EE 105 Semiconductors - EECS At UC Berkeley
EE 105SemiconductorsBernhard E. BoserUniversity of California, Berkeleyboser@eecs.berkeley.eduCopyright 2012 by Bernhard BoserB. E. BoserEE 105 Lecture 2: Semiconductors1
Active Devices Control (current) flow Cascadeable:– Compatible inputs and outputs including– Same physical domain, e.g. ElectricalPneumaticChemicalMechanical– Compatible signal levels, e.g. Switch with 5V control signal must be able to switch 5V at output Examples:– Transistor– Relays– Vacuum tubeB. E. BoserEE 105 Lecture 2: Semiconductors2
SemiconductorsB. E. BoserEE 105 Lecture 2: Semiconductors3
Electrical ConductionB. E. BoserEE 105 Lecture 2: Semiconductors4
Atom ShellsSiB. E. BoserEE 105 Lecture 2: Semiconductors5
SemiconductorsIIIB. E. BoserEE 105 Lecture 2: SemiconductorsIVV6
Silicon CrystalB. E. BoserEE 105 Lecture 2: Semiconductors7
Silicon CrystalDensity:5 x 1022 atoms / cm3Distance between atoms:0.235 nmB. E. BoserEE 105 Lecture 2: Semiconductors8
2D Representation for SimplicityB. E. BoserEE 105 Lecture 2: Semiconductors9
BandgapB. E. BoserEE 105 Lecture 2: Semiconductors10
Intrinsic Carrier Concentration ni1 101212101 10111 1010n i T x T 0 31 109cm1 1081 107610 1 106 55B. E. Boser4020020TxEE 105 Lecture 2: Semiconductors4060808511
Semiconductors SummaryB. E. BoserEE 105 Lecture 2: Semiconductors12
Drift CurrentB. E. BoserEE 105 Lecture 2: Semiconductors13
Current FlowB. E. BoserEE 105 Lecture 2: Semiconductors14
MobilityJacoboni, C., C. Canali, G. Ottaviani, and A. A. Quaranta,Solid State Electron. 20, 2(1977) 77-89.Electron drift velocity in SiB. E. BoserEE 105 Lecture 2: Semiconductors15
Drift Current ExampleB. E. BoserEE 105 Lecture 2: Semiconductors16
HolesB. E. BoserEE 105 Lecture 2: Semiconductors17
“Semi” Conductor?B. E. BoserEE 105 Lecture 2: Semiconductors18
DonorsB. E. BoserEE 105 Lecture 2: Semiconductors19
QuestionIs a doped semiconductor charge neutral?B. E. BoserEE 105 Lecture 2: Semiconductors20
Uniform Semiconductors SummaryB. E. BoserEE 105 Lecture 2: Semiconductors21
pn Junction(Diode)B. E. BoserEE 105 Lecture 2: Semiconductors22
pn Junctionp NAB. E. Bosern NDEE 105 Lecture 2: Semiconductors23
Depletion RegionB. E. BoserEE 105 Lecture 2: Semiconductors24
Drift and Diffusion Currentsp NAn NDIdiffusion,n Idrift,n 0AB. E. BoserEE 105 Lecture 2: Semiconductors25
Junction Potentialhttp://en.wikipedia.org/wiki/P-n junctionB. E. BoserEE 105 Lecture 2: Semiconductors26
Reverse BiasRef: R. Howe, Prentice Hall.B. E. BoserEE 105 Lecture 2: Semiconductors27
Forward BiasB. E. BoserEE 105 Lecture 2: Semiconductors28
Putting it all TogetherB. E. BoserEE 105 Lecture 2: Semiconductors29
EE 105 Lecture 2: Semiconductors . B. E. Boser 3 Semiconductors EE 105 Lecture 2: Semiconductors . B. E. Boser 4 Electrical Conduction . EE 105 Introduction to Microelectronics Author: Bernhard Boser Subject: EE247 Lect
1 Introduction Semiconductors can be divided into two categories. 1.Intrinsic semiconductors 2.Extrinsic semiconductors This classi cation is related to the purity of the semiconductors. Intrinsic or pure semiconductors are those that are ideal, with no defects, and no ex-ternal impuriti
SEMICONDUCTOR ELECTRONICS 1. Classification of metals, conductors and semiconductors Metals Semiconductors Insulators 10-2 to 10 -8 11 m 10-5 to 106 m 10 - 1019 m 102 t0 108 S m-1 105 to 10-6-1S m-1 10-11 to 10-19 S m Semiconductors a. Elemental semiconductors like Si, Ge b. Compound semiconductors i. Inorganic - Cds, Ga As, Cdse, InP etc, ii. Organic - antheracene, doped pthalocyanines iii .
Lecture 2 Basic Semiconductor Physics In this lecture you will learn: What are semiconductors? Basic crystal structure of semiconductors Electrons and holes in semiconductors Intrinsic semiconductors Extrinsic semiconductors n-doped and p-doped semiconduct
W V I CV V V L µ, ()() 2 GS T DS sat ox GS T GS T W VV I CV V V V L µ 2, 2 ox DS sat GS T W C I VV L µ 2, ()(1 ) 2 ox DSsat GS T DS W C I VV V L µ λ Department of EECS University of California, Berkeley EECS 105 Spring 2004, Lecture 42 Prof. J. S. Smith A Simple Circuit:
Lecture 2: Semiconductors: Introduction Contents 1 Introduction 1 2 Band formation in semiconductors 2 3 Classi cation of semiconductors 5 4 Electron e ective mass 10 1 Introduction Metals have electrical conductivity. This is related to the fact that the energy band of the me
Semiconductors EE 105 Lecture 1: Microelectronic Devices and Circuits. B. E. Boser 32 Conductors, Insulators, Semiconductors . EE 105 Introduction to Microelectronics Author: Bernhard Boser Subject: EE247 Lect
ExamTitle: POLICE OFFICER OC Established Date: 12/24/2015 Accurate as of date established. Only passing grades are displayed. Position Number Name Score 1 CAMPOS GARCIA, VIOLETA N 105 1 CONLON, MARC R 105 1 DOERLER, DANIEL R 105 1 FLETCHER, WILBURN S 105 1 GABRIEL, MATTHEW J 105 1 GALIETTA, CHRISTOPHER A 105
See Mr Bridge’s website under Library. Weak two opening. Some players use an opening bid of 2H or 2S to mean 6 cards in the bid suit and six to ten points. See Mr Bridge’s website under Library. George Strang . Title: Microsoft Word - Basic bidding rules.doc Author: george Created Date : 2/18/2013 9:20:47 AM .
