Lecture4-DensityOfStatesFermiEnergi

# Lecture4-DensityOfStatesFermiEnergi - Lecture 4 Density of...

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ECE 3040 - Dr. Alan Doolittle Georgia Tech Lecture 4 Density of States and Fermi Energy Concepts Reading: (Cont’d) Pierret 2.1-2.6

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ECE 3040 - Dr. Alan Doolittle Georgia Tech How do electrons and holes populate the bands? Density of States Concept Quantum Mechanics tells us that the number of available states in a cubic cm per unit of energy, the density of states, is given by: eV cm States of Number unit E E E E m m E g E E E E m m E g v v p p v c c n n c = = 3 3 2 * * 3 2 * * , ) ( 2 ) ( , ) ( 2 ) ( h h π
ECE 3040 - Dr. Alan Doolittle Georgia Tech How do electrons and holes populate the bands? Density of States Concept Thus, the number of states per cubic centimeter between energy E’ and E’+dE is otherwise and and 0 , E E’ if )dE (E’ g , E E’ if )dE (E’ g v v c c

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ECE 3040 - Dr. Alan Doolittle Georgia Tech How do electrons and holes populate the bands? Probability of Occupation (Fermi Function) Concept
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Lecture4-DensityOfStatesFermiEnergi - Lecture 4 Density of...

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