MATS 3011 Lecture Notes - Fermi Energy, Electronvolt, Chemotherapy-Induced Nausea And Vomiting

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15 Jul 2014
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Example: calculate the intrinsic conductivity of si @ 300 k. This is for semiconductors since they contain holes. For intrinsic semiconductors, electron and hole mobilities are set numbers. For si, e = 0. 14 m2/(vs) = 1400 cm2/(vs) You get this when fermi energy cancels out. You get this when fermi energy cancels out this ni. 2 = a number when you choose a material and a t. Nv is the same but me* replaced by mh* For this problem, me* = 1. 08 me and mh* = 0. 81 me; ni = 1010 cm-3 = 1016 m-3. Units of nc = m-3makes sense since it = # of states per cubic meter. Example 2: calculate of si @ 300 k when it is doped w/ p @ following concentrations (a) 5*1010 cm-3 (b) 5*1014 cm-3 (c) 5*1017 cm-3. Assume electron mobilities don"t change by changing concentraitonremain in plateau regions. P has 5 electrons and really easy to give one away.

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