• Estimation of various scattering parameters and 2-DEG mobilities from electron mobility calculations in the three conduction bands 𝛤, L and X of gallium arsenide

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      https://www.ias.ac.in/article/fulltext/pram/069/04/0687-0692b

    • Keywords

       

      GaAs; scattering; mobilities in 𝛤, L and X valleys; effective masses; deformation potential; impurity compensation and 2-DEG.

    • Abstract

       

      The electron drift mobility in 𝛤 conduction band of GaAs has been calculated before, but for the first time, we have made attempts to estimate the electron mobilities in higher energy L and X minima. We have also calculated the value of mobility of two-dimensional electron gas needed to predict hetero-structure device characteristics using GaAs. Best scattering parameters have been derived by close comparison between experimental and theoretical mobilities. Room temperature electron mobilities in 𝛤, L and X valleys are found to be nearly 9094, 945 and 247 cm2 /V-s respectively. For the above valleys, the electron masses, deformation potentials and polar phonon temperatures have been determined to be (0.067, 0.22, 0.39m 0 ), (8.5, 9.5, 6.5 eV), and (416, 382, 542 K) as best values, respectively. The 2-DEG electron mobility in 𝛤 minimum increases to $1.54 \times 10^{6}$ from $1.59 \times 10^{5}$ cm2 /V-s (for impurity concentration of 1014 cm-3) at 10 K. Similarly, the 2-DEG electron mobility values in L and X minima are estimated to be $2.28 \times 10^{5}$ and $1.44 \times 10^{5}$ cm2 /V-s at 10 K, which are about $\sim 4.5$ and $\sim 3.9$ times higher than normal value with impurity scattering present.

    • Author Affiliations

       

      Sonal Singhal1 A K Saxena1 S Dasgupta1

      1. Solid State Devices and VLSI Technology Group, Department of Electronics and Computer Engineering, Indian Institute of Technology Roorkee, Roorkee 247 667, India
    • Dates

       
  • Pramana – Journal of Physics | News

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