Chapter 18.3

Chapter 18.3 - Energy Band Structures and Conductivity...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
11 MSE 2090: Introduction to Materials Science Chapter 18, Electrical Conductivity Energy Band Structures and Conductivity (metals, semiconductors, insulators) Semiconductors and Insulators Metals
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
MSE 2090: Introduction to Materials Science Chapter 18, Electrical Conductivity Electron Mobility ¾ The force acting on the electron is -eE, where e is the electric charge. ¾ This force produces a constant acceleration so that, in the absence of obstacles the electron speeds up continuously in an electric field. This is the case in vacuum (e.g. inside a TV tube) or in a perfect crystal (this is a conclusion from quantum mechanics). ¾ In a real solid, the electrons scatter by collisions with imperfections and due to atomic thermal vibrations . “frictional forces” resistance a net drift velocity of electron motion is established: | v d |= μ e E where μ e electron mobility [m 2 /V-s] . The “friction” transfers part of the energy supplied by the electric field into the
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/14/2012 for the course MSE 2090 taught by Professor Leoindzhiglei during the Fall '10 term at UVA.

Page1 / 5

Chapter 18.3 - Energy Band Structures and Conductivity...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online