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Impact of strained silicon on the device performance of a bipolar charge plasma transistor
摘要： In this manuscript we analyze a unique approach to improve the performance of the bipolar charge plasma transistor (BCPT) by introducing a strained Si/SixGe1?x layer as the active device region. For charge plasma realization different metal work-function electrodes are used to induce n+ and p+ regions on undoped strained silicon-on-insulator (sSOI or SixGe1?x) to realize emitter, base, and collector regions of the BCPT. Here, by using a calibrated 2-D TCAD simulation the impact of a Si mole fraction x (in SixGe1?x) on device performance metrics is investigated. The analysis demonstrates the band gap lowering with decreasing Si content or effective strain on the Si layer, and its subsequent advantages. This work reports a significant improvement in current gain, cutoff frequency, and lower collector breakdown voltage (BVCEO) for the proposed structure over the conventional device. The effect of varying temperature on the strained Si layer and its implications on the device performance is also investigated. The analysis demonstrates a fair device-level understanding and exhibits the immense potential of the SixGe1?x material as the device layer. In addition to this, using extensive 2-D mixed-mode TCAD simulation, a considerable improvement in switching transient times are also observed compared to its conventional counterpart.
关键词： bipolar charge plasma transistor (BCPT),mole fraction,cutoff frequency (fT),current gain (β),collector breakdown voltage (BVCEO),strained Si layer,band gap lowering
更新于2025-09-23 15:23:52
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Effects of shape-controlling cationic and anionic surfactants on the morphology and surface resonance plasmon intensity of silver@copper bimetallic nanoparticles
摘要： Cetyltrimethylammonium bromide (CTAB) and sodium dodecyl sulfate (SDS) were used as a soft template to determine the morphology of silver@copper bimetallic nanoparticles. The subsequent addition of ascorbic acid to the Ag+, Cu2+ and surfactants solutions, leads to the formation of prefect transparent pale yellow color with in 5 min at ca. 409 nm. The visual observations and UV-visible spectra reveal that the color (pale yellow, dark brown, and wine red), surface resonance plasmon (SRP) intensity and shape of the spectra depends on the Ag+/Cu2+ molar ratio, [CTAB], and reaction time. Sub-, post- and dilution micellar effects are accountable to the fast and slow nucleation and growth processes. The morphology and SRP and rate constants for the formation of silver@copper decreases with increasing [CTAB]. The typical optical properties were dominated by the silver metal. The absence of SRP peaks at ca. 425 nm, 590 nm and 800 nm ruled out the possibility to the formation of AgNPs, CuNPs and CuO, respectively. Transmission electron microscopy (TEM) also confirms the formation of silver@copper nanoparticles. The pseudo-first order rate constants, activation energy, enthalpy of activation and entropy of activation were calculated and discussed for the degradation of methyl orange. The mole fraction of XAg = 0.50 and XCu = 0.499 were calculated in silver@copper.
关键词： silver@copper,Nanoparticles,Mole fraction,SDS,CTAB
更新于2025-09-10 09:29:36