Lecture 6 - chap 3 - Chapter 3 Energy Bands and Charge...

Info iconThis preview shows pages 1–15. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 3 Energy Bands and Charge Carriers Sumit Chaudhary sumitc@iastate.edu
Background image of page 1

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

View Full DocumentRight Arrow Icon
Reading and HW HW 3 – Some problems were assigned on Tue. More will be assigned today– All of them due next Tue Quiz – next Tuesday – on chapter 2 material covered in the lecture.
Background image of page 2
Bonding in solids 3
Background image of page 3

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

View Full DocumentRight Arrow Icon
Ionic 4
Background image of page 4
Metallic 5
Background image of page 5

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

View Full DocumentRight Arrow Icon
Covalent 6
Background image of page 6
Mixed states 7
Background image of page 7

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

View Full DocumentRight Arrow Icon
Splitting of energy levels for multiple atoms close to each other (in a crystal)
Background image of page 8
Bond formation Coulombic potential energy is lowered between two nuclei, because electron is now attracted by two nuclei
Background image of page 9

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

View Full DocumentRight Arrow Icon
Splitting for a single state Atoms coming closer and closer
Background image of page 10
Energy Bands for Silicon
Background image of page 11

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

View Full DocumentRight Arrow Icon
Energy bands for silicon (textbook pic)
Background image of page 12
Energy bands for metals, semiconductors and insulators If we could vary the spacing between silicon atoms, we can make it a metal (check previous 2 slides)
Background image of page 13

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

View Full DocumentRight Arrow Icon
Electron (plane wave) travelling through a periodic lattice has wave vector k k is analogous to momentum k is also called propagation constant
Background image of page 14
Image of page 15
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/22/2012 for the course ELECTRICAL 332 taught by Professor Sumitchaudhary during the Spring '12 term at Iowa State.

Page1 / 22

Lecture 6 - chap 3 - Chapter 3 Energy Bands and Charge...

This preview shows document pages 1 - 15. Sign up to view the full document.

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