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(680～630nm) | 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 | |||
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