Determination of the electronic energetics of CdTe nanoparticle assemblies on Au electrodes by photoemission, electrochemical, and photocurrent Studies

Yang Wang, Zuoti Xie, Gilad Gotesman, Lei Wang, Brian P. Bloom, Tal Z. Markus, Dan Oron, Ron Naaman*, David H. Waldeck

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

This work explores the electronic states of CdTe semiconductor nanoparticles (NPs) that are immobilized on a polycrystalline Au film through an organic linker (dithiol). The HOMO and LUMO energies of the CdTe NPs were determined by using photoelectron spectroscopy and cyclic voltammetry. The results from these measurements show that the HOMO energy is independent of the nanoparticle size and is pinned to the Fermi level, whereas the LUMO energy changes systematically with the size of the NP. Studies with different capping ligands imply that the dithiol ligand removes surface states and enhances the optoelectronic properties of the NPs.

Original languageEnglish
Pages (from-to)17464-17472
Number of pages9
JournalJournal of Physical Chemistry C
Volume116
Issue number33
DOIs
StatePublished - 23 Aug 2012
Externally publishedYes

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