Jump to main content
Jump to site search

Issue 33, 2006
Previous Article Next Article

Can scanning tunnelling spectroscopy measure the density of states of semiconductor quantum dots?

Author affiliations

Abstract

Molecules, supramolecular structures and semiconductor nanocrystals are increasingly used as the active components in prototype opto-electrical devices with miniaturized dimensions and novel functions. Therefore, there is a strong need to measure the electronic structure of such single, individual nano-objects. Here, we explore the potential of scanning tunnelling spectroscopy to obtain quantitative information on the energy levels and Coulomb interactions of semiconductor quantum dots. We discuss the conditions under which shell-tunnelling, shell-filling and bipolar spectroscopy can be performed, and illustrate this with spectra acquired on individual CdSe and PbSe quantum dots. We conclude that quantitative information on the energy levels and Coulomb interactions can be obtained if the physics of the tip/quantum dot/substrate double-barrier tunnel junction is well understood.

Graphical abstract: Can scanning tunnelling spectroscopy measure the density of states of semiconductor quantum dots?

Back to tab navigation

Publication details

The article was received on 18 Apr 2006, accepted on 24 May 2006 and first published on 02 Jun 2006


Article type: Paper
DOI: 10.1039/B605436F
Citation: Phys. Chem. Chem. Phys., 2006,8, 3845-3850

  •   Request permissions

    Can scanning tunnelling spectroscopy measure the density of states of semiconductor quantum dots?

    P. Liljeroth, L. Jdira, K. Overgaag, B. Grandidier, S. Speller and D. Vanmaekelbergh, Phys. Chem. Chem. Phys., 2006, 8, 3845
    DOI: 10.1039/B605436F

Search articles by author

Spotlight

Advertisements