Size-dependent single-particle energy levels and interparticle Coulomb interactions in CdSe quantum dots measured by scanning tunneling spectroscopy

Lucian Jdira, Peter Liljeroth, Eric Stoffels, Daniël Vanmaekelbergh, and Sylvia Speller

Phys. Rev. B 73, 115305 – Published 3 March 2006

Abstract

We report on tunneling spectroscopy measurements on colloidal CdSe quantum dots of different sizes. The size-dependent energy level structure and electron-hole Coulomb attraction in CdSe quantum dots are obtained by a combination of shell-tunneling spectroscopy and optical spectroscopy. The results are in good agreement with tight-binding calculations. The electron-electron interactions are investigated by shell-filling spectroscopy. The tunneling spectra in this regime are analyzed by solving the master equation for the electron and hole occupancy of the quantum dot.

Received 11 November 2005

DOI:https://doi.org/10.1103/PhysRevB.73.115305

Authors & Affiliations

Lucian Jdira¹, Peter Liljeroth², Eric Stoffels¹, Daniël Vanmaekelbergh², and Sylvia Speller¹

¹Institute for Molecules and Materials, Radboud University Nijmegen, P.O. Box 9010, 6500 GL Nijmegen, The Netherlands
²Condensed Matter and Interfaces, Debye Institute, University of Utrecht, P.O. Box 80000, 3508 TA Utrecht, The Netherlands

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Issue

Vol. 73, Iss. 11 — 15 March 2006

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Physical Review B

covering condensed matter and materials physics