ProbSet1_ENGRI1110_09 - ENGRI 1110 Homework #1 Due Friday,...

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ENGRI 1110 Homework #1 Due Friday, September 11, 2009 NOTE: In order to make grading the homework assignments of such a large class manageable, please start your answer to each new question on a new page. In order to minimize the waste of paper, feel free to use scrap paper that has already been printed on one side. 1a. Show (using diagrams) what the band structure of a typical metal, semiconductor and insulator looks like. Make sure to label what is filled, forbidden and empty. Explain what a band gap is and show if there is any difference in band gaps between the semiconductor and the insulator by drawing the bands to a qualitative scale. How does this “physicist’s model” explain the different electronic conductivities in the three types of materials? 1b. Place the following energy amounts in order from lowest to highest: a) Energy band gap in a typical insulator b) Energy difference between states in a band c) Energy band gap of pure silicon (a semiconductor) d) Typical amount of energy at room temperature
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ProbSet1_ENGRI1110_09 - ENGRI 1110 Homework #1 Due Friday,...

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