p-n junction diode. basic device technology structure and principle of operation electrostatic...
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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 p-n diode current
The ideal diode current
p-n Junction Diode
Exemplos e Exercícios