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1. Write the equation for the total drift current density. Is the linear relationship between drift current density and electric field always valid? Why or why not.

1. Write the equation for the total drift current density. Is the linear relationship between drift current density and electric field always valid? Why or why not.

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REVIEW QUESTIONS 1. Write the equation for the total drift current density. Is the linear relationship between drift current density and electric field always valid? Why or why not. 2. Define electron and hole mobility. What is the unit of mobility? 3. Explain the temperature dependence of mobility. Why is the carrier mobility a function of the ionized impurity concentrations? 4. Define conductivity. Define resistivity. What are the units of conductivity and resistivity? 5. Sketch the drift velocity of electrons in silicon versus electric field. Repeat for GaAs. 6. Write the equations for the diffusion current densities of electrons and holes. 7. What is the Einstein relation? 8. What is the direction of the induce electric field in a semiconductor with a graded donor impurity concentration? Repeat for a graded acceptor impurity concentration. 9. Describe the Hall effect. 10. Explain why the polarity of the Hall voltage changes depending on the conductivity type (n type or p type) of the semiconductor.
Transcribed Image Text:REVIEW QUESTIONS 1. Write the equation for the total drift current density. Is the linear relationship between drift current density and electric field always valid? Why or why not. 2. Define electron and hole mobility. What is the unit of mobility? 3. Explain the temperature dependence of mobility. Why is the carrier mobility a function of the ionized impurity concentrations? 4. Define conductivity. Define resistivity. What are the units of conductivity and resistivity? 5. Sketch the drift velocity of electrons in silicon versus electric field. Repeat for GaAs. 6. Write the equations for the diffusion current densities of electrons and holes. 7. What is the Einstein relation? 8. What is the direction of the induce electric field in a semiconductor with a graded donor impurity concentration? Repeat for a graded acceptor impurity concentration. 9. Describe the Hall effect. 10. Explain why the polarity of the Hall voltage changes depending on the conductivity type (n type or p type) of the semiconductor.
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