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note2slides - Handout 2 Overview of Semiconductors What you...

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Handout 2 ECE 315, Cornell University 1 Overview of Semiconductors What you will learn: Intrinsic (pure) and extrinsic (doped) semiconductors. Carrier statistics in equilibrium and under bias. Basic differential equations to model the semiconductor devices. Handout 2
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Handout 2 ECE 315, Cornell University 2 2.1. Statistics of Electrons and holes in homogeneous semiconductors Electrons and holes in intrinsic semiconductors N-type and P-type doping semiconductors Electrons and holes in equilibrium and quasi-neutral relations. Carrier statistics in N-type and P-type semiconductors. Sedra and Smith: Sec. 3.7
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Handout 2 ECE 315, Cornell University 3 Semiconductor is the class of material where the conductivity of the material can be controlled to vary a large orders of magnitude, i.e., > 10 10 , (metal: conductivity always high; insulator: conductivity always low). Elemental semiconductor: Si, Ge Compound semiconductor (fixed composition): SiC, GaAs, GaN Alloy: Si 1-x Ge x , Al 1-x Ga x As, Hg 1-x Cd x Te, etc. Purity: semiconductor devices are made of semiconductors with ultra purity: unintentional doping < 10 -9 in part, i.e., 0.001 ppm in solids To increase range of control in conductivity (lower leakage when devices are switched off, faster switching when devices are on) To increase mobility (faster and less power consumption from lower resistivity) Introduction to Semiconductors
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