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・ Aluminium carbide
・ Aluminium carbonate
・ Aluminium chloride
・ Aluminium chloride (data page)
・ Aluminium chlorohydrate
・ Aluminium clofibrate
・ Aluminium diacetate
・ Aluminium diboride
・ Aluminium diethyl phosphinate
・ Aluminium dodecaboride
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・ Aluminium fluoride
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Aluminium gallium arsenide
・ Aluminium gallium indium phosphide
・ Aluminium gallium nitride
・ Aluminium gallium phosphide
・ Aluminium glycinate
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・ Aluminium Hormozgan F.C.
・ Aluminium hydride
・ Aluminium hydroxide
・ Aluminium hydroxide oxide
・ Aluminium in Africa
・ Aluminium indium arsenide
・ Aluminium Industrie Vaassen BV v Romalpa Aluminium Ltd
・ Aluminium industry in the United States
・ Aluminium iodide


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Aluminium gallium arsenide : ウィキペディア英語版
Aluminium gallium arsenide

Aluminium gallium arsenide (also aluminum gallium arsenide) (AlxGa1-xAs) is a semiconductor material with very nearly the same lattice constant as GaAs, but a larger bandgap. The ''x'' in the formula above is a number between 0 and 1 - this indicates an arbitrary alloy between GaAs and AlAs.
The bandgap varies between 1.42 eV (GaAs) and 2.16 eV (AlAs). For x < 0.4, the bandgap is direct.
The refractive index is related with the bandgap via the Kramers–Kronig relations and varies between 2.9 (x = 1) and 3.5 (x = 0). This allows the construction of Bragg mirrors used in VCSELs and RCLEDs.
The formula ''AlGaAs'' should be considered an abbreviated form of the above, rather than any particular ratio.
Aluminium gallium arsenide is used as a barrier material in GaAs based heterostructure devices. The AlGaAs layer confines the electrons to a gallium arsenide region. An example of such a device is a quantum well infrared photodetector (QWIP).
It is commonly used in GaAs-based red- and near-infra-red-emitting (700nm-1100nm) double-hetero-structure laser diodes.
==Safety and toxicity aspects==
The toxicology of AlGaAs has not been fully investigated. The dust is an irritant to skin, eyes and lungs. The environment, health and safety aspects of aluminium gallium arsenide sources (such as trimethylgallium and arsine) and industrial hygiene monitoring studies of standard MOVPE sources have been reported recently in a review.


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