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ECE 3040 Exam 1 Solutions

ECE 3040 Exam 1 Solutions - ECE 3040 Microelectronic...

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ECE 3040 Microelectronic Circuits Spring 2006 Dr. Klein Exam 1 Instructions: (1) Closed book, closed notes. You are only permitted a calculator and a writing instrument. (2) Show all work to receive full credit. Proctor will provide additional paper on request. (3) You have 75 minutes to work. Don’t get hung up on one problem. If you get stuck, move on and come back later. (4) Each problem is worth 20 points. (5) Circle, box, or otherwise indicate your final answer. (6) Answers must be legible. (7) Calculate numerical values where possible.
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1. (a) Sketch the arrangement of atoms in the (100) plane of an FCC lattice. (b) If the lattice constant is a , what is the number of atoms per unit volume in terms of a ? (c) What is the distance between nearest-neighbor atoms in terms of a ?
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2. A wafer of silicon at room temperature is doped with N D = 1.0e17 cm -3 and N A = 5.0e14 cm -3 . Take the energy of the valence band edge E v = 0 eV. (a) Find n and p. (b) Find E i . (c) Find E F .
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