PPT Slide

CHEN435/PHGN435: Interdisciplinary Silicon Processing Laboratory

Donors and Acceptors

Valence Band

Conduction Band

Ev

ED

Ec

Substitutional Impurities

Donors
• Group V Elements (P, As)
• Donate Electron
• Located ~0.05 V below
  conduction band
  

Acceptors
• Group III Elements (B)
• Accept an Electron
• ~0.05 V above valence band

Moves Fermi Level

EA

Thermal Energy

kT = 0.0259 V

@ 300 K

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