За первый месяц 2018 года сотрудниками кафедры и отдела микроэлектроники НИИЯФ были опубликовано несколько статей в высокорейтинговых журналах.

  • Untila G. G., Kost T. N., Chebotareva A. B. Fluorine- and tin-doped indium oxide films grown by ultrasonic spray pyrolysis: characterization and application in bifacial silicon concentrator solar cells // Solar Energy. — 2018. — Vol. 159, no. 1. — P. 173–185.  [DOI]
    Multi-wire metallization and interconnection for silicon solar cells is considered as a revolutionary technology for the next generation of photovoltaic modules, since it drastically reduces their cost while boosting efficiency. In this paper, we report results obtained using an innovative approach for the fabrication of bifacial low-concentrator Ag-free Cz-Si (Czochralski silicon) solar cells based on indium fluorine oxide (IFO)/(n+pp+)Cz-Si/indium tin oxide (ITO) structure. Transparent conductive oxide (TCO) layers, IFO and ITO, acting as antireflection electrodes, were grown by ultrasonic spray pyrolysis (USP). A copper wire contact pattern was attached by low-temperature lamination simultaneously to the front and rear TCO layers as well as to the interconnecting ribbons located outside the structure (laminated grid cell (LGCell) design). In this paper, to extend the operating range of sunlight concentration ratios of LGCells, the sheet resistance of the IFO and ITO layers has been reduced to 14 and 13 Ω/sq, respectively, by increasing their thickness by about three times, from ∼85 to ∼240 nm. As a result, the operating range of the LGCells has been extended to 1–7 suns. In the operating range, their front-illumination efficiency varies from 18.3 to 18.9% (back-illumination efficiency from 15.1 to 15.6%). We also report for the first time the results of systematic analysis of USP IFO properties and compare them with the USP ITO properties. The effect of the IFO thickness on grain size, electrical resistivity, charge carrier concentration and mobility, refractive index, transmission and absorption spectra, as well as optical band gap has been analyzed systematically by scanning electron microscopy, transmission and reflection spectra, optical ellipsometry and Hall measurements.
  • Relation between the ion flux and plasma density in an rf ccp discharge / M. Bogdanova, D. Lopaev, S. Zyryanov et al. // Plasma Sources Science and Technology. — 2018. — Vol. 27, no. 2. — P. 025003. [DOI]
    Ion flux and plasma density are some of the most essential parameters for plasma-assisted process control. There is also a simple and well-known relation between them based on the Bohm criterion. This relation allows the avoidance of directly measuring both the ion flux and the plasma density simultaneously, but the question is, how accurate this estimation would be. This work represents the study of the sensitivity of the relation to plasma conditions, such as gas pressure, type of gas and plasma density. The experiments are carried out in an asymmetric rf dual-frequency CCP discharge in noble gases—Ar and Xe—and in molecular gas—N2. The gas pressure is varied from 20 mTorr up to 200 mTorr and the plasma density range is 10^9 to 5.6 × 10^10 cm−3. Analysis of the experimental data is made by using the 2D PIC MCC model of the ion current collection by a planar electrode. The results show that there is some sensitivity of the relation to the type of gas and pressure, but the dependence of the relation on plasma density turns out to be slight. Therefore, the pressure parameterization of the relation for a certain gas can be used to establish plasma density by measuring ion current to an electrode and vice versa.
  • Silicon dioxide and low-k material sputtering in dual frequency inductive discharge by argon ions with energies from 16 to 200 ev / D. V. Lopaev, T. V. Rakhimova, A. T. Rakhimov et al. // Journal of Physics D - Applied Physics. — 2018. — Vol. 51, no. 2. — P. 02LT02. [DOI]
    Thermal and PECVD deposited silicon dioxide and organosilicate (OSG) low-k materials with porosity from 24 to 44 % and corresponding k values from 2.5 to 2.0 were sputtered in dual frequency inductive discharge by argon ions with energies from 16 to 200 eV. The film thickness was measured in process by laser ellipsometry and controlled before and after plasma treatment by spectroscopic ellipsometry. Sputtering rate and yield dependencies on ion energy were measured. It was shown that SiO2 sputtering threshold in plasma is significantly lower (< 10 eV) than the threshold measured in ion beam sputtering experiments. This is attributed to the fact that in ion beam sputtering there can be significant charging of the material surface leading to the reduction of ion energy. For low-k sputtering it is shown that the sputtering yield can be significantly higher than that of SiO2 and also –CH3 group removal by vacuum ultraviolet photons from the discharge significantly influences material sputtering rate.
  • Dmitri G., Elena M., Pavel S. Piercing of domain walls: new mechanism of gravitational radiation // Journal of High Energy Physics. — 2018. — Vol. 1, no. 120. — P. 1–42. [DOI
    Domain wall (DW) moving in media undergoes the friction force due to particle scattering. However certain particles are not scattered, but perforate the wall. As a result, the wall gets excited in the form of the branon wave, while the particle experiences an acceleration jump. This gives rise to generation of gravitational waves which we call “piercing gravitational radiation” (PGR). Though this effect is of higher order in the gravitational constant than the quadrupole radiation from the collapsing DWs, its amplitude is enhanced in the case of relativistic particles or photons because of absence of the velocity factor which is present in the quadrupole formula. We derive the spectral-angular distribution of PGR within the simplified model of the weakly gravitating particle-wall system in Minkowski space-time of arbitrary dimensions. Within this model the radiation amplitude is obtained analytically. The spectral-angular distribution of PGR in such an approach suffers from infrared and ultraviolet divergences as well as from collinear divergence in the case of a massless perforating particle. Different cut-off schemes appropriate in various dimensions are discussed. Our results are applicable both to cosmological DWs and to the braneworld models. PGR can be relevant in the infrared part of the spectrum of the relic gravitons where radiation from the collapsed DWs is damped.

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Со списком статей сотрудников кафедры в высокорейтинговых журналах за 2017 год можно ознакомиться по ссылке.

Список составлен на основании данных системы ИСТИНА. Статьи размещены в алфавитном порядке.