Chapter 18: Problem 22
Is it possible for compound semiconductors to exhibit intrinsic behavior? Explain your answer.
Chapter 18: Problem 22
Is it possible for compound semiconductors to exhibit intrinsic behavior? Explain your answer.
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Get started for freeTin bronze has a composition of \(92 \mathrm{wt} \% \mathrm{Cu}\) and \(8 \mathrm{wt} \% \mathrm{Sn}\), and consists of two phases at room temperature: an \(\alpha\) phase, which is copper containing a very small amount of tin in solid solution, and an \(\epsilon\) phase, which consists of approximately 37 wt \(\%\) Sn. Compute the room temperature conductivity of this alloy given the following data: \begin{tabular}{ccc} \hline \multicolumn{2}{c}{ Electrical } \\ Phase & Resistivity \((\Omega \cdot m)\) & Density \(\left(g / c m^{5}\right)\) \\\ \hline\(\alpha\) & \(1.88 \times 10^{-8}\) & \(8.94\) \\ \(\epsilon\) & \(5.32 \times 10^{-7}\) & \(8.25\) \\ \hline \end{tabular}
Estimate the temperature at which GaAs has an electrical conductivity of \(3.7 \times 10^{-3}\) \((\Omega \cdot \mathrm{m})^{-1}\), assuming the temperature dependence for \(\sigma\) of Equation 18.36. The data shown in Table \(18.3\) may prove helpful.
(a) Calculate the number of free electrons per cubic meter for gold, assuming that there are \(1.5\) free electrons per gold atom. The electrical conductivity and density for Au are \(4.3 \times 10^{7}(\Omega \cdot \mathrm{m})^{-1}\) and \(19.32 \mathrm{~g} / \mathrm{cm}^{3}\), respectively. (b) Now compute the electron mobility for \(\mathrm{Au}\).
The polarization \(P\) of a dielectric material positioned within a parallel- plate capacitor is to be \(1.0 \times 10^{-6} \mathrm{C} / \mathrm{m}^{2}\) (a) What must be the dielectric constant if an electric field of \(5 \times 10^{4} \mathrm{~V} / \mathrm{m}\) is applied? (b) What will be the dielectric displacement \(D ?\)
Cite the differences in operation and application for junction transistors and MOSFETs.
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