Published in Technical Physics Letters
AbstractIsoperiodic GaxIn1 –xSbyAszP1 –y–z/InP heterostructures for the operation at a wavelength of 1.06–1.60 μm are obtained using the method of zone crystallization with a temperature gradient. An absolute spectral sensitivity of about 0.59 A/W and a response time of about 10 ns are achieved. The threshold sensitivity of the created photodiodes ...
Published in Technical Physics Letters
AbstractThe viscosity of a rarefied gas in nanochannels under normal conditions is studied. The viscosity coefficient is calculated from the Green–Kubo formula using the stochastic molecular method. The interaction of gas molecules with the wall is described by the specular, diffuse, or specular-diffuse laws. Gas temperature and channel height are ...
Published in Technical Physics Letters
AbstractAn increase in the reflection in the IR spectral range typical of a plasmon resonance in single crystals is observed in an InSb film formed by thermal evaporation in a vacuum on a CdS single crystal. Raman spectra demonstrate an approximately constant ratio between the amorphous and crystalline phases for InSb films on a CdS substrate, whic...
Published in Technical Physics Letters
AbstractIt is shown using Mössbauer spectroscopy on 119Sn, 121Sb, and 125Te isotopes that the local structure of germanium atoms changes during crystallization of amorphous Ge2Sb2Te5 films (tetrahedral symmetry changes to the octahedral one), whereas the environment of antimony and tellurium atoms remains the same (the environment of antimony atoms...
Published in Technical Physics Letters
AbstractMethods for passivation and protection of p–n junctions at places of their emergence at the lateral surface of a mesa structure and for sealing-off of multijunction solar cells based on a GaInP/GaAs/Ge structure have been studied. Protective coatings based on silicon nitride and silicone layers were examined by analyzing dark current–voltag...
Published in Technical Physics Letters
AbstractWe have investigated the effect of the finishing layer of carbon fibers on the appearance of the triple-shape memory effect of polyurethane carbon fiber. Structural changes in a polyurethane sample reinforced with finished carbon fiber were determined using thermomodulated differential scanning calorimetry. The effect of the diffusion adhes...
Published in Technical Physics Letters
AbstractA technique for obtaining carbon nanotubes (CNTs) doped with nitrogen in ammonia plasma has been developed. In this technique, CNTs synthesized by a method excluding their doping with nitrogen are post-treated in ammonia plasma. This treatment leads to a more than fivefold increase in the concentration of nitrogen (from 0.7 to 3.6 at %), a ...
Published in Technical Physics Letters
AbstractA method for coating of a profiled Si surface with a SiC layer, which completely retains the initial morphology of the Si surface, is developed. The SiC synthesis conditions are determined at which the initial profile of the Si surface is transformed into a profile coated with a SiC layer without geometric distortions. It is confirmed exper...
Published in Technical Physics Letters
AbstractThe first investigation devoted to experimental modeling of the lift of dust particles by shock wave over a target surface has been performed on the Saturn setup for studying the interaction of laser radiation with a porous chondritic target surface bearing finely dispersed talc particles. Results of experimental modeling can be used to des...
Published in Technical Physics Letters
AbstractThe problem of calculation of Kapitza contact thermal resistances between different materials is very urgent in view of the development of various nanosystems (computer electronic circuits, thermoelectric devices, quantum cascade lasers, etc.). An improved acoustic mismatch model is proposed for calculating Kapitza conductivities. A drawbac...
