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GaAs(Gallium arsenide) is a compound semiconductor material Sebastian Lletget World Cup Jersey ,a mixture of two elements, gallium (Ga) and arsenic (As). The uses of Gallium arsenide are varied and include being used in LEDLD, field-effect transistors (FETs), and integrated circuits (ICs).
GaAs Basic Parameters at 300K
Crystal structure Zinc Blende
Group of symmetry Td^2-F43m
Number of atoms in 1 cm3 4.42•10^22
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•10^5 Vcm
Mobility electrons ≤8500 cm2 V-1s-1
Mobility holes ≤400 cm2 V-1s-1
Diffusion coefficient electrons ≤200 cm2s
Diffusion coefficient holes ≤10 cm2s
Electron thermal velocity 4.4•10^5 ms
Hole thermal velocity 1.8•10^5ms
And now we introduce types of uses of GaAs based devices:
Types and Uses of GaAs Electronic Devices
Electronic devices Material(layersubstrate) Application Technology Tends Material Required
Digital IC GaAsGaAs Ultra-high-speed computers High level of integration ?
(MESFETHEMT) GaAlAsGaAs PC,ATM,Image Processing Low operating voltage ?
Microvave Devices GaAsGaAs Mobile communications, satellite broadcasting High power, low noise, Low cost
(MESFETHEMT, GaAlAsGaAs Low-noise receiver Sacha Kljestan World Cup Jersey , amplified High level of integration Large diameter
Simulation GaAlAsInGaAsGaAs Automotive anti-collision system Low operating voltage Low Vth
ICMMICHBT) InGaPGaAsGaAs PAR ? ?
Hall devices GaAsGaAs Auto VTR? High sensitivity Low cost,large diameter
Position detection sensor
Types and Uses of GaAs Optoelectronic Devices
Optoelectronic devices Material(layersubstrate) Application Technology Tends Material Required
Visible Light LED GaAsPGaAs( red ) GaAlAsGaAs(high brightness red) InGaAlPGaAs(high brightness orangeyellow) Home appliances, DA, electronic equipment High brightness Low costs
Car lights Short wavelength Large diameter
Lights in fax ? ?
IR LED GaAsGaAs GaAlAsGaAs Home appliances,DA ?
machinery in Electronics industry High power ?
Remote control and optocoupler ? ?
Optical circuit breaker ? ?
Semiconductor Laser GaAsGaAs Optical communication switch ? ?
Short Wavelength LD GaAlAsGaAs(780nm) InGaAlPGaAs(680?630nm) Light-emitting devices for Optical LAN,light emitting devices for testing equipments,CD,MD,Laser printer,CD-Rom Paul Arriola World Cup Jersey ,DVD-Rom,DVD-RAM High Power,high level of integration,low wavelength Low density,large diameter,low cost
Solar Cell GaAsGaAs Satellite broadcasting, communications,Unmanned meteorological stations
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