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  • Title: Doping GaP Core-Shell Nanowire pn-Junctions: A Study by Off-Axis Electron Holography.
    Author: Yazdi S, Berg A, Borgström MT, Kasama T, Beleggia M, Samuelson L, Wagner JB.
    Journal: Small; 2015 Jun 10; 11(22):2687-95. PubMed ID: 25656570.
    Abstract:
    The doping process in GaP core-shell nanowire pn-junctions using different precursors is evaluated by mapping the nanowires' electrostatic potential distribution by means of off-axis electron holography. Three precursors, triethyltin (TESn), ditertiarybutylselenide, and silane are investigated for n-type doping of nanowire shells; among them, TESn is shown to be the most efficient precursor. Off-axis electron holography reveals higher electrostatic potentials in the regions of nanowire cores grown by the vapor-liquid-solid (VLS) mechanism (axial growth) than the regions grown parasitically by the vapor-solid (VS) mechanism (radial growth), attributed to different incorporation efficiency between VLS and VS of unintentional p-type carbon doping originating from the trimethylgallium precursor. This study shows that off-axis electron holography of doped nanowires is unique in terms of the ability to map the electrostatic potential and thereby the active dopant distribution with high spatial resolution.
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