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



  • 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 13, 2013

has restriction

  • closed

Date in CU Experts

  • March 13, 2015 11:27 AM

Full Author List

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

author count

  • 9

Other Profiles

Electronic International Standard Serial Number (EISSN)

  • 1530-6992

Additional Document Info

start page

  • 1278

end page

  • 1284


  • 13


  • 3