Chapter 18.7

Chapter 18.7 - Carrier mobility For dopant concentrations...

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31 MSE 2090: Introduction to Materials Science Chapter 18, Electrical Conductivity Carrier mobility For dopant concentrations below 10 24 m -3 , mobility of both electrons and holes decreases with increasing temperature due to the enhanced thermal scattering.
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32 MSE 2090: Introduction to Materials Science Chapter 18, Electrical Conductivity Temperature variation of conductivity Basic equation for conductivity: σ = n|e| μ e + p|e| μ h In intrinsic semiconductors, the temperature dependence of mobilities, μ e and μ h is weak as compared to the strong exponential dependence of carrier concentration
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33 MSE 2090: Introduction to Materials Science Chapter 18, Electrical Conductivity Conduction in Polymers and Ionic Materials Ionic Materials ¾ In ionic materials, the band gap is large and only very few electrons can be promoted to the valence band by thermal fluctuations. ¾ Cation and anion diffusion can be directed by the electric field and can contribute to the total conductivity: σ total
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This note was uploaded on 02/14/2012 for the course MSE 2090 taught by Professor Leoindzhiglei during the Fall '10 term at UVA.

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Chapter 18.7 - Carrier mobility For dopant concentrations...

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