PHYSICS 3K03 Lecture Notes - Lecture 3: Electron Mobility, Drift Velocity, Electric Field

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22 Jun 2018

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pn junction

Equilibrium

concentration of free

electrons

forbidden energy “band-gap”

absolute temperature

Boltzmann’s constant

At room temperature,

In pure (intrinsic) Si,

Conductivity σ in intrinsic

Current density and electric field:

Drift velocity and mobility :

free hole and free electron concentrations

= electron charge

hole mobility at 300K

electron mobility at 300K

For pure (intrinsic) Si,

Extrinsic Si

At thermal equilibrium, Law of Mass-Action holds:

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