Calculation of thermal parameters of SiGe microbolometers

The thermal parameters of a SiGe microbolometer were calculated using numerical modeling. The calculated thermal conduction and thermal response time are in good agreement with the values found experimentally and range between 2x10$^-7$ and 7x10$^-8$ W/K and 1.5 and 4.5 ms, respectively. High sensitivity of microbolometer is achieved due to optimization of the thermal response time and thermal conduction by fitting the geometry of supporting heat-removing legs or by selection of a suitable material providing boundary thermal resistance higher than 8x10$^-3$ cm$^2$K/W at the SiGe interface.Comment: 11 pages, 6 figure

Temperature spectra of conductance of Ge/Si p-i-n structures with Ge quantum dots

Abstract This work presents results of investigation of Ge/Si p-i-n structures with Ge quantum dots in the i-region by the method of admittance spectroscopy. The structures contain multiple layers with Ge quantum dots separated by thin 5 nm layers of Si in the intrinsic region. Two peaks are observed on the temperature dependences of conductance of the investigated heterostructures. It is revealed that the second peak is broadened and corresponds to a system of closely lying energy levels

Influence of a high-frequency pulsed nanosecond diffusion discharge in the nitrogen atmosphere on the electrical characteristics of a CdHgTe epitaxial films

The effect of a high-frequency nanosecond volume discharge forming in an inhomogeneous electrical field at atmospheric pressure on the CdHgTe (CMT) epitaxial films is studied. The measurement of the electrophysical parameters of the CMT specimens upon irradiation shows that that the action of pulses of nanosecond volume discharge leads to changes in the electrophysical properties of CMT epitaxial films due to formation of a near-surface high-conductivity layer of the n-type conduction. The preliminary results show that it is possible to use such actions in the development of technologies for the controlled change of the properties of CMT narrow-band solid solutions and production of structures heterogeneous with respect to conduction

ЭЛЕКТРОФИЗИЧЕСКИЕ И ФОТОЭЛЕКТРИЧЕСКИЕ ХАРАКТЕРИСТИКИ МДП–СТРУКТУР НА ОСНОВЕ ГЕТЕРОЭПИТАКСИАЛЬНОГО HgCdTe, ПОЛУЧЕННОГО МЕТОДОМ МОЛЕКУЛЯРНО–ЛУЧЕВОЙ ЭПИТАКСИИ, C НЕОДНОРОДНЫМ РАСПРЕДЕЛЕНИЕМ СОСТАВА

The electro-physical and photoelectrical properties of MIS structures based on HgCdTe MBE with non-uniform distribution of composition were experimentally investigated. It is shown that near-surface graded-gap layers with elevated composition strongly affect on dependencies of the capacitance and the photo-emf versus the bias voltage and frequency for the MIS structures based on n-Hg1-xCdxTe (x = 0.21—0.23). The characteristics of MIS structures based on n-Hg0.7Cd0.3Te with periodically located regions with high composition were investigated and it is shown that these regions are most strongly affect the characteristics of MIS structures when their location near the boundary of the insulator−semiconductor. The electrical properties of MIS structures based on n-Hg1-xCdxTe (x = 0.62—0.73) with region with lower composition were experimentally studied.Экспериментально исследованы электрофизические и фотоэлектрические свойства МДП-структур на основе HgCdTe, полученного методом молекулярно-лучевой эпитаксии, с неоднородным распределением состава. Показано, что для МДП-структур на основе n-Hg1-xCdxTe (x = 0,21-0,23) приповерхностные варизонные слои с увеличенным содержанием СdTe на поверхности сильно влияют на зависимости емкости и фотоЭДС от напряжения смещения и частоты. Исследованы характеристики МДП-структур на основе n-Hg0,7Cd0,3Te с периодически расположенными областями резко повышенного содержания CdTe барьерного типа и показано, что эти области оказывают влияние на характеристики МДП-структур при их расположении вблизи границы раздела диэлектрик—полупроводник. Экспериментально изучены электрические свойства МДП-структур на основе n-Hg1-xCdxTe (x = 0,62-0,73) с областями пониженного содержания CdTe в приповерхностной области типа потенциальных ям

Electron-deuteron scattering in a current-conserving description of relativistic bound states: formalism and impulse approximation calculations

The electromagnetic interactions of a relativistic two-body bound state are formulated in three dimensions using an equal-time (ET) formalism. This involves a systematic reduction of four-dimensional dynamics to a three-dimensional form by integrating out the time components of relative momenta. A conserved electromagnetic current is developed for the ET formalism. It is shown that consistent truncations of the electromagnetic current and the $NN$ interaction kernel may be made, order-by-order in the coupling constants, such that appropriate Ward-Takahashi identities are satisfied. A meson-exchange model of the $NN$ interaction is used to calculate deuteron vertex functions. Calculations of electromagnetic form factors for elastic scattering of electrons by deuterium are performed using an impulse-approximation current. Negative-energy components of the deuteron's vertex function and retardation effects in the meson-exchange interaction are found to have only minor effects on the deuteron form factors.Comment: 42 pages, RevTe