Built-in potential and charge distribution within single heterostructured nanorods measured by scanning Kelvin probe microscopy. Journal Article uri icon

Overview

abstract

  • The electrostatic potential distribution across single, isolated, colloidal heterostructured nanorods (NRs) with component materials expected to form a p-n junction within each NR has been measured using scanning Kelvin probe microscopy (SKPM). We compare CdS to bicomponent CdS-CdSe, CdS-PbSe, and CdS-PbS NRs prepared via different synthetic approaches to corroborate the SKPM assignments. The CdS-PbS NRs show a sharp contrast in measured potential across the material interface. We find the measured built-in potential within an individual NR to be attenuated by long-range electrostatic forces between the sample substrate, cantilever, and the measuring tip. Surface potential images were deconvoluted to yield built-in potentials ranging from 375 to 510 meV in the heterostructured NRs. We deduce the overall built-in potential as well as the charge distribution across each segment of the heterostructured NRs by combining SKPM data with simulations of the system.

publication date

  • March 1, 2013

Full Author List

  • Nanayakkara SU; Cohen G; Jiang CS; Romero MJ; Maturova K; Al-Jassim M; van de Lagemaat J; Rosenwaks Y; Luther JM

Other Profiles

Additional Document Info

start page

  • 1278

end page

  • 1284

volume

  • 13

issue

  • 3