title: Crystal structure transfer in core/shell nanowires.
abstract: Structure engineering is an emerging tool to control opto-electronic properties of semiconductors. Recently, control of crystal structure and the formation of a twinning superlattice have been shown for III-V nanowires. This level of control has not been obtained for Si nanowires, the most relevant material for the semiconductor industry. Here, we present an approach, in which a designed twinning superlattice with the zinc blende crystal structure or the wurtzite crystal structure is transferred from a gallium phosphide core wire to an epitaxially grown silicon shell. These materials have a difference in lattice constants of only 0.4%, which allows for structure transfer without introducing extra defects. The twinning superlattices, periodicity, and shell thickness can be tuned with great precision. Arrays of free-standing Si nanotubes are obtained by a selective wet-chemical etch of the core wire.
authors.affiliation: Materials Innovation Institute (M2i), 2628CD Delft, The Netherlands.
authors.forename: Rienk E
authors.initials: RE
authors.lastname: Algra
authors.forename: Moïra
authors.initials: M
authors.lastname: Hocevar
authors.forename: Marcel A
authors.initials: MA
authors.lastname: Verheijen
authors.forename: Ilaria
authors.initials: I
authors.lastname: Zardo
authors.forename: George G W
authors.initials: GG
authors.lastname: Immink
authors.forename: Willem J P
authors.initials: WJ
authors.lastname: van Enckevort
authors.forename: Gerhard
authors.initials: G
authors.lastname: Abstreiter
authors.forename: Leo P
authors.initials: LP
authors.lastname: Kouwenhoven
authors.forename: Elias
authors.initials: E
authors.lastname: Vlieg
authors.forename: Erik P A M
authors.initials: EP
authors.lastname: Bakkers
mesh_terms: D003460:Crystallization / Q000379:methods*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D012825:Silicon / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D046911:Macromolecular Substances; D012825:Silicon