title: Tunable light emission from quantum-confined excitons in TiSi2-catalyzed silicon nanowires.
abstract: Visible and near-infrared photoluminescence (PL) at room temperature is reported from Si nanowires (NWs) grown by chemical vapor deposition from TiSi2 catalyst sites. NWs grown with average diameter of 20 nm were etched and oxidized to thin and passivate the wires. The PL emission blue shifted continuously with decreasing nanowire diameter. Slowed oxidation was observed for small nanowire diameters and provides a high degree of control over the emission wavelength. Transmission electron microscopy, PL, and time-resolved PL data are fully consistent with quantum confinement of charge carriers in the Si nanowire core being the source of luminescence. These light emitting nanowires could find application in future CMOS-compatible photonic devices.
authors.affiliation: Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA.
authors.forename: Alex R
authors.initials: AR
authors.lastname: Guichard
authors.forename: David N
authors.initials: DN
authors.lastname: Barsic
authors.forename: Shashank
authors.initials: S
authors.lastname: Sharma
authors.forename: Theodore I
authors.initials: TI
authors.lastname: Kamins
authors.forename: Mark L
authors.initials: ML
authors.lastname: Brongersma
mesh_terms: D002384:Catalysis; D003460:Crystallization / Q000379:methods; D007834:Lasers; D008163:Luminescent Measurements / Q000295:instrumentation*; D008422:Materials Testing; D008968:Molecular Conformation; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D045663:Quantum Dots; D012666:Semiconductors; D017640:Silicates / Q000737:chemistry*; D012825:Silicon / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
chemical_list: D017640:Silicates; C103828:titanium silicide; D014025:Titanium; D012825:Silicon