PHYSICS 3K03 Lecture Notes - Lecture 12: Water Horse, Pipe Networks, Wetted Perimeter
22 Jun 2018
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Depletion region
Depletion region Built-in voltage at depletion region
- Prevents further diffusion across depletion region
Charge in either side in the depletion region
Width of depletion region:
dielectric constant of Si
- Typically, to
- One side of the junction is usually much more heavily doped
pn junction with a bias voltage
- Forward bias is when p region is forced to be at a higher voltage
Capacitance of pn
junction
Charge stored in one side of depletion region
Capacitance:
- A diode is a voltage-controlled capacitor (varactor) and are operated with reverse bia
(above equation only applies to reverse bias)
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Alternatively,
Carrier concentrations in
depletion region
In the pn junction (depletion region),
equilibrium concentration in p region
equilibrium concentration in n region
equilibrium concentration in n region
equilibrium concentration in p region
Law of the Junction
Hole and electron concentration profile:
= diffusion length; = minority carrier life time
= diffusion length for donors
Diffusion current densities:
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Document Summary
Charge in either side in the depletion region. Width of depletion region: dielectric constant of si. One side of the junction is usually much more heavily doped pn junction with a bias voltage. Forward bias is when p region is forced to be at a higher voltage. Charge stored in one side of depletion region junction. A diode is a voltage-controlled capacitor (varactor) and are operated with reverse bia (above equation only applies to reverse bias) In the pn junction (depletion region), depletion region equilibrium concentration in p region equilibrium concentration in n region equilibrium concentration in n region equilibrium concentration in p region. = diffusion length; = minority carrier life time. # of dimensionless variables = # of parameters - # of primary dimensions. Make sure repeated variables are not dimensionless and has all the primary dimensions. Friction factor in turbulent flow: look on moody chart roughness, pipe diameter. Minor losses: loss coefficient; look up in table.
