P-n Junction Diode.

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Presentation transcript:

p-n Junction Diode

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

Structure and principle of operation

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

Thermal equilibrium

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

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

The full-depletion approximation

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

The linearly graded p-n junction

The ideal diode current The p-n diode current The ideal diode current

p-n Junction Diode Exemplos e Exercícios