title: Sn-Seeded GaAs Nanowires as Self-Assembled Radial p-n Junctions.
abstract: The widespread use of Au as a seed particle in the fabrication of semiconductor nanowires presents a fundamental limitation to the potential incorporation of such nanostructures into electronic devices. Although several other growth techniques have been demonstrated, the use of alternative seed particle metals remains an underexplored but potentially very promising way to influence the properties of the resulting nanowires while simultaneously avoiding gold. In this Letter, we demonstrate the use of Sn as a seed particle metal for GaAs nanowires grown by metal-organic vapor phase epitaxy. We show that vertically aligned and stacking defect-free GaAs nanowires can be grown with very high yield. The resulting nanowires exhibit Esaki diode behavior, attributed to very high n-doping of the nanowire core with Sn, and simultaneous C-doping of the radial overgrowth. These results demonstrate that the use of alternative seed particle metals is a potentially important area to explore for developing nanowire materials with controlled material properties.
authors.affiliation: †Solid State Physics and ‡Center for Analysis and Synthesis, Lund University, S-221 00 Lund, Sweden.
authors.forename: Rong
authors.initials: R
authors.lastname: Sun
authors.affiliation: †Solid State Physics and ‡Center for Analysis and Synthesis, Lund University, S-221 00 Lund, Sweden.
authors.forename: Daniel
authors.initials: D
authors.lastname: Jacobsson
authors.affiliation: †Solid State Physics and ‡Center for Analysis and Synthesis, Lund University, S-221 00 Lund, Sweden.
authors.forename: I-Ju
authors.initials: IJ
authors.lastname: Chen
authors.affiliation: †Solid State Physics and ‡Center for Analysis and Synthesis, Lund University, S-221 00 Lund, Sweden.
authors.forename: Malin
authors.initials: M
authors.lastname: Nilsson
authors.affiliation: †Solid State Physics and ‡Center for Analysis and Synthesis, Lund University, S-221 00 Lund, Sweden.
authors.forename: Claes
authors.initials: C
authors.lastname: Thelander
authors.affiliation: †Solid State Physics and ‡Center for Analysis and Synthesis, Lund University, S-221 00 Lund, Sweden.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Lehmann
authors.affiliation: †Solid State Physics and ‡Center for Analysis and Synthesis, Lund University, S-221 00 Lund, Sweden.
authors.forename: Kimberly A
authors.initials: KA
authors.lastname: Dick
keywords: GaAs; III−V semiconductors; Nanowires; doping; p−n junction; transmission electron microscopy; vapor-phase epitaxy