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Unformatted text preview: +-p diode dominated by electron diffusion in p-type region. Electron diffusion length L n in p-type is ~ 100 μ m << contact distance W = 0.1 cm, i.e., a wide-base diode and J n = [ μ n kTn i 2 / N a L n ]exp( qV app / kT ) n ~ 1000 cm 2 /V-s, so J n ~ 1.35 A/cm 2 . (c) Resistivity of p-type, N a = 10 17 cm-3 : ρ ~ 0.2 Ω-cm. Field E = J n = 0.27 V/cm IR drop in p-region = W× E = 27 mV....
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This note was uploaded on 10/09/2010 for the course ECE 230 at UCSD.