Assignment_2

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

This preview shows pages 1–2. Sign up to view the full content.

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.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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
This is the end of the preview. Sign up to access the rest of the document.

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)...
View Full Document

## 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.

### Page1 / 2

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

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online