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2_1_EE2 Midterm-Solutions

2_1_EE2 Midterm-Solutions - EE2Midterm Spring2009 Name 1...

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EE2 Midterm Spring 2009 1 EE 2 Midterm Spring 2009 Name:____________________________________

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EE2 Midterm Spring 2009 2 EE 2 Midterm Spring 2009 Name:____________________________________ Student ID#: ____________________________ A. You are allowed to bring in one 8 ½” x 11” sheet of paper of notes. B. Please put all the work on the test paper. C. The back page of the exam has some information you may find useful. D. Show your work! Provide clear explanations and show calculations.
EE2 Midterm Spring 2009 3 1. (10 points) What is the probability that a hole will exist at 4kT below the Fermi level (assuming that energy level does not fall inside the band gap) f hole ( E ) = 1 1 1 + e E E F kT = 1 1 1 + e 4 kT kT = 1 1 1 + e 4 = 1 0.982 0.018 2. (3 points) Is there bipolar or unipolar conduction in a p‐type semiconductor? unipolar 3. (3 points) Can a full valence band contribute to conduction? No 4. (5 points) You have material 1, intrinsic silicon, and material 2, silicon doped with 10 16 Boron and 10 16 Arsenic. Which one is more conductive and why? intrinsic is more conductive, b/c doped semi has scattering and therefore lower mobility 5.

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2_1_EE2 Midterm-Solutions - EE2Midterm Spring2009 Name 1...

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