同济大学：《大学物理》课程教学资源（电子教案，英文版）第二十三章 固体物理

The Theory of Solid

The Theory of Solid

Agenda today 1.The behavior of electron in solid and molecules 2.Band theory 3.Conductor,Insulator,Semiconductor 4.Diodes and transistors

Agenda today 1. The behavior of electron in solid and molecules 2. Band theory 3. Conductor, Insulator, Semiconductor 4. Diodes and transistors

Chemical bond 1.Ionic bond 2.Covalent band Molecular orbit (b) Bonding orbit and anti-bonding orbit

Chemical bond 1. Ionic bond 2. Covalent band Molecular orbit Bonding orbit and anti-bonding orbit

hybridization @ Metallic bond Hydrogen bond Van der Waals bond

hybridization Metallic bond Hydrogen bond Van der Waals bond

Crystal lattice 月月强 好四 月贸问园 Drthorhombic systems Rhombohedral systems 中中 Monoclinic Triclinic

Crystal lattice

Electron wave in periodic potential Bloch wave Y(r)=u(r)exp(i迟·r） Kronig-Penney model V(x)A X -b0 aa+b

Electron wave in periodic potential Kronig-Penney model Bloch wave (r) u (r)exp(iK r) k k   

29 s 离子间距 能带重叠示意图

Band (能带)theory: 能带 Energy levels split 能级 △E up when atoms interact with each other. The higher the energy level is,the wider is the energy band. The smaller the distance between atoms is,the wider the energy band

Band （能带）theory: Energy levels split up when atoms interact with each other. The higher the energy level is, the wider is the energy band. The smaller the distance between atoms is, the wider the energy band

Conduction band,forbidden band,valence band 导带，禁带，价带 Bands unfilled or half-filled are called conduction band The energy gaps between bands are called forbidden band The highest filled bands are called valence band

Conduction band, forbidden band, valence band Bands unfilled or half-filled are called conduction band. The energy gaps between bands are called forbidden band The highest filled bands are called valence band. 导带，禁带，价带

conductor semiconductor insulator AEg

conductor semiconductor insulator Eg Eg Eg