title: Laser-induced charge separation in CdSe nanowires.
abstract: A combination of electrostatic force microscopy and optical microscopy was used to investigate the charge state of individual CdSe nanowires upon local illumination with a focused laser beam. The nanowires were found to be positively charged at the excitation spot and negatively charged at the distant end(s). For high laser powers, the amount of accumulated charges increases logarithmically with the laser power. These effects are described by a diffusion-based model where the results are in good agreement with the experimentally observed effects. On the basis of this model the charge imbalance along the nanowire should establish in the course of nanoseconds. The net charge separation within homogeneous nanowires upon local illumination is of importance for several electronic devices.
authors.affiliation: Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, 20146 Hamburg, Germany.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Schäfer
authors.forename: Zhe
authors.initials: Z
authors.lastname: Wang
authors.forename: Robert
authors.initials: R
authors.lastname: Zierold
authors.forename: Tobias
authors.initials: T
authors.lastname: Kipp
authors.forename: Alf
authors.initials: A
authors.lastname: Mews
mesh_terms: D019187:Cadmium Compounds / Q000737:chemistry*; D007834:Lasers; D036103:Nanotechnology; D053770:Nanowires / Q000737:chemistry*; D010316:Particle Size; D018036:Selenium Compounds / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D019187:Cadmium Compounds; D018036:Selenium Compounds; C058667:cadmium selenide