2010-MT-Exam-Midterm-Solution

Electrons and holes drift in opposite directions

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Unformatted text preview: ady states. Electrons and holes drift in opposite directions because they have opposite charges. The two electrical currents formed by (i) electrons flowing in one direction and (ii) holes flowing in the opposite direction, are directed in the same direction. In an intrinsic semiconductor, it is n0 = p0. Under illumination, it is n = p. Thus n = n0 + n = p = p0 + p. (b) Incorrect. (c) Incorrect. (d) Correct. (e) Incorrect. (f) Correct. (g) Correct. 3. (a) The sample is p-type, because the distance in energy between the hole quasi-Fermi level and the valence band is smaller than the distance in energy between the electron quasi160 meV Fermi level and the conduction band, F V C F (where F V and C 360 meV). F (b) From derivations in parts (d) and (g) we can calculate the change in elec...
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This note was uploaded on 03/25/2013 for the course EE 101 taught by Professor Assorted during the Spring '13 term at Rensselaer Polytechnic Institute.

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