Controlling Bi-Provoked Nanostructure Formation in GaAs/GaAsBi Core-Shell Nanowires

Teruyoshi Matsuda, Kyohei Takada, Kohsuke Yano, Rikuo Tsutsumi, Kohei Yoshikawa, Satoshi Shimomura, Yumiko Shimizu, Kazuki Nagashima, Takeshi Yanagida, Fumitaro Ishikawa

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


We control the formation of Bi-induced nanostructures on the growth of GaAs/GaAsBi core-shell nanowires (NWs). Bi serves as not only a constituent but also a surfactant and nanowire growth catalyst. Thus, we paved a way to achieve unexplored III-V nanostructures employing the characteristic supersaturation of catalyst droplets, structural modifications induced by strain, and incorporation into the host GaAs matrix correlated with crystalline defects and orientations. When Ga is deficient during growth, Bi accumulates on the vertex of core GaAs NWs and serves as a nanowire growth catalyst for the branched structures to azimuthal <112>. We find a strong correlation between Bi accumulation and stacking faults. Furthermore, Bi is preferentially incorporated on the GaAs (112)B surface, leading to spatially selective Bi incorporation into a confined area that has a Bi concentration of over 7%. The obtained GaAs/GaAsBi/GaAs heterostructure with an interface defined by the crystalline twin defects in a zinc-blende structure can be potentially applied to a quantum confined structure. Our finding provides a rational design concept for the creation of GaAsBi based nanostructures and the control of Bi incorporation beyond the fundamental limit.

Original languageEnglish
Pages (from-to)8510-8518
Number of pages9
JournalNano Letters
Issue number12
Publication statusPublished - Dec 11 2019

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering


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