homework_2.pdf - EE121B Homework-2 Total Points 21 Required...

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1 EE121B Homework-2 Total Points: 21 Required Readings: Chapter 3,4 and worked out examples in the textbook Submit your work in a pdf file electronically in the CCLE website before Oct.15th 6pm. Late homework will not get credit! (All questions carry 3 points) 1. What do you mean by equilibrium condition in a semiconductor device? Compare it with steady-state condition. 2. (a) Write the equation for total current density (ignoring recombination) in one dimension and indicate the components: J drift,p , J drift,n , J diffusion,p , J diffusion,n . (b) Explain the concept of drift current and diffusion current. (c) How do you determine the average carrier velocity from the electric field? 3. A Si sample is doped with 10 15 cm -3 boron atoms and 2x10 15 cm -3 phosphorous atoms. Assuming 100% ionization, determine the free electron
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