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