Search

An examination is done on Mn-doped ZnS nanocrystals, which have shown unusual magnetization properties. In conclusion, the simple inhomogeneous doping model is capable of reproducing the experimental results and indicates that interior dopant atoms are localized within the crystal.

Research is done on nanometer sized Au clusters deposited on a silicon substrate forming Au--SiO2--Si structure which are considered important for the development of contacts in nanotechnology. In conclusion, local density of states and electron density/thickness of the interfacial layer have been extracted from the calculations to understand the evolution of metallicity of this Au-Si-O2-Si structure.

An examination is done on the electrical conductivity of mesoscopic cubic cerium oxide crystals with space charge layers along their external boundaries, which have been measured as a function of grain size. Finally, the obtained numerical results were combined with results from analytic solutions and compared with experimental data on the electrical conductivity of nanocrystalline cerium oxide.

Research is done of electronic transport in tetracene single crystals by means of space charge limited current spectroscopy and time of flight measurements. In conclusions, the results reveal that the combination of I--V calculations and time of flight spectroscopy is very effective in characterizing several different aspects of electronic transport through organic crystals.

The metallization of organic thin films is a crucial point in the development of molecular electronics. However, there is no method established yet to detect trace amounts of metal atoms in those thin films. Radiotracer measurements can quantify even very small amounts of material penetrating into the bulk, in our case less than 0.01% of a monolayer. Here, the application of this technique on two different well-characterized organic thin film systems (diindenoperylene and pentacene) is demonstrated. The results show that Ag is mainly adsorbed on the surface, but indicate that already at moderate deposition temperatures Ag can penetrate into the organic thin films and agglomerate at the film/substrate interface. [ABSTRACT FROM AUTHOR]

We have developed coherent two-dimensional (2D) fluorescence micro-spectroscopy which probes the nonlinear optical response at surfaces via fluorescence detection with sub-micron spatial resolution. This enables the investigation of microscopic variations in laterally heterogeneous film samples which are of interests for sub-wavelength opto-electronic devices.