Review copy ± not for distribution (pss-logo will be inserted here by the publisher) pss-­‐Header will be provided by the publisher 1 Introduction The continuous random network (CRN) has become the accepted model for homogeneously disordered materials, and for good reason: such atomistic models reproduce the experimentally observed properties of the materials, including some of the finer detail...

We study the spatial distribution of minority carriers arising from their anomalous photon-assisted diffusion upon photo-excitation at an edge of n-InP slab for temperatures ranging from 300K to 78K. The experiment provides a realization of the “Lévy flight” random walk of holes, in which the Lévy distribution index γ is controlled by the temperature. We show that the variation γ(T ) is close t...

This work reports a growth process for tuning the formation pathway and final composition of kesterite Cu2ZnSnSe4 (CZTSe) thin film absorbers. By adjusting as-grown precursor, can be started in Cu-rich, stoichiometric, or Cu-poor environment. During high-temperature stage annealing process, incorporation loss SnSe2–x vapor at layer is used to achieve an in-process shift during further (e.g., Cu...

The Urbach tail in crystalline GaAs and Si due to thermal vibration is evaluated in the temperature range 0—810 K. Recent experiments suggest that there is no thermally induced Urbach tail in undoped GaAs. This is most unexpected since thermally induced tails at the absorption edge having the Urbach form and widths Eo(T) linear in T are observed in a wide range of crystalline and amorphous semi...

We study a specific type of lifetime broadening resulting in the well-known exponential "Urbach tail" density of states within the energy gap of an insulator. After establishing the frequency and temperature dependence of the Urbach edge in GaAs quantum wells, we show that the broadening due to the zero-point optical phonons is the fundamental limit to the Urbach slope in high-quality samples. ...

agh darreh tailing dam located in 23 km north of takab, west azarbayjan province is used for disposal of mine tailings. the tailing dam and its reservoir were constructed on gypsiferous marlstones. this is emphasis on geotechnical and environmental importance of the site. although construction of dams on gypsum rocks were not yet prohibited, but the dissolution of gypsum in contact with water i...

The radiation damage induced in cerium dioxide CeO2 and cerium-gadolinium mixed oxides (Ce, Gd)O2-x was studied by micro-Raman spectroscopy diffuse UV-visible reflectance spectroscopy. Sintered samples of undoped for 1 mol% 5 Gd2O3 were irradiated at room temperature with 2.5-MeV Ar2+ 12-MeV Ar4+ ions up to high fluences (i.e. × 1014 cm−2 2.1 respectively). Raman spectra show that no amorphizat...