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The development of novel superconducting photon detectors requires the investigation of non-traditional materials to exploit their specific properties and realize novel/enhanced devices. Nd2−xCexCuO4±5 is a moderate high transition temperature cuprate superconductor exhibiting n-type conduction which properties can be changed by modifying its cerium and oxygen content. Ultra-thin films of this compound...
Diamond is studied since many years as potential radiation detector material. In the last years, there has been an increasing interest about the capability of diamond to withstand harsh working conditions including high temperature. The latter capability depending upon the large band gap and the excellent thermal properties of diamond. At ENEA C.R. Frascati, diamond detectors operating at high temperature...
Infrared sensing devices rely on narrow band gap semiconductors grown by expensive and complicated methods such as molecular beam epitaxy and chemical vapor deposition. Colloidal quantum dots (CQDs) offer a low-cost alternative to detect infrared light. In this study, we have successfully demonstrated synthesis of HgTe quantum dots, which can absorb midwave infrared (MWIR) at room temperature. The...
ZnO is a direct wide-band gap semiconductor with Eg=3.3 eV, which has high saturation velocity and is radiation tolerant as well. It can be expected being utilized for the room temperature nuclear radiation detector. In this paper, we fabricate the p+-Si/n-ZnO abrupt heterojunction and study the X-ray detection properties. The I-V characteristics were measured in the temperature range of −40 °C-40...
We have measured the spectral response of sensitive Transition Edge Sensors (NEP ∼ 10−18 W/√Hz) in the frequency range from 1 to 10 THz. The TES sensors have been developed for the SAFARI instrument on SPICA and operate at 70 mK. The sensor is placed in a horn-coupled integrating cavity. We have developed a system with a light pipe that couples radiation from a room temperature Fourier Transform Spectrometer...
We have developed a room temperature, broadband, and polarization-sensitive terahertz detector based on a p-n junction film of highly aligned and ultralong carbon nanotubes. Direct thermoelectric measurements demonstrate the photothermoelectirc nature of the detection mechanism
Polycrystalline ferroelectric modified lead titanate thin films have been deposited by pulsed laser deposition and annealed for pyroelectric infrared detection. The deposited thin films have been characterized for the temperature dependence of their pyroelectric parameters.
We present a front-side micromachined thermopile with high sensitivity in the 3-5 mum window, and discuss its application to a novel non-dispersive infrared (NDIR) CO2 gas sensor with a light source emitting collimated light. The micromachined thermopile shows a measured sensitivity of 30 mV/W and a D* of 0.3 times 108 cmradicHz/W. Using this newly fabricated thermopile, we also have successfully...
We studied the effect of halogen doping of CdTe films on Si substrates grown by MOVPE at different growth conditions. High resistivity film was obtained by adjusting the growth temperature, Te/Cd precursor flow ratio and the dopant flow-rate. The result shows resistivity of the film does not change linearly with the dopant flow-rate, but increases abruptly when the dopant flow-rate is increased beyond...
A capacitively coupled plasma reactor was used for PECVD technology, where methane was introduced into the plasma reactor through the shower head. The concentration of species in the a-C:H films were determined by RBS and ERD method. The RBS results showed the main concentrations of C in the films. The concentration of hydrogen was approximately 20 at.%. The films contain a small amount of oxygen...
Polarization reversal in a ferroelectric is accompanied by heat generation which causes a temperature rise depending on thermal boundary conditions. An adiabatic condition yields (E: electric field, D: electric displacement, C: heat capacity). The copolymer of vinylidene fluoride (VDF) and trifluoroethylene (TrFE) copolymer is expected to generate a large amount of heat because of its large remanent...
The polycrystalline samples of BaSi2, SrSi2, and LaSi were prepared by spark plasma sintering (SPS). The electrical resistivity (rho) and Seebeck coefficient (S) were measured above room temperature. The S of BaSi2 was negative and the absolute values were rather high (-669 muVK-1 at 337 K). The S of SrSi2 was positive and the absolute values were lower (118 muVK-1 at 332 K) than those of BaSi2. For...
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