Semiconductor physics

Which is the correct unit of carrier mobility?

  1. Acm²/(V·s)
  2. BΩ·cm
  3. Ccm/s
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Answer: A. cm²/(V·s)

Mobility is the drift velocity (cm/s) per unit electric field (V/cm), so its unit is (cm/s) ÷ (V/cm) = cm²/(V·s). cm/s is a unit of velocity, and Ω·cm is the unit of resistivity.

  • A. Correct. Velocity divided by electric field gives cm²/(V·s).
  • B. Ω·cm is the unit of resistivity.
  • C. cm/s is a unit of velocity, such as drift velocity.
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  1. With electron density n, hole density p, electron mobility μn, hole mobility μp and elementary charge q, which expression gives the conductivity σ of a semiconductor?
  2. What is the process called in which electrons and holes recombine through deep levels (traps) in the band gap?
  3. With minority carrier diffusion coefficient D and lifetime τ, which expression gives the diffusion length L?
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