Photosensitive Structures of Conjugated Polymer - Porous Silicon

The photosensitive hybrid structures poly-3,4-ethylenedioxythiophene (PEDOT)– porous silicon (PS)–n-Si are fabricated. Current-voltage characteristics of the obtained structures are investigated. It is shown that PS surface modification by PEDOT conjugated polymer gives rise to the appearance of a pronounced rectifying effect on the current-voltage characteristics. Spectral characteristics of photoresponse in the 450–1100 nm wavelength range, its temperature dependence in the 125–325 K range, and energy characteristics of the hybrid photovoltaic structures are studied. We propose possible mechanisms of the photoelectric processes in the hybrid structures PEDOT–PS–n-Si.     

Study of the process of the hydroxo complexes formation in the Al3+-Hg2+-NO 3 − -H2O and Al3+-Cd2+-NO 3 − -H2O systems

Russian Journal of Applied Chemistry - The process of hydrolysis in the Al3+-Cd2+-NO 3 ? -H2O and Al3+-Hg2+-NO 3 ? -H2O systems is studie by the methods of pH-metric titration and...     

Features of the reverse current of a semiconductor diode with an isotypic heterojunction in the base region

The reverse current of a semiconductor diode with an isotype heterojunction in the base region with the wideband part of the junction adjoining the ohmic contact has been calculated. The dependence of the reverse current on the heterojunction position and parameters has been revealed and analyzed. It has been shown for such a diode that the reverse current associated with thermal generation of charge carriers both in the base region and at the contact can be reduced substantially. Institute of Applied Physics of the I. Franko National University of Lvov. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 7, pp. 19–23, July, 2000.     

Quantitative energy-dispersive electron probe X-ray microanalysis for single-particle analysis and its application for characterizing atmospheric aerosol particles

An energy-dispersive electron probe X-ray microanalysis (ED-EPMA) technique using an energy-dispersive X-ray detector with an ultra-thin window, designated as low-Z particle EPMA, has been developed. The low-Z particle EPMA allows the quantitative determination of concentrations of low-Z elements such as C, N and O, as well as higher-Z elements that can be analysed by conventional ED-EPMA. The quantitative determination of low-Z elements (using full Monte Carlo simulations, from the electron impact to the X-ray detection) in individual particles has improved the applicability of single-particle analysis, especially in atmospheric environmental aerosol research; many environmentally important atmospheric particles, e.g. sulphates, nitrates, ammonium and carbonaceous particles, contain low-Z elements. To demonstrate its practical applicability, the application of the low-Z particle EPMA for the characterization of Asian Dust, urban and subway aerosol particles is shown herein. In addition, it is demonstrated that the Monte Carlo calculation can also be applied in a quantitative single-particle analysis using transmission electron microscopy (TEM) coupled with energy-dispersive X-ray spectrometry (EDX), showing that the technique is useful and reliable for the characterization of submicron aerosol particles.     

Effect of small additives on the combustion of composite solid propellants

The efficiency of controlling the burning rate law of composite systems with small additives of combustion catalysts and inhibitors was experimentally studied. The combustion catalysts were colloidal and bis(dicarbollylic) complexes of transition metals and liquid ferrocene plasticizer, whereas strontium carbonate and lithium fluoride served as combustion inhibitor. Information on the regularities of action of each of the additives tested and of catalyst-inhibitor binary additives on the ballistic characteristics of composite solid propellants were obtained.     

Dual-Frequency Generation in Quantum Cascade Lasers of the 8-μm Spectral Range

Results of an investigation of quantum cascade lasers of the 8-μm spectral range generating dual-frequency radiation at room temperature are presented. The dependences of radiation intensity for two lines of laser generation obtained as a result of investigation of the generation spectra revealed the presence of saturation and decay of the long-wavelength line of generation and linear growth of the intensity of the short-wavelength one. Based on analysis of the obtained data, a mechanism of the dual-frequency generation in the studied QCL samples is proposed Generation.     

High Temperature Laser Generation of Quantum-Cascade Lasers in the Spectral Region of 8 μm

Physics of the Solid State - Abstract—In this paper, we present studies of the characteristics of quantum-cascade lasers with a generation wavelength in the region of 8 μm at high...