ECE331_midterm2_solns

ECE331_midterm2_solns - ECE 331: Midterm II, May 5, 2008 ti...

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Unformatted text preview: ECE 331: Midterm II, May 5, 2008 ti NAME : ` - - ^ i 2 l l G c ' Z ' l 7 PLEDGE : " No aid given , received or observed ." Signature FILL YOUR NAME AND PLEDGE YOURSELF TO FINISH THIS EXAM INDEPENDENTLY. ALL QUESTIONS MUST BE ANSWERED ON THE PAGES PROVIDED. WHEN NECESSARY USE THE BACK OF THE PAGE TO COMPLETE THE QUESTION. CLOSED BOOKS , TWO-PAGES OF HAND- WRITTEN NOTES. IT IS SUGGESTED THAT YOU ANSWER FIRST THE QUESTIONS YOU CONSIDER EASIEST. Free electron mass mo 9.11 x 1031 Kg Electron charge q 1.60 x 1019 C Permittivity of free space so 8.85 x 10-12 F/m Boltzman constant kB 1.38 x 10.23 J/K Planck ' s constant 6.63 x 10"34 Js Avogadro ' s number NA 6.02 x 1023 /mole Speed of light 1. (15 points) 3.00 x 101, m/s (a) Explain the concept of Fermi energy level in a semiconductor. (3 points ec h b ^ / / \ ` ^ e ^ h fZ ^ ^ L ^ v v .^ ^ v C ^ C C 5 ^ p , e r e c z - vce 1 r v G ` I r 1 1 n r n C yr sZ C ti/'c1 Z c L j \F ck' 1 1 S . r ^ r ^ j V Z ^I ^k (b) Draw simplified band structures of semiconductors, insulators, and metals at 0 K. (6 points)(b) Draw simplified band structures of semiconductors, insulators, and metals at 0 K....
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ECE331_midterm2_solns - ECE 331: Midterm II, May 5, 2008 ti...

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