Redefining Hall-Effect sensors with graphene: Page 4 of 5

July 25, 2020 //By Simon Thomas, Paragraf
Analysis of a wafer of graphene Hall-Effect sensors
A new graphene manufacturing process is opening up opportunities for Hall-Effect sensors says Simon Thomas, CEO of Paragraf
the active sensing element in each device is comprised of a single atom-thick graphene monolayer, the influence of the planar Hall Effect has been eliminated. These devices deliver 30x greater sensitivity than the conventional silicon-based options and have better operational stability. Their clear benefits will make them appealing to scientific research, healthcare, avionics, automotive, satellite production, robotics and numerous other industry sectors.   

These sensors can support resolution figures that are down at nT without the need for flux concentrators or the addition signal conditioning ICs (to amplify or filter the signal). This means the system complexity can be reduced and the overall bill-of-materials cost is kept in check.

These devices can be used in a broad range of magnetic fields - reaching all the way up to ±9T. Their elevated mobility translates into faster responsiveness and a wider dynamic range. They also have far better linearity (with less than 0.5% deviation normally). Capable of operating down to 10nA, they have a substantially lower power budget than conventional sensor devices.

Another key advantage of graphene-based Hall-Effect sensors is the wide temperature range they can support. The sensors can be used in cryogenic application settings of -271°C all the way up to the 80°C temperatures expected in automotive and industrial use cases. Moreover, higher temperature variants are currently under development which will further extend the possibilities that these devices can address.

Thanks to the mechanical strength of graphene, these new Hall-Effect sensors exhibit exceptional robustness, which means that a prolonged operational lifespan is assured. Resilience to electro-static discharge (ESD) enables them to be used in the most uncompromising of environments. The low power dissipation of these sensors (which is in the order of pW) means they will not heat cryogenic environments.


Performing measurements on packaged graphene Hall-Effect sensors 

Conclusion

There are certain shortfalls that are inherent to standard Hall-Effect sensor devices - in terms of their sensitivity, accuracy and the effect that


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