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867f09hw4 - 2 Problem 3.4 from Rieke p 77 Only do for N A =...

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ELEG 867 - Devices for Light Detection from the Submillimeter to the Ultraviolet – Fall 2009 Homework #4 - due Friday, 2 October 2009, in class ( note – Quiz 2 will be Wednesday, 9/30, not Monday 9/28 ) Extrinsic Photodetectors and Photodiodes 1. Problem 3.3, from Rieke, p. 77. Just compare dark currents at T = 4K and 77K only. Hints: (1) assume that the dopant ionization energy is 15 meV for the extrinsic devices, and (2) assume that m* = 1 m e in N C , N V for calculating the intrinsic concentration n i in terms of bandgap, as for example in Eqn. (4.34).
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Unformatted text preview: 2. Problem 3.4, from Rieke, p. 77. Only do for N A = 10 13 and 10 14 cm-3 . Note: Gain = M (multiplication factor) in Eqn (3.12). For the relative responsivity, use the gain x quantum efficiency product. 3. Problem 4.1, from Rieke, p. 113. Homework assignments will appear on the web at: http://www.ece.udel.edu/~kolodzey/courses/eleg867f09.html. Note: On each homework and report submission, please give your name, the due date, assignment number and the course number....
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