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Chapter 11 Density of States, Fermi Energy and Energy Bands

11-1 Chapter 11 Density of states , Fermi Energy and Energy Bands Contents Chapter 11 Density of states , Fermi Energy and Energy Bands .. 11-1 Contents .. 11-1 Current and Energy Transport .. 11-1 Electron Density of states .. 11-2 Dispersion Relation .. 11-2 Effective Mass .. 11-3 Density of states .. 11-5 Fermi -Dirac Distribution .. 11-7 Electron Concentration .. 11-8 Fermi Energy in Metals .. 11-9 EXAMPLE Fermi Energy in Gold .. 11-11 Fermi Energy in Semiconductors .. 11-12 EXAMPLE Fermi Energy in Doped Semiconductors .. 11-13 Energy Bands .. 11-14 Multiple Bands .. 11-15 Direct and Indirect 11-16 Periodic Potential (Kronig-Penney Model) .. 11-17 Problems .. 11-24 References .. 11-24 Current and Energy Transport The electric field E is interfered with two processes which are the electric current Density j and the temperature gradientT.

In this chapter, only the electronic contribution to the total thermal conductivity is used. q e Tj k e T (11.4) We consider a one-dimensional analysis in this chapter because most thermoelectric devices reasonably holds one-dimension, so that tensor notations are avoided. 11.2 Electron Density of States …

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