ECE 3040 Exam 1 Solutions07

ECE 3040 Exam 1 Solutions07 - ECE 3040 Microelectronic...

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ECE 3040 Microelectronic Circuits Spring 2007 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) Consider a BCC crystal. If the lattice constant is a, find the atomic density (number of atoms per unit volume) of the crystal. (b) Sketch the arrangement of atoms in the (110) plane of the BCC lattice. (c) Find the number of atoms per unit area in the (110) plane.
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2. A wafer of silicon is doped with N D = 5.0e16 cm -3 and N A = 1.0e16 cm -3 . Take the energy of the valence band edge E v = 0 eV. (a)
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ECE 3040 Exam 1 Solutions07 - ECE 3040 Microelectronic...

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