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Published byTimothy Napier Modified over 2 years ago

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p-n Junction Diode

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Basic device technology Structure and principle of operation Electrostatic analysis of a p-n diode –Depletion region and depletion capacitance –Abrupt junction –Linearly graded junction Current - voltage characteristics –Shockley equation –Generation-Recombination Process –High injection –Diffusion capacitance Reverse bias breakdown –Thermal instability –Tunneling effect –Avalanche multiplication Transient behavior

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Structure and principle of operation

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Energy band diagram of a p-n junction (a) before and (b) after merging the n-type and p-type regions

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Thermal equilibrium

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Energy band diagram of a p-n junction under reverse and forward bias

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General discussion - Poisson's equation Não é trivial de resolver!

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The full-depletion approximation

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1. Região de carga espacial 2. Nível de Fermi em equilíbrio 3. Built-in voltage 4. Built-in voltage e densidade de dopantes 5. Largura da região de carga espacial 6. Capacitância de depleção

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The linearly graded p-n junction

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The p-n diode current The ideal diode current

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p-n Junction Diode Exemplos e Exercícios

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