Single-crystelline hexagonal silicon-germanium

HIT Hauge, T Hauge, Sonia Conesa Boj, M.A. Verheijen, S. Koelling, Erik Bakkers

Research output: Contribution to journalArticleScientificpeer-review


Group IV materials with the hexagonal diamond crystal structure have been predicted to exhibit promising optical and electronic properties. In particular, hexagonal silicon–germanium (Si1–xGex) should be characterized by a tunable direct band gap with implications ranging from Si-based light-emitting diodes to lasers and quantum dots for single photon emitters. Here we demonstrate the feasibility of high-quality defect-free and wafer-scale hexagonal Si1–xGex growth with precise control of the alloy composition and layer thickness. This is achieved by transferring the hexagonal phase from a GaP/Si core/shell nanowire template, the same method successfully employed by us to realize hexagonal Si. We determine the optimal growth conditions in order to achieve single-crystalline layer-by-layer Si1–xGex growth in the preferred stoichiometry region. Our results pave the way for exploiting the novel properties of hexagonal Si1–xGex alloys in technological applications.
Original languageEnglish
Pages (from-to)85-90
Number of pages6
JournalNano Letters: a journal dedicated to nanoscience and nanotechnology
Publication statusPublished - 2017


  • core/shell nanowire
  • growth rate
  • hexagonal crystral structure
  • kinetics
  • silicon-germanium
  • single-crystalline


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