Effect of crystal structure on the Young's modulus of GaP nanowires

Prokhor A. Alekseev*, Bogdan R. Borodin, Pavel Geydt, Vladislav Khayrudinov, Kristina Bespalova, Demid A. Kirilenko, Rodion R. Reznik, Alexey Nashchekin, Tuomas Haggren, Erkki Lahderanta, George E. Cirlin, Harri Lipsanen, Mikhail S. Dunaevskiy

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)
16 Downloads (Pure)

Abstract

Young's modulus of tapered mixed composition (zinc-blende with a high density of twins and wurtzite with a high density of stacking faults) gallium phosphide (GaP) nanowires (NWs) was investigated by atomic force microscopy. Experimental measurements were performed by obtaining bending profiles of as-grown inclined GaP NWs deformed by applying a constant force to a series of NW surface locations at various distances from the NW/substrate interface. Numerical modeling of experimental data on bending profiles was done by applying Euler-Bernoulli beam theory. Measurements of the nano-local stiffness at different distances from the NW/substrate interface revealed NWs with a non-ideal mechanical fixation at the NW/substrate interface. Analysis of the NWs with ideally fixed base resulted in experimentally measured Young's modulus of 155 +/- 20 GPa for ZB NWs, and 157 +/- 20 GPa for WZ NWs, respectively, which are in consistence with a theoretically predicted bulk value of 167 GPa. Thus, impacts of the crystal structure (WZ/ZB) and crystal defects on Young's modulus of GaP NWs were found to be negligible.

Original languageEnglish
Article number385706
Number of pages8
JournalNanotechnology
Volume32
Issue number38
DOIs
Publication statusPublished - 17 Sept 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • GaP
  • nanowire
  • atomic force microscopy
  • WZ
  • ZB
  • Young's modulus
  • bending
  • III-V NANOWIRES
  • MECHANICAL-PROPERTIES
  • GAAS NANOWIRES
  • WURTZITE
  • RESONANCE
  • STRESS
  • CELL

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