Lecture 3 - MIT
6.012 Spring 2007 Lecture 3 12 Fick’s first law-Key diffusion relationship Flux ≡number of particles crossing a unit area per unit time [cm-2 • s-1] For Electrons: Fn =−Dn dn dx D measures the ease of carrier diffusion in response to a concentration gradient: D ↑⇒Fdiff ↑ D limited by vibration of lattice atoms and ionized dopants.
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