Properties of Aluminium Gallium Arsenide
The alloy system A1GaAs/GaAs is potentially of great importance for many high-speed electronics and optoelectronic devices, because the lattice parameter difference GaAs and A1GaAs is very small, which promises an insignificant concentration of undesirable interface states. Thanks to this prominent feature, a number of interesting properties and phenomena, such as high-mobility low-dimensional carrier gases, resonant tunnelling and fractional quantum Hall effect, have been found in the A1GaAs/GaAs heterostructure system. New devices, such as modulation-doped FETs, heterojunction bipolar transistors, resonant tunnelling transistors, quantum-well lasers, and other photonic and quantum-effect devices, have also been developed recently using this material system. These areas are recognized as not being the most interesting and active fields in semiconductor physics and device engineering.
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absorption acceptor AleaHAs alloy AlGaAs AlGaAs/GaAs alloy alloy composition aluminium AlXGaHAs Appl atoms band gap binding energy calculated carrier concentration cm'l coefﬁcient conduction band Conf constants Cryst decrease deep defect devices dielectric dislocations donor doped DX centres effective mass elastic electric field electron mobility emission epitaxy exciton experimental data ﬁeld function GaAs GaAs/AlGaAs Gallium Arsenide grown Growth Netherlands heterojunction heterostructures hole mobility hydrogen impurities increases indirect gap interface ionised layer Lett lifetime low temperature luminescence material measured MOCVD molecular beam epitaxy MOVPE observed obtained optical phonon oxide p-type phonon photoluminescence Phys plasma pressure quantum Raman range recombination reﬂectivity refractive index region reported reststrahlen room temperature S.Adachi samples scattering Semicond semiconductors Solid State Commun spectra structure studied substrate Superlattices surface TABLE technique Technol temperature dependence theoretical thermal transition undoped valence band valley values velocity