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646s10hw4g - Hint for(b use the SHR equation and neglect p...

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ELEG 646 ; ELEG 446 - Nanoelectronic Device Principles Spring 2010 Homework #4 - due Tuesday, 23 March 2009, in class 1. A Silicon sample with 10 15 cm -3 donors is uniformly optically excited at room temperature such that 10 19 cm -3 electron hole pairs are generated per second. Find the separation of the quasi- Fermi levels and the change in conductivity (i.e. the photoconductivity) upon shining the light. Electron and hole lifetimes are both 10 μsec, and D p = 12 cm 2 -s -1 . 2. Problem 5.1 in chapter 5, Muller & Kamins, p. 274 in 3rd edition.
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Unformatted text preview: Hint for (b): use the SHR equation and neglect p and n terms only if they are relatively small. 3. Problem 5.2 in chapter 5, Muller & Kamins, p. 274 in 3rd edition. Hint: neglect only relatively small terms and assume low level injection. Homework assignments will appear on the web at: http://www.ece.udel.edu/~kolodzey/courses/eleg646s10.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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