7.7. The measured thermal conductivity of germanium at 300°K is 0.63 W/°K, in a range where acoustic phonon scattering d

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7 7 The Measured Thermal Conductivity Of Germanium At 300 K Is 0 63 W K In A Range Where Acoustic Phonon Scattering D 1 (39.36 KiB) Viewed 36 times

7.7. The measured thermal conductivity of germanium at 300°K is 0.63 W/°K, in a range where acoustic phonon scattering dominates. (a) What fraction of this thermal conductivity is caused by free electrons if the free-electron density is 1017 cm-and the electron mobility is 4 x 103 cmº/V-sec? (b) What must the concentration of free electrons in germanium at 300°K be in order for the electronic contribution to the thermal conductivity to be equal to the lattice contribution? (c) The thermoelectric power corresponding to (a) is measured to be 0.46 mV/ⓇK. How far below the conduction-band edge does the Fermi level lie?