Estimate the temperature at which GaAs has an electrical conductivity of 3.7 3 1023 (V-m)21 assuming the temperature dependence for of Equation 18.36. The data shown in Table 18.3 might prove helpful.

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E, 2kT CT-Pexp(-T) (18.36) Electrical Band Gap (eV) Conductivity 1(2-m)- Hole Mobility (m²/V-s) Electron Mobility (m/V-s) Material Elemental 4 x 10-4 2.2 Si Ge 0.05 1.11 0.67 0.14 0.38 0.18 III-V Compounds GaP 2.25 1.42 0.03 0.85 0.015 0.04 10-6 GaAs 2 x 104 InSb 0.17 7.7 0.07 Il-VI Compounds Cas 2.40 0.03 ZnTe 2.26 0.03 0.01