Assignment_2

Assignment_2 - L/C O at a few f values(e.g f=0 0.4 0.8 What...

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Assignment 2. Due before Tutorial on Tuesday May 25, 5:30pm. You can also turn it in before Monday’s class starts. 1. In the graph at right, I drew [1,1,0] direction and (1,1,0) plane. Please draw (1,2,0) plane, [1,2,0] direction; and [1, -2, 0] direction, (1, -2, 0) plane. (note that the lines should be perpendicular to the corresponding planes.) 2, 3, 4, 5 Do the following 4 problems in the textbook.
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6. In the slide we showed the dopant concentration in the solidified silicon as a function of fraction of melt solidified (graph at the right). Please draw the curve for the remaining melt for Phosphorous (i.e. draw C L /C O vs. faction of melt solidified). k o =0.35, you can draw the curve by calculating C
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Unformatted text preview: L /C O at a few f values (e.g. f=0, 0.4, 0.8). What would be C L /C O at f=1? 7. Show that for CZ growth, the total amount of impurity is conserved (i.e. ∫ C s dV s =C o V o .). 8. Short calculations. (1) If the temperature gradient in CZ silicon is 100 o C/cm, calculate the maximum pull rate. (2) For zone refining of phosphorus with multiple passes, what is the doping concentration at the beginning of the boule (i.e. x=0) after 5 passes? (3) For zone refining (single or multiple passes), assume the boule is infinitely long, what is the impurity concentration in the melt (i.e. C L /C o ) for x>>>L? (e.g. x=1000L, assume k o =0.1)...
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This note was uploaded on 08/12/2010 for the course NE NE 343 taught by Professor Bo during the Spring '10 term at Waterloo.

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Assignment_2 - L/C O at a few f values(e.g f=0 0.4 0.8 What...

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