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# Hw4 - equals the difference between the densities of donors...

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ECE 340 Homework IV Fall 2005 Due: Friday, September 16, 2005 1. A compensated germanium sample is doped with 1x10 17 /cm 3 acceptors and 5x10 13 /cm 3 donors. (a) What is the electron and hole concentration respectively at room temperature under equilibrium conditions? Repeat for (b) 1x10 15 /cm 3 acceptors and 5x10 13 /cm 3 donors (c) 1x10 14 /cm 3 acceptors and 5x10 13 /cm 3 donors and (d) 5.1x10 13 /cm 3 acceptors and 5x10 13 /cm 3 donors. Determine the percentage of error in each case for the majority carrier concentration if one simply assumes that the majority carrier concentration approximately
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Unformatted text preview: equals the difference between the densities of donors and acceptors. 2. Repeat part (d) of problem 1 for a silicon sample. Is it OK now to assume that the majority carrier concentration approximately equals the difference between the densities of donors and acceptors? What is the percentage of error if one does so? 3. A Si bar is 0.1 cm long and 100 μm 2 in cross-sectional area. Find the current at 300 K with 10 V applied to (a) the Si bar is pure without doping and (b) the Si bar is doped with 1x10 17 /cm 3 phosphorus....
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