lecture5 - Lecture 5+ Wednesday, February 2 EE 332...

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Lecture 5+ Wednesday, February 2 EE 332 Semiconductor Devices Problem Assignment 2.17a, 2.22, 2.28 Review questions 1-6 for in class review Include last 11 slides posted for previous lecture Example Prob. 2.7 For the band diagram a) What is the potential energy of the electron? b) What is the kinetic energy of the electron? c) What is the potential energy of the hole? d) What is the kinetic energy of the hole? e) Increasing electron energy is up. What direction represents increasing hole energy? Fermi-Dirac Statistics Probability of State Occupation () () kT E E F e E f / 1 1 + = The probability that a state with energy E is occupied by an electron is given by the Fermi- Dirac distribution function Understanding solids is about Number of States, and Probability of State Occupation Fermi Energy, E F The fermi energy in the fermi-dirac distribution is defined as either the highest energy state occupied at T=0K, or the energy where the probability of the state being occupied is 2 1 For intrinsic materials, the fermi energy is determined by the number of electrons per cm 3 . Adding more electrons to the semiconductor with donor electrons moves the fermi energy up.
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Fermi Distribution Function Applied to Semiconductors Holes and the Fermi Distribution Function The fermi function gives the probability of an
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This note was uploaded on 06/30/2010 for the course EECE 332 taught by Professor Constable during the Spring '08 term at Binghamton.

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lecture5 - Lecture 5+ Wednesday, February 2 EE 332...

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