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Visualizing Intrinsic 3D‐Strain Distribution in Gold Coated ZnO Microstructures by Bragg Coherent X‐Ray Diffraction Imaging and Transmission Electron Microscopy with Respect to Piezotronic Applications

Jordt, Philipp; Wolff, Niklas; Hrkac, Stjepan B.; Shree, Sindu; Wang, Di ORCID iD icon 1,2; Harder, Ross J.; Kübel, Christian ORCID iD icon 1,2; Adelung, Rainer; Shpyrko, Oleg G.; Magnussen, Olaf M.; Kienle, Lorenz; Murphy, Bridget M.
1 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)
2 Karlsruhe Nano Micro Facility (KNMF), Karlsruher Institut für Technologie (KIT)


Novel devices ranging from bio magnetic field sensors to energy harvesting nano machines utilize the piezotronic effect. For optimal function, understanding the interaction of electrical and strain phenomena within the semiconductor crystal is necessary. Here, studies of a model piezotronic system are presented, consisting of a ZnO microrod coated by a thin layer of gold, which forms a Schottky contact with the piezoelectric ZnO material. Coherent X-ray diffraction imaging (CXDI) and transmission electron microscopy (TEM) are used to visualize the structure and strain distribution, showing that the ZnO microrod exhibits strains of multiple origins in the bulk and at the interface. Strain values of −6 × 10$^{-4}$ have been measured by CXDI at the ZnO/Au interface. The origin is shown to be a combination of an interface strain, possibly caused by the Schottky contact formation, and distinct, localized electrical fields inside the crystal which are assigned to electron depletion and screening in a bent ZnO/Au piezotronic rod. These findings will contribute to sensor development and to a better understanding of piezotronic applications.

Verlagsausgabe §
DOI: 10.5445/IR/1000137964
Veröffentlicht am 24.09.2021
DOI: 10.1002/aelm.202100546
Zitationen: 2
Web of Science
Zitationen: 2
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Karlsruhe Nano Micro Facility (KNMF)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 11.2021
Sprache Englisch
Identifikator ISSN: 2199-160X, 2199-160X
KITopen-ID: 1000137964
HGF-Programm 43.35.03 (POF IV, LK 01) Structural and Functional Behavior of Solid State Systems
Weitere HGF-Programme 43.31.01 (POF IV, LK 01) Multifunctionality Molecular Design & Material Architecture
Erschienen in Advanced electronic materials
Verlag John Wiley and Sons
Band 7
Heft 11
Seiten Art.-Nr.: 2100546
Vorab online veröffentlicht am 11.08.2021
Nachgewiesen in Dimensions
Web of Science
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