Chapter 18: Problem 6
What is the distinction between electronic and ionic conduction?
Chapter 18: Problem 6
What is the distinction between electronic and ionic conduction?
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Get started for free(a) In your own words, explain how donor impurities in semiconductors give rise to free electrons in numbers in excess of those generated by valence band-conduction band excitations. (b) Also explain how acceptor impurities give rise to holes in numbers in excess of those generated by valence band- conduction band excitations.
For \(\mathrm{NaCl}\), the ionic radii for \(\mathrm{Na}^{+}\)and \(\mathrm{Cl}^{-}\) ions are \(0.102\) and \(0.181 \mathrm{~nm}\), respectively. If an externally applied electric field produces a \(5 \%\) expansion of the lattice, compute the dipole moment for each \(\mathrm{Na}^{+}-\mathrm{Cl}^{-}\)pair. Assume that this material is completely unpolarized in the absence of an electric field.
(a) Calculate the drift velocity of electrons in germanium at room temperature and when the magnitude of the electric field is \(1000 \mathrm{~V} / \mathrm{m}\). (b) Under these circumstances, how long does it take an electron to traverse a \(25-\mathrm{mm}\) (1-in.) length of crystal?
Compare the temperature dependence of the conductivity for metals and intrinsic semiconductors. Briefly explain the difference in behavior.
A charge of \(3.5 \times 10^{-11} \mathrm{C}\) is to be stored on each plate of a parallel-plate capacitor having an area of \(160 \mathrm{~mm}^{2}\left(0.25 \mathrm{in} .^{2}\right)\) and a plate separation of \(3.5 \mathrm{~mm}(0.14 \mathrm{in}\).). (a) What voltage is required if a material having a dielectric constant of \(5.0\) is positioned within the plates? (b) What voltage would be required if a vacuum were used? (c) What are the capacitances for parts (a) and (b)? (d) Compute the dielectric displacement for part (a). (e) Compute the polarization for part (a).
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