W/°K, in a range where acoustic phonon se What fraction of this thermal conductivity is density is 10¹7 cm-3 and the ele free-electron -sec? What must the concentration of free electrons
W/°K, in a range where acoustic phonon se What fraction of this thermal conductivity is density is 10¹7 cm-3 and the ele free-electron -sec? What must the concentration of free electrons
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Transcribed Image Text: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 101" cm-³ and the electron mobility is 4x 10
cm2/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 te (a) is measured to be
0.46 mV/°K. How far below the conduction-band edge does the Fermi
level lie?
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