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What is GaAs?
 
GaAs(Gallium arsenide) is a compound semiconductor material,a mixture of two elements, gallium (Ga) and arsenic (As). The uses of Gallium arsenide are varied and include being used in LED/LD, field-effect transistors (FETs), and integrated circuits (ICs).
 
GaAs Basic Parameters at 300K
 
 
Crystal structure Zinc Blende
Group of symmetry Td2-F43m
Number of atoms in 1 cm3 4.42·1022
de Broglie electron wavelength 240 A
Debye temperature 360 K
Density 5.32 g cm-3
Dielectric constant (static ) 12.9
Dielectric constant (high frequency) 10.89
Effective electron mass me 0.063mo
Effective hole masses mh 0.51mo
Effective hole masses mlp 0.082mo
Electron affinity 4.07 eV
Lattice constant 5.65325 A
Optical phonon energy 0.035 eV
 
 
GaAs Electrical Parameters
 
Breakdown field ≈4·105 V/cm
Mobility electrons ≤8500 cm2 V-1s-1
Mobility holes ≤400 cm2 V-1s-1
Diffusion coefficient electrons ≤200 cm2/s
Diffusion coefficient holes ≤10 cm2/s
Electron thermal velocity 4.4·105 m/s
Hole thermal velocity 1.8·105m/s
 
 
 
 
And now we introduce types of uses of GaAs based devices:
 
 
Types and Uses of GaAs Electronic Devices        
       
Electronic devices Material(layer/substrate) Application  Technology Tends Material Required  
Digital IC GaAs/GaAs  Ultra-high-speed computers High level of integration    
(MESFETHEMT) GaAlAs/GaAs PC,ATM,Image Processing  Low operating voltage    
Microvave Devices GaAs/GaAs Mobile communications, satellite broadcasting High power, low noise, Low cost  
(MESFETHEMT, GaAlAs/GaAs Low-noise receiver, amplified High level of integration Large diameter  
Simulation  GaAlAs/InGaAs/GaAs Automotive anti-collision system  Low operating voltage Low Vth   
ICMMICHBT) InGaP/GaAs/GaAs PAR      
Hall devices GaAs/GaAs Auto VTR High sensitivity Low cost,large diameter  
FDD sensors  
Position detection sensor  
           
Types and Uses of GaAs Optoelectronic Devices      
           
Optoelectronic devices Material(layer/substrate) Application Technology Tends Material Required  
Visible Light LED GaAsP/GaAs( red )                        GaAlAs/GaAs(high brightness red)   InGaAlP/GaAs(high brightness orange/yellow) Home appliances, DA, electronic equipment  High brightness Low costs  
Car lights Short wavelength Large diameter   
Lights in fax      
IR LED GaAs/GaAs                                        GaAlAs/GaAs Home appliances,DA      
machinery in Electronics industry  High power     
Remote control and optocoupler      
Optical circuit breaker      
Semiconductor Laser GaAs/GaAs Optical communication switch      
Short Wavelength LD GaAlAs/GaAs(780nm)          InGaAlP/GaAs(680630nm)  Light-emitting devices for Optical LAN,light emitting devices for testing equipments,CD,MD,Laser printer,CD-Rom,DVD-Rom,DVD-RAM High Power,high level of integration,low wavelength Low density,large diameter,low cost  
 
Solar Cell GaAs/GaAs Satellite broadcasting, communications,Unmanned meteorological stations