Size and shape dependent level structure in CdSe quantum rods

Eli Rothenberg, Taleb Mokari, Uri Banin, David Katz, Tommer Wizansky, Oded Millo

Research output: Contribution to journalConference articlepeer-review

Abstract

Optical spectroscopy and Scanning Tunneling Microscopy are used to study the size and shape dependence of the electronic states in CdSe quantum rods. The quantum rods were grown using colloidal chemistry synthesis methods, with good control over size and size distribution. Samples having average rod dimensions ranging from 10 to 60 nm in length and 3.5 to 7 nm in diameter, with aspect ratios varying between 3 to 12, were investigated. Both optical (at 10 K) and tunneling (at 4.2 K, on single rods) spectra show that the level structure depends primarily on the rod diameter and not on length. With increasing diameter, the band gap and the excited state level spacings shifted to the red. The level structure is assigned using a multi-band effective-mass model, showing relatively good agreement with experiment. We shall also discuss the effect of single electron charging on the tunneling spectra, possibly reflecting the quantum rod level degeneracy.

Original languageEnglish
Pages (from-to)217-226
Number of pages10
JournalMaterials Research Society Symposium Proceedings
Volume737
StatePublished - 25 Jul 2003
Externally publishedYes
EventQuantum Confined Semiconductor Nanostructures - Boston MA, United States
Duration: 2 Dec 20025 Dec 2002

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