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ENGRI111_HW1_2007 - to return homework assignments in an...

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ENGRI 111 Homework #1 Due Monday, September 10, 2007 1. Using the "chemist's approach" of electrons in covalent bonds, explain how the substitution of a small amount of aluminum increases the conductivity of silicon. 2. Using the same model, explain how the addition of antimony increases the conductivity. 3. Repeat 1 & 2 using the "physicist's model" of electrons in bands of allowable states. 4. Distinguish between an intrinsic and an extrinsic semiconductor. (b) Explain why all real semiconductors are extrinsic at sufficiently low temperature and intrinsic at sufficiently high temperature. 5. Design a metal oxide field effect transistor with an n-type source and drain in a p- type wafer. What else is needed for the device to be operational? Explain how the transistor works. Homework Distribution Waiver Cornell University has a policy to protect students from others having access to completed assignments. Unfortunately, in a class of this size, this policy makes it difficult
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Unformatted text preview: to return homework assignments in an efficient manner. If you would like to have your homework handed back to you personally by a T.A., no action is needed on your part. Otherwise, please sign the homework waiver below which will allow you to pickup your graded assignment from a box in the MS&E lounge (Bard Hall, second floor). Please attach the waiver to this homework assignment. In order to assist in the efficient distribution of completed assignments to the entire class, I agree to pickup my completed homework assignment from an unmonitored stack of graded assignments belonging to other students in MSE 111/ENGRI 111. The homework return box is located in the MS&E lounge on the second floor of Bard Hall. Name_____________________________________ NetID_____________________________________ Signature__________________________________...
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