Quantum rate as a spectroscopic methodology for measuring the electronic structure of quantum dots

Abstract

The electronic structure of nanoscale moieties (such as molecules and quantum dots) governs the properties and performance of the bottom-up fabricated devices based on their assemblies. Accordingly, simple and faster experimental methods to resolve the electronic density of states of these nanoscale materials (of which quantum dots are a particular example) are of great importance for the development of man-made nanoscale interfaces and nanoelectronics. In the present work, we propose the quantum rate spectroscopy methodology (and introduce the fundamental physical basis of this technique that was previously demonstrated for measuring the electronic structure of two-dimensional compounds such as graphene) as a tool for resolving the electronic structure of zero-dimensional (quantum dot) structures at room temperature and environmental pressure conditions. This method is simpler than the traditional methods based on scanning tunneling microscopy. This spectroscopic approach based on the quantum rate theory was demonstrated for CdTe quantum dots and was used to measure a spectrum that provides discrete energy levels that are consistent with those obtained by tunneling microscopy measurements.