Nanoelectronics & Molecular Electronics 2

The multiple scattering of electrons on LO phonons in quantum dots, included in the electronic quantum kinetic equation in the self-consistent Born approximation to the electronic self-energy, leads not only to the fast electronic energy relaxation [1,2] in these nanostructures, but also to the effect of the upconversion of electronic level occupation in quantum dots [1]. From the experimental point of view the upconversion theoretical mechanism can give an alternative explanation of the lasing of the quantum dot lasers from the higher excited electronic states.

Recent experiments have shown that the conductance of single-wall carbon nanotube (SWNT) networks is sensitive to the presence of physisorbed molecules, such as O2 and N2. However, previous calculations of the transmission function for isolated SWNTs have found physisorbed molecules have little influence on the conductance. By calculating the transmission function in the non-equilibrium Green’s function (NEGF) formalism, we show that physisorbed molecules near SWNT crossings do influence the network’s conductance.

The structural environment in organic semiconductors during and after an electronic excitation changes the conditions for the charge carriers. The knowledge of transient structures is therefore essential for a complete understanding of processes like charge separation and charge transport. These processes are exploited in functional materials for large scale technical applications and are therefore of a high technological and scientific interest. We investigated thin, polycrystalline films of perylene (C20H12, Figure A) by time resolved X-ray diffraction.

The purpose of this work was the development of principles and methods for creation of the new types of nanocomposition materials (NCM) and functional materials on the base of inorganic carbon and fluorocarbon polymeric matrices for their application as advanced resistors, electrodes of lithium chemical electrical sources, electroanalytical sensors and converters of IR-irradiation into electrical signals.