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semiconductor_diode

semiconductor_diode - Semiconductor pn Junction Diode...

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Sam Palermo Analog & Mixed-Signal Center Texas A&M University ECEN325: Electronics Fall 2011 Semiconductor pn Junction Diode
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Semiconductors 2 A semiconductor is a material whose conductivity lies somewhere between an insulator and a conductor Example: Pure or “intrinsic” Silicon (Si) has 4 valence electrons and is not a very good conductor A semiconductor’s conductive properties can be changed by “doping” the material with either n- type dopants (Phosphorous) or p-type dopants (Boron) A diode is formed at the boundary or junction of a p and n type semiconductor
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Unformatted text preview: Semiconductor pn Junction Diode Physical Schematic 3 Intrinsic Si p-type Si n-type Si doping doping [Sedra/Smith] Diffusion, Drift Current, & Barrier Voltage 4 • “Majority-Carrier” Diffusion Current, I D • Caused by majority carriers diffusing into other region • “Minority-Carrier” Drift Current, I S • Caused by thermally generated minority carriers sweeping across the junction due to the E-field [Sedra/Smith] Operation w/ Different Biases 5 • Open Circuit, I D =I S • Reverse-Biased, I S >I D • Forward-Biased, I D >I S [Sedra/Smith]...
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