What is Junction capacitance (depletion capacitance)?

Junction capacitance (depletion capacitance) in the explanations

• Silicon's relative permittivity is about 11.7, used to calculate depletion width (W = √(2εV/qN)) and junction capacitance.

  Which value is closest to the relative permittivity of sili…

• A wider depletion region lowers the junction capacitance (C = εA/W), the property used in varactor diodes, and spreading the field over a wider region also helps withstand voltage.

  What happens to the width of the depletion layer when the r…

• Increasing reverse bias widens the depletion region and lowers the junction capacitance.

  Which property does a variable-capacitance (varactor) diode…

Questions that mention Junction capacitance (depletion capacitance) (8)

1. Which value is closest to the relative permittivity of silicon?
2. What happens to the width of the depletion layer when the reverse bias applied to a PN junction is increased?
3. Which property does a variable-capacitance (varactor) diode use?
4. How is a photodiode generally used to detect light?
5. In a forward-biased PN junction, which capacitance arises from the storage of injected minority carriers?
6. How does the depletion width of a one-sided abrupt junction depend on the reverse bias voltage V (when V is much larger than the built-in potential)?
7. In a high-frequency C-V measurement of a MOS capacitor on a p-type substrate, what happens to the capacitance when a large positive gate voltage drives the surface into strong inversion?
8. Which correctly describes the SOI (silicon on insulator) structure?

Related terms

Built-in potential EOT (equivalent oxide thickness) Depletion layer Photodiode Dark current Forward bias Diffusion capacitance Inversion layer Latch-up FD-SOI (fully depleted SOI)