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Electrical Current Characteristics of Simulated Carbon Nanotube Network Field Effect Transistors

POSTER

Abstract

\begin{figure}[htbp] \centerline{\includegraphics[width=0.32in,height=0.33in]{270920191.eps}} \label{fig1} \end{figure} \begin{figure}[htbp] \centerline{\includegraphics[width=0.25in,height=0.25in]{270920192.eps}} \label{fig2} \end{figure} \begin{figure}[htbp] \centerline{\includegraphics[width=0.32in,height=0.33in]{270920193.eps}} \label{fig3} \end{figure} \begin{figure}[htbp] \centerline{\includegraphics[width=0.25in,height=0.25in]{270920194.eps}} \label{fig4} \end{figure} \begin{figure}[htbp] \centerline{\includegraphics[width=0.32in,height=0.33in]{270920195.eps}} \label{fig5} \end{figure} \begin{figure}[htbp] \centerline{\includegraphics[width=0.25in,height=0.25in]{270920196.eps}} \label{fig6} \end{figure} \begin{figure}[htbp] \centerline{\includegraphics[width=0.32in,height=0.33in]{270920197.eps}} \label{fig7} \end{figure} \begin{figure}[htbp] \centerline{\includegraphics[width=0.25in,height=0.25in]{270920198.eps}} \label{fig8} \end{figure} Carbon nanotube (CNT) network field effect transistors (FETs) offer a promising method for creating biosensors. Sensing occurs due to electrostatic gating which impacts the metallic-semiconducting (m-s) junctions in particular, and is heavily influenced by the morphology of the CNT network. Using a simulated random stick network, we assigned sticks to be either metallic (m) or semiconducting (s) with ratios and densities similar to actual devices and simulated electrostatic gating at each m-s junction in the network. For biosensing applications CNT FETs should have optimized sensitivity. However, it is not fully understood how a network's morphological parameters impact its overall network sensitivity. Using our simulation, we mapped sensitivity as the impact of gating each m-s junction within the network to the overall change in network current. This process was done for multiple simulated networks of varying tube densities. Our results showed that not all m-s junctions influence the network the same, and allowed us to determine which m-s junctions act. In addition, we verified that m-s junctions most influence the network response when the networks are of low density affirming that sparse networks have higher sensitivity.

Authors

  • James Raj

    California Polytechnic State University

  • Antara Bhattacharya

    SLAC National Accelerator Laboratory, Department of Physics, University of Nevada, Reno, 89557, USA, School of Mathematics and Physics, the University of Queensland, Brisbane, QLD 4072, Australia, University of California, Berkeley, National Institute for Materials Science, Lawrence Berkeley National Lab, Chemical Engineering, Stanford University, Santa Clara University, Lawrence Livermore National Laboratory, University of California San Diego, University of Nevada, Reno, Nihon University, Osaka U., LLNL, SLAC, U. of Nevada, Reno, California State University, Chico, Lawrence Livermore National Laboratory; UC, Irvine, Chemical Engineering and Materials Science, University of Minnesota Twin Cities, Physics, California Polytechnic State University, San Luis Obispo, Oak Ridge National Lab, Department of Physics, California Polytechnic State University, San Luis Obispo, CA 93407, USA, School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington 6021, New Zealand, California Polytechnic State University, University of California, Santa Barbara, Department of Physics, California Polytechnic State University, Victoria University of Wellington, Palo Alto High School, Palo Alto, CA, Navy Children School, Mumbai, Maharashtra, India

  • Antara Bhattacharya

    SLAC National Accelerator Laboratory, Department of Physics, University of Nevada, Reno, 89557, USA, School of Mathematics and Physics, the University of Queensland, Brisbane, QLD 4072, Australia, University of California, Berkeley, National Institute for Materials Science, Lawrence Berkeley National Lab, Chemical Engineering, Stanford University, Santa Clara University, Lawrence Livermore National Laboratory, University of California San Diego, University of Nevada, Reno, Nihon University, Osaka U., LLNL, SLAC, U. of Nevada, Reno, California State University, Chico, Lawrence Livermore National Laboratory; UC, Irvine, Chemical Engineering and Materials Science, University of Minnesota Twin Cities, Physics, California Polytechnic State University, San Luis Obispo, Oak Ridge National Lab, Department of Physics, California Polytechnic State University, San Luis Obispo, CA 93407, USA, School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington 6021, New Zealand, California Polytechnic State University, University of California, Santa Barbara, Department of Physics, California Polytechnic State University, Victoria University of Wellington, Palo Alto High School, Palo Alto, CA, Navy Children School, Mumbai, Maharashtra, India