7.NP_junction - 1 DDE 2 Displaced Maxwellian Displaced...

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1 DDE DDE
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2 Displaced Displaced Maxwellian Maxwellian n=6.25E16 /cm 3 v d =2v R /10 •Mark±v d on the graph Drift current density: Equilibrium: n 0 =6.25E16 /cm 3 What is the current density in this example?
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3 Mobility Mobility Measured drift velocities • At low fields, the relationship is linear: • Low-field mobility is µ 0 •Why±does ±v d saturate at high fields? Does mobility depend on doping density?
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4 Diffusion current Diffusion current g(E) f(E) The driving force in this case is not a PE gradient but is the concentration part of the KE gradient. 2 What is lbar ? • There's a net flow of electrons from L R Even at equilibrium ?? Diffusion current density Do Taylor
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5 The The np np - - junction junction Sections 6.1, 6.2, 6.3 of course text: 1. Electrochemical potential 2. Equilibrium energy band diagram 3. Carrier concentrations and potential 4. Depletion Approximation 5. np-junction under bias
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6 np np - - junction: formation junction: formation • Consider separate
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This note was uploaded on 11/10/2010 for the course EECE 480 taught by Professor David during the Fall '09 term at The University of British Columbia.

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7.NP_junction - 1 DDE 2 Displaced Maxwellian Displaced...

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