Amorphous and Nanostructured Chalcogenides

Approximate ab initio simulations of amorphous silicon and glassy chalcogenides

A classic problem of materials theory is to understand the properties of glasses and amorphous materials. Comprehension of disordered systems requires as an initial step atomistic models (coordinates of the atoms) that reproduce the known experimental features of the material. This includes structural (diffraction) information of course, but also higher-order correlations (as from new fluctuati...

Nanostructured titania films sensitized by quantum dot chalcogenides

The optical and structural properties of cadmium and lead sulfide nanocrystals deposited on mesoporous TiO2 substrates via the successive ionic layer adsorption and reaction method were comparatively investigated by reflectance, transmittance, micro-Raman and photoluminescence measurements. Enhanced interfacial electron transfer is evidenced upon direct growth of both CdS and PbS on TiO2 throug...

Nanostructured Transition Metal Chalcogenides as Materials in Lithium Ion Batteries

Monte Carlo simulation of charge transport in amorphous chalcogenides

The I(V ) characteristics of amorphous GST devices show a peculiar S-shape behavior, that is a swift rise of the current along with a voltage snap-back. This type of characteristics led to a growing research interest in view of the future application of such materials to the manufacturing of phase-change memory devices. In this work we adopt a generalization of the variable-range hopping theory...

Microstructure of nanostructured amorphous Si-Au-alloys