Determination of the Electronic Energetics of CdTe
Nanoparticle Assemblies on Au Electrodes by Photoemission, Electrochemical,
and Photocurrent Studies
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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