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Title: Opto-mechano-electrical tripling in ZnO nanowires probed by photocurrent spectroscopy in a high-resolution transmission electron microscope

Photocurrent spectroscopy of individual free-standing ZnO nanowires inside a high-resolution transmission electron microscope (TEM) is reported. By using specially designed optical in situ TEM system capable of scanning tunneling microscopy probing paired with light illumination, opto-mechano-electrical tripling phenomenon in ZnO nanowires is demonstrated. Splitting of photocurrent spectra at around 3.3‚ÄČeV under in situ TEM bending of ZnO nanowires directly corresponds to nanowire deformation and appearance of expanded and compressed nanowire sides. Theoretical simulation of a bent ZnO nanowire has an excellent agreement with the experimental data. The splitting effect could be explained by a change in the valence band structure of ZnO nanowires due to a lattice strain. The strain-induced splitting provides important clues for future flexible piezo-phototronics.
Authors:
;  [1] ;  [2] ;  [3] ;  [4] ; ; ;  [1] ;  [4] ;  [5]
  1. International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, Ibaraki 3050044 (Japan)
  2. (Japan)
  3. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)
  4. National University of Science and Technology, MISIS, Leninskiy Prospect 4, Moscow 119049 (Russian Federation)
  5. (Russian Federation)
Publication Date:
OSTI Identifier:
22489182
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 9; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BENDING; DESIGN; EV RANGE 01-10; ILLUMINANCE; NANOWIRES; RESOLUTION; SCANNING TUNNELING MICROSCOPY; SIMULATION; SPECTRA; SPECTROSCOPY; STRAINS; TRANSMISSION ELECTRON MICROSCOPY; VALENCE; ZINC OXIDES