title: Hyperbranched lead selenide nanowire networks.
abstract: Lead chalcogenide nanostructures are good potential candidates for applications in multiexciton solar cells, infrared photodetectors, and electroluminescence devices. Here we report the synthesis and electrical measurements of hyperbranched PbSe nanowire networks. Hyperbranched PbSe nanowire networks are synthesized via a vapor-liquid-solid (VLS) mechanism. The branching is induced by continuously feeding the PbSe reactant with the vapor of a low-melting-point metal catalyst including In, Ga, and Bi. The branches show very regular orientation relationships: either perpendicular or parallel to each other. The diameter of the individual NWs depends on the size of the catalyst droplets, which can be controlled by the catalyst vapor pressure. Significantly, the hyperbranched networks can be grown epitaxially on NaCl, a low-cost substrate for future device array applications. Electrical measurements across branched NWs show the evolution of charge carrier transport with distance and degree of branching.
authors.affiliation: Department of Electrical Engineering, Stanford University, Stanford, California 94305, USA.
authors.forename: Jia
authors.initials: J
authors.lastname: Zhu
authors.forename: Hailin
authors.initials: H
authors.lastname: Peng
authors.forename: Candace K
authors.initials: CK
authors.lastname: Chan
authors.forename: Konrad
authors.initials: K
authors.lastname: Jarausch
authors.forename: Xiao Feng
authors.initials: XF
authors.lastname: Zhang
authors.forename: Yi
authors.initials: Y
authors.lastname: Cui
mesh_terms: D003460:Crystallization / Q000379:methods*; D004559:Electric Wiring; D007854:Lead / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D036103:Nanotechnology / Q000295:instrumentation / Q000379:methods*; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D018036:Selenium Compounds / Q000737:chemistry*; D012666:Semiconductors; D013499:Surface Properties
chemical_list: D046911:Macromolecular Substances; D018036:Selenium Compounds; C088065:lead selenide; D007854:Lead