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ECE340_Summ2011_HW2_Solutions - ECE 340 HW Assignment 2...

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ECE 340 HW Assignment 2 Solutions Summer 2011 1 ECE 340 Homework Assignment 2 - Solutions Due: Friday June 24 th , 2011 1. Nanohub Problem: In this problem we will be using a web-based simulation tool on the NanoHUB website (an NSF sponsored education and research resource). Go to http://nanohub.org . If you aren’t already a member, please register. For this problem we will use the Carrier Statistics Lab applet found at http://nanohub.org/resources/fermi Once the applet is launched, set the following parameters: Under the Materials and Statistics tab o Fermi-Dirac (FD) Statistics o Material: Silicon o Doping/Fermi level: Semiconductor Doping Under the temperature tab turn OFF the temperature sweep (a) [1 point] Set the acceptor concentration to 10/cm3. Simulate with two different donor concentrations: 1e+14, 1e+18/cm3. Provide the occupation function (distribution function) plot for each case. What happens to the occupation function as we increase the donor concentration? The graph on the left is for 1e14 /cm3 donors and the one on the right is for 1e18 /cm3. As we increase donor concentration, we see that the distribution moves higher up in energy.
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ECE 340 HW Assignment 2 Solutions Summer 2011 2 (b) [1 point] Set the donor concentration to 10/cm3. Simulate with two different donor concentrations: 1e+15, 1e18/cm3. Provide the occupation function (distribution function) plot for each of these cases. What happens to the occupation function as we increase the acceptor concentration?
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