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An increased frequency band requires a more accurate pointing ability in large antenna. Accurate tracking by large antenna must be assured during changing weather conditions. However, because of the outdoor nature of their operations, and especially for those with a low natural frequency, the antenna could be severely influenced by the wind disturbances. Furthermore, it would be difficult to compensate...
We report on 2D numerical simulations of photo-response characteristic for long-wavelength HgCdTe infrared photodiodes. Effects of thickness of absorption layer on the photoresponse have been investigated. Optimal thickness of absorption layers at different absorption length and diffusion length are extracted numerically. An empirical formula is proposed to predict reasonable optimal thickness of...
A new simple carrier density approximation is proposed to take account of carrier degeneracy and conduction band non-parabolicity into the simulation of HgCdTe (Mercury Cadmium Telluride – MCT) photovoltaic devices. It demonstrates a similar accuracy to the numerical calculation of the non-parabolic Fermi–Dirac integration in the range of the reduced Fermi energy at less than 30 for both LWIR and...
An data-processing method has been developed to obtain the device parameters from the resistance-voltage (R-V) characteristics measured in long-wavelength HgCdTe photodiode.
Using a two-dimensional simulator, current collapse effect is simulated in GaN HEMTs. Dynamic picture of trapping of hot electron under gate pulse is discussed. The trapped charge may accumulate under punch-off gate voltage at gate edge drain side due to the large electric Held strain. Self-heating effect is a consequence of the current collapse.
The transient photo-generated excess minority carrier lifetime in Hg1-xCdxTe n+p junction photodetector are measured using improved photo-induced open-circuit voltage decay (OCVD) technique. The lifetimes we extracted from the decay curve of the photovoltage are from tens to hundreds ns. A comparison of the relationship between composition of Cd and minority carrier lifetime show the lifetimes become...
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