03 - Effective mass, doping, DOS

03 - Effective mass, doping, DOS - Energy bands, effective...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Energy bands, effective mass, doping, density of states What are intrinsic and doped semiconductors? What type of impurities can be dopants for Si? What are the energy levels of the dopant atoms? What is “n” the number of electrons (or “p”, number of holes) able to provide current flow? What is the number of available electron (hole) states in a semiconductor? How are charge carriers distributed in energy?
Background image of page 1

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

View Full DocumentRight Arrow Icon
Covalent Bonding in a Crystal
Background image of page 2
Conduction and Valence Bands Valence electrons define conductivity Semiconductor Valence band filled with electrons Core electrons valence electrons Conduction band E vac Energy Bandgap Metal Valence partially filled with electrons valence electrons Conduction band E vac
Background image of page 3

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

View Full DocumentRight Arrow Icon
Energy band formation due to interaction of valence electrons between neighboring atoms When a discrete energy level broadens into an energy band, the valence electrons are not associated with single atoms anymore
Background image of page 4
Energy Band Diagram Core electrons valence electrons Conduction band E vac Energy Bandgap Primarily concerned with edge of conduction and valence bands E C E V “If you can’t draw the energy band diagram, you don’t know what you are talking about” - Herbert Kroemer 2000 Nobel Physics Laureate valence “band edge” conduction “band edge” (mostly empty) (mostly filled)
Background image of page 5

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

View Full DocumentRight Arrow Icon
Free Electron and Electrons In A Crystal 0 Force dv qm dt  E Free electrons in a vacuum respond to applied electric fields by the following m 0
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 07/22/2011 for the course EECS 320 taught by Professor Sun during the Fall '10 term at University of Florida.

Page1 / 21

03 - Effective mass, doping, DOS - Energy bands, effective...

This preview shows document pages 1 - 7. Sign up to view the full document.

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