTiO 3 3
  • photoresponse
  • two-dimensional electron gas

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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