By surrounding graphene with layers of black phosphorus and black arsenic, researchers have calculated the parameters of a graphene-based radiation detector that could lead to advances in everything from airport X-ray baggage scanners to remote controls to heartbeat sensors.
The sensors would be capable of having their sensitivity to different light wavelengths adjusted, allowing them to take the place of far-infared and tetrahertz radiation detectors, according to Graphene-info. Far-infrared light waves are emitted by cosmic dust, and infrared light sensors can be found in technology like night vision goggles and homing missiles.
The researchers found that by adjusting the ratios of black phosphorus and black arsenic surrounding a graphene monolayer, and by applying electrical current in varying voltages, they could alter the working range of the photodetector.
“We calculated the parameters of the light-sensitive elements for far-infrared detection based on a graphene monolayer. Such devices can replace almost any far-infrared and terahertz radiation sensors used today,” Victor Ryzhii, head of 2D Materials and Nanodevices Laboratory told Graphene-info.