# Physics of Semiconductor Devices Lecture 2. Carrier

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Physics of Semiconductor Devices Lecture 2. Carrier statistics in semiconductors A. V. Sogoyan

Contents: • Introduction to carrier statistics in solids. Fermi-Dirac distribution. Fermi level. • Intrinsic and extrinsic semiconductors. Donors and acceptors. • The dependence of Fermi level on the temperature and doping concentration.

Introduction to carrier statistics in solids At finite temperature, state occupation probability by electron is determined by Fermi-Dirac distribution function f(E): E F – Fermi level

Introduction to carrier statistics in solids

Introduction to carrier statistics in solids

Introduction to carrier statistics in solids

Introduction to carrier statistics in solids Conduction and valence band density of states

Introduction to carrier statistics in solids

Introduction to carrier statistics in solids

Introduction to carrier statistics in solids

Introduction to carrier statistics in solids

Introduction to carrier statistics in solids

Introduction to carrier statistics in solids

Introduction to carrier statistics in solids

Introduction to carrier statistics in solids

Introduction to carrier statistics in solids

Introduction to carrier statistics in solids Similarly,

Introduction to carrier statistics in solids

Introduction to carrier statistics in solids

Introduction to carrier statistics in solids

Introduction to carrier statistics in solids

Introduction to carrier statistics in solids

Introduction to carrier statistics in solids Free electron density as a function of temperature

Conclusions

Conclusions