# Review+1 - EECS 320 Midterm Review Outline Intro to...

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Unformatted text preview: EECS 320 Midterm Review Outline Intro to Semiconductor Physics PN Junction Crystal Structure Band Digram Band Diagram: DOS, m * , Fermi statistics, Carrier statistics Diode Electrostatics: Qualitative & Quantitative Continuity Equation: Drift and diffusion, R-G, MCDE Crystal Structure Lattice Unit cell Periodic arrangement of atoms in a crystal Small volume of crystal that may be used to reproduce the entire crystal Simple cubic lattice constant a Primitive unit cell Smallest unit cell that describes the crystal Body centered cubic (BCC) Lattice constant is a material parameter Determining Miller Indices 1. Find intercepts (as multiple of lattice constant) 2. Take reciprocal 3. Multiply by lowest common denominator a a a 2/3 a x y z Conductors, Semiconductors, and Insulators Many of the electronic properties of a material will be determined by the bandgap energy Effective Mass Energy-Momentum Relations In A Semiconductor • Complex relationship described by quantum mechanics, commonly referred to as the “ band structure ” • Near E C , approximately parabolic • Replace m with m n * - effective mass Free electron Semiconductor E E p E C p * 2 2 n m p E ≈ k p h = Density Of States 3 2 2 / 1 2 / 3 * ) ( 2 ) ( h π C n c E E m E g − = 3 2 2 / 1 2 / 3 * ) ( 2 ) ( h π E E m E g V p v − = E g(E) E V E C Valence band Conduction...
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Review+1 - EECS 320 Midterm Review Outline Intro to...

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