On the evaluation of Schottky barrier diode parameters of Pd, Au and Ag/n-GaAs

340-343<span style="font-size: 16.0pt;mso-bidi-font-size:9.0pt;font-family:" times="" new="" roman","serif""="">Forward Voltage - Current <span style="font-size:15.0pt;mso-bidi-font-size: 8.0pt;font-family:" arial","sans-serif""="">(V- I) characteristics are generally used to investigate the Schottky barrier diode parameters, viz., barrier height, ideality factor and series resistance. This method requires a linear region <span style="font-size:15.0pt;mso-bidi-font-size:8.0pt; font-family:" arial","sans-serif""="">(v <span style="font-size:13.0pt; mso-bidi-font-size:6.0pt;font-family:" arial","sans-serif""="">> 3kT l q) <span style="font-size:16.0pt;mso-bidi-font-size:9.0pt;font-family: " times="" new="" roman","serif""="">in the In <span style="font-size:14.5pt; mso-bidi-font-size:7.5pt;font-family:" times="" new="" roman","serif""="">(I) vs V characteristics. When a metal-semiconductor con tact exhibits relatively high series resistance, it is difficult to determine a linear region in these forward characteristics. Therefore, one can also consider the reverse part of the <span style="font-size:15.0pt;mso-bidi-font-size:8.0pt; font-family:" arial","sans-serif""="">VI <span style="font-size:16.0pt; mso-bidi-font-size:9.0pt;font-family:" times="" new="" roman","serif""="">characteristics.  Investigations are reponed here on Pd, Au and Ag/n-GaAs Schottky barrier diode parameters under the whole bias range of <span style="font-size:16.0pt;mso-bidi-font-size:9.0pt; line-height:115%;font-family:" times="" new="" roman","serif""="">the <span style="font-size:15.0pt;mso-bidi-font-size:8.0pt;line-height:115%;font-family: " arial","sans-serif""="">VI <span style="font-size:16.0pt;mso-bidi-font-size: 9.0pt;line-height:115%;font-family:" times="" new="" roman","serif""="">characteristics. The theoretical and experimental results are compared and discussed. </span

Compressed data cubes for OLAP aggregate query approximation on continuous dimensions

Efficiently answering decision support queries is an important problem. Most of the work in this direction has been in the context of the data cube. Queries are efficiently answered by pre-computing large parts of the cube. Besides having large space requirements, such pre-computation requires that the hierarchy along each dimension be fixed (hence dimensions are categorical or prediscretized). Queries that take advantage of pre-computation can thus only drill-down or roll-up along this fixed hierarchy. Another disadvantage of existing pre-computation techniques is that the target measure, along with the aggregation function of interest, is fixed for each cube. Queries over more than one target measure or using different aggregation functions, would require pre-computing larger data cubes. In this paper, we propose a new compressed representation of the data cube that (a) drastically reduces storag

Studies of structural, third order nonlinear optical and laser damage threshold properties of diethylammonium p-hydroxybenzoate single crystal

Diethylammonium p-hydroxybenzoate (DEPH) single crystals were grown by a slow evaporation solution growth technique. High-resolution X-ray diffraction rocking curve measurements revealed the crystalline perfection of the grown crystals and the absence of structural grain boundaries. UV-visible transmission studies revealed the lower optical cut-off wavelength of the DEPH crystals. Third order nonlinear refractive index (n (2)), nonlinear absorption coefficient (beta) and susceptibility (chi (3)) parameters were estimated by Z-scan studies. The single- and multiple-shot laser damage threshold values of the grown crystals were found to be 7.1 and 6.9 GW/cm(2) using a Nd:YAG laser

Influence of Te impurity on morphology of GaSb epilayer grown on GaSb (001) patterned substrate by liquid phase epitaxy

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Growth, structural, optical and laser damage threshold studies of organic picolinium picrate monohydrate single crystals

Picolinium picrate monohydrate (PPM), an organic optical material, was synthesized and single crystals were grown by slow evaporation solution technique. The cell parameters of PPM were confirmed by single crystal X-ray diffraction analysis. The PPM crystals were subjected to FT-IR spectral analyses to confirm the synthesized compound. UV-vis-NIR spectral studies revealed that the optical transparency window of PPM crystal spreads over in the visible and NIR (480-900 nm) regions. From the transmittance data, the optical band gap as function of photon energy was estimated. The microhardness studies were carried out on PPM crystal. The laser damage threshold of PPM crystal was measured using Nd:YAG laser

GROWTH AND CHARACTERIZATION OF A NEW SEMI-ORGANIC NON-LINEAR OPTICAL CRYSTAL L-ARGININE HYDROCHLOROFLUORIDE MONOHYDRATE (LAHClF)

A new non-linear optical mixed crystal of L-arginine hydrochlorofluoride monohydrate (LAHClF) has been grown by temperature lowering solution growth technique. The single crystal X-ray diffraction studies show that the LAHClF belongs to monoclinic crystal system. The optical transmittance of the crystal was studied by UV–Visible–NIR spectroscopy. Fourier transform infrared spectroscopy and thermal analysis were performed to study the molecular vibrations and thermal behavior of the crystals, respectively. The second harmonic generation intensity and laser damage threshold of the LAHClF crystal were measured. The mechanical strength of the material was determined by the Vickers hardness method.NLO crystal, LAHClF, Vickers hardness, SHG intensity