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Electron concentration in semiconductor

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boks

Joined Oct 10, 2008
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The room-temperature electrical conduuctivity of a silicon specimen isn 500(Omega-m)^-1. The hole concentration is known to be 2.0E22 m^-3. Ele electron and hole mobilities are 0.14 and 0.05 m^2/V-s, respectively. What is the electron concentration?

(Answer: 2.97E20/m^3)

Which equation should I use?
 
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