半導體物理 (二) 半導體之物理現象介紹.

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Presentation transcript:

半導體物理 (二) 半導體之物理現象介紹

半導體之物理現象介紹 Density of states function Fermi-Dirac distribution Carrier concentrations Work function Excess carriers in semiconductors Diffusion of carriers Diffusion and drift of carriers

Density of states function & Fermi-Dirac distribution

Carrier concentrations

Work Function

Excess of carriers in semiconductors If a carrier excess is created by optical excitation or carrier injection via a suitable contact. When the excitation is then suddenly cut off, the carrier concentrations will return gradually to their thermal equilibrium values owing to recombination of the excess carriers. Physically, t represents the average time an excess carrier remains free before recombining directly. The carrier lifetime for indirect recombination is more complicated than in the above case.

Diffusion of carriers

Diffusion and drift of carriers