This paper aims to study the behavior of a Carbon Nanotube Field Effect Transistor (CNTFET) which is one of the nanoelectronic devices and a major replacement for Complementary Metal Oxide Semiconductor (CMOS) and MOSFETs, which have a wide range of short channel effects that play a prominent role in their disadvantages and, thus, have made us today to look for a better device. One such device is CNTFET which is better in terms of execution with low power consumption, faster switching speed, high carrier mobility, and very large scale integrated circuits. The channel of this transistor is surrounded by a carbon nanotube, and this paper mainly revolves around the simulation of its current-voltage (I-V) characteristics. The efficiency of this device on the whole depends on device parameters that are shown in the simulation of CNTFET, and the geometry of this device has an excellent dominance on carrier transport and permits for superior electrostatics while the gate contact wraps throughout the channel of a carbon nanotube. A carbon nanotube used for coaxial geometry has a zigzag structure and is semiconducting in nature. To ensure the efficient execution of CNTFETs as a vital part of nanoelectronic devices, chirality factor (n, m) values play an important role whose effect is shown on drain current. Further, the source/drain doping level variations that affect drain current are inspected. Also, I-V characteristics at different temperature conditions are examined which indirectly gives us an idea of the movement of electrons in this device with respect to change in temperature. Additionally, the analysis is also made to see the effect of nanotube length, coaxial gate voltage and gate thickness on I-V characteristics and also to reveal the impact of high-k materials on I-V characteristics.
This paper investigates the simulation and performance of Tunnel field effect transistor (TFET) with a nanocavity in it, which can be used for bio sensing application. The entire simulation is done using the tool Silvaco Atlas TCAD. This paper mainly aims in comparing the different parameters for few biomolecules which has different dielectric constant values, namely Streptavidin, Biotin, APTES, Cellulose and DNA. The device structure here consists of a nanocavity near the source end, which is used to place these biomolecules and hence observe the variation of the Drain current v/s Gate voltage characteristic graph, these biomolecules that are having unique dielectric constants are placed within this cavity and these graphs are observed. The energy band diagram of this device is obtained; on top of this various other parameters namely Surface Potential, Electric field are observed for the above-mentioned Biomolecules. The Length of the cavity of the biosensor is also varied to observe the difference, in addition to this Ion (ON current) variation is plotted for the change in the dielectric constant of the biomolecule.
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