Effect of magnetic field on the reconstruction of the defect-impurity state and сathodoluminescence in Si/SiO₂ structure

Impurity states in Si/SiO₂ structure have been studied using cathodoluminescence (CL). It has been found that intrinsic structure defects in Si/SiO2 are sensitive to the action of magnetic field, which can be revealed due to changes in Si/SiO₂ optical properties. The most sensitive to magnetic field (about 35 per cent) is the intensity of the 1.9 eV CL band attributed to non-bridge oxygen atoms

Transformations of microdefect structure in silicon crystals under the influence of weak magnetic field

Quantitative characterization of complex microdefect structures in annealed silicon crystals (1150 °С, 40 h) and their transformations after exposing for one day in a weak magnetic field (1 T) has been performed by analyzing the rocking curves, which have been measured by a high-resolution double-crystal X-ray diffractometer. Based on the characterization results, which have been obtained by using the formulas of the dynamical theory of X-ray diffraction by imperfect crystals with randomly distributed microdefects of several types, the concentrations and average sizes of oxygen precipitates and dislocation loops after imposing the magnetic field and their dependences on time after its removing have been determined

Changes in nanostructure and micro-plastic properties of silicon crystals under action of magnetic fields

Experimental data obtained in this work are indicative of the fact that magnetic field stimulates processes of structural relaxation in silicon. Using the secondary-ion mass-spectrometry method, we found that the concentration of alkali metals (K, Na, Ca) in the subsurface layer is essentially (4 to 5 times) increased after magnetic impact. The carbon concentration is increased, too, while the concentration of oxygen (dominant impurity in silicon) is changed in various ways. Non-homogeneous distribution of impurities results in non-uniformity of heights for nano-objects that are formed from them, which leads to non-uniformity in micro-relief and causes a respective increase of the roughness parameter. The changes in impurity composition of silicon crystals, which are caused by the magnetic influence, correlate with changes in silicon micro-plastic characteristics. In this work, we found a positive magneto-plastic effect. Most probable, the reason for braking the dislocation motion in silicon crystals after magnetic treatment is diffusion of impurities along dislocation lines, which is enhanced by magnetic field. Coagulants of diffusing

Changes in the state of paramagnetic centers and lattice parameter of micro-structured Si under the influence of weak magnetic field

In this work, the influence of weak magnetic field on structure-dependent properties of micro-structured Si was determined. The researches of EPR-spectra inherent to micro-structured Si showed the presence of the spectral line at H ~ 3500 Oe that appears from centers with the g-factor g ~ 2.0010 (Pв – centers). Intensity of the determined spectral line decreases twice after magnetic processing. The observed redox processes and evolution of defect structure are interpreted as the influence of magnetic field on micro-structured Si. Calculations made using the data of X-ray diffractometric researches showed an essential decrease of internal strains and respective increase of the lattice parameter in micro-structured Si samples after magnetic processing in the weak magnetic field