Aluminium gallium nitride


Aluminium gallium nitride is a semiconductor material. It is any alloy of aluminium nitride and gallium nitride.
The bandgap of AlxGa1−xN can be tailored from 3.4eV to 6.2eV.
AlGaN is used to manufacture light-emitting diodes operating in blue to ultraviolet region, where wavelengths down to 250 nm were achieved. It is also used in blue semiconductor lasers.
It is also used in detectors of ultraviolet radiation, and in AlGaN/GaN High-electron-mobility transistors.
AlGaN is often used together with gallium nitride or aluminium nitride, forming heterojunctions.
AlGaN layers are commonly grown on Gallium nitride, on sapphire or Si, almost always with additional GaN layers.

Safety and toxicity aspects

The toxicology of AlGaN has not been fully investigated. The AlGaN dust is an irritant to skin, eyes and lungs. The environment, health and safety aspects of aluminium gallium nitride sources and industrial hygiene monitoring studies of standard MOVPE sources have been reported recently in a review.