The thermoelectric properties of solid solutions of the type b-K2Bi82xSbxSe13 (0,x,8) were studied with respect to thermal behavior, band gap variation, and charge transport properties as a function of x. At x values between 0 and 1.5, the energy band gap is observed to decrease ~anomalous! before it widens with increasing x values as would be expected. For selected members of the solid solutio...

Context. The interplay of thermal and bulk motion Comptonization to explain the spectral evolution of neutron star LMXBs including transient hard X-ray tails is gaining a strong theoretical and observational support. The last momentum has been given by the advent of a new XSPEC Comptonization model, COMPTB, which includes thermal and bulk Comptonization. Aims. We used COMPTB to investigate the ...

We report on the prompt and afterglow emission observations of the dark burst GRB010214 with BeppoSAX. The prompt emission shows possible evidence of variable absorption from NH = 3.0 +5.1 −2.0 × 10 cm−2 in the first 6 s of the event to a value consistent with the Galactic column density (N H = 2.66 × 10 cm−2) in the GRB direction. An X–ray afterglow emission in the 2–10 keV energy band was det...

Skutterudite materials have been considered as promising thermoelectric candidates due to intrinsically good electrical conductivity and tailorable thermal conductivity. Options for improving thermal-to-electrical conversion efficiency include identifying novel materials, adding filler atoms, and substitutional dopants. Incorporating filler or substitutional dopant atoms in the skutterudite com...

We report the fabrication of heterostructure p-MOSFETs with low-carbon Si1-xyGexCy channels. The use of low carbon fraction (y = 0.002) does not significantly affect the strain of the channel layer or the valence band offset. Small carbon fractions do improve the thermal stability of the channel region and make it possible to use conventional thermal oxidation and ion implant annealing without ...

The type III band alignment of HgTe/CdTe superlattices leads to the interesting possibility of achieving very long wavelength infrared (VLWIR) (15 μm and longer) cutoff wavelengths with either normal (HgTe layer thickness less than about 70 Å for CdTe layer thickness of 50 Å) or inverted (HgTe thickness greater than about 70 Å) band structures. The inverted band structure superlattices promise ...

Quantum-chemical calculations coupled with a tight binding band model are used to study the charge carrier mobilities in oligoacene crystals. The transfer integrals for all nonzero interactions in four crystalline oligoacenes ͑naphthalene, anthracene, tetracene, and pentacene͒ were calculated, and then used to construct the excess electron and hole band structures of all four oligoacene crystals ...

The electrical transport property of the reduced graphene oxide (rGO) thin-films synthesized from defective GO through thermal treatment in a reactive ethanol environment at high temperature above 1000 °C shows a band-like transport with small thermal activation energy (Ea~10 meV) that occurs during high carrier mobility (~210 cm(2)/Vs). Electrical and structural analysis using X-ray absorption...

Since the bandgap of metamorphic GaAsP can be tuned through a range of energies in a high-radiance region of the solar spectrum, this alloy may be useful in multi-junction solar cells. For this application, achieving high conversion efficiency will require a good understanding of the defects that accompany latticemismatch in this system. We use photoluminescence and deep-level transient spectro...