Chapter 18.2

Chapter 18.2 - Energy Band Structures and Conductivity The...

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6 MSE 2090: Introduction to Materials Science Chapter 18, Electrical Conductivity Energy Band Structures and Conductivity The highest filled state at 0 K Fermi Energy (E F ) The two highest energy bands are: ¾ Valence band – the highest band where the electrons are present at 0 K ¾ Conduction band - a partially filled or empty energy band where the electrons can increase their energies by going to higher energy levels within the band when an electric field is applied Energy conduction band valence band unfilled bands filled bands band gap
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7 MSE 2090: Introduction to Materials Science Chapter 18, Electrical Conductivity Energy Band Structures and Conductivity (metals) In metals (conductors) , highest occupied band is partially filled or bands overlap. Conduction occurs by promoting electrons into conducting states, that starts right above the Fermi level. The conducting states are separated from the valence band by an infinitesimal amount. Energy provided by an electric field is sufficient to excite
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Chapter 18.2 - Energy Band Structures and Conductivity The...

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