Unformatted text preview: 17 cm-3 boron atoms and 2 x 10 16 cm-3 arsenic atoms. 4. If in a piece of silicon at 300 K the hole density is 6 x 10 15 cm-3 what is the type and density of impurities? 5. Find the location of E F relative to E i where E i is taken as the middle of the band gap for the material in problem 4. 6. Problem 6 on page 99 of the courses reader. 7. Problem 7 on page 99 in the course reader. 8. A silicon bar of length 3 mm and 200 μ m 2 cross-sectional area contains 5 x 10 18 cm-3 boron atoms. What is its resistance? (Take the hole mobility to be 125 cm 2 /V-sec.)...
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- Spring '07
- cm-3 boron atoms, Condensed matter physics