Control of Exciton Confinement in Quantum Dot–Organic Complexes through Energetic Alignment of Interfacial Orbitals

This paper describes a method to control the quantum
confinement,
and therefore the energy, of excitonic holes in CdSe QDs through adsorption
of the hole-delocalizing ligand phenyldithiocarbamate, PTC, and para
substitutions of the phenyl ring of this ligand with electron-donating
or -withdrawing groups. These substitutions control hole delocalization
in the QDs through the energetic alignment of the highest occupied
orbitals of PTC with the highest density-of-states region of the CdSe
valence band, to which PTC couples selectively.