Hall-effect sensors based on ALGAN/GAN heterojunctions on Si substrates for a wide temperature range

Kumar, S and Muralidharan, R and Narayanan, G (2021) Hall-effect sensors based on ALGAN/GAN heterojunctions on Si substrates for a wide temperature range. In: IET Circuits, Devices and Systems .

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Abstract

The authors report experimental investigations on Hall sensors based on AlGaN/GaN heterojunctions grown on silicon 111 (Si 111) substrates. Realisation of two-dimensional electron gas-based Hall sensors on Si substrates can have the advantages of low cost and integrability with complementary metal-oxide semiconductor circuits. Design and fabrication of such Hall sensors and their characterisation over a wide temperature range of 75 to 500 K are reported. The authors experimentally investigate the temperature dependence of the transresistances, sheet resistance and current-related sensitivity (or gain) of such Hall sensors. The current-related sensitivity is shown to be reasonably constant over the complete temperature range and certain inevitable variations in current-related sensitivity can easily be compensated. The temperature dependence of the transresistance can be used for such compensation. The variation of the geometrical correction factor of the Hall sensor with the applied magnetic field strength and the operating temperature is also studied. The authors also demonstrate the possibility of realising Hall sensors with a high geometrical correction factor (�0.97), which is practically insensitive to variations in temperature (�2 from 75 to 500 K) and applied magnetic field, for applications such as in electromechanical devices. © 2021 The Authors. IET Circuits, Devices & Systems published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology.

Item Type:	Journal Article
Publication:	IET Circuits, Devices and Systems
Publisher:	John Wiley and Sons Inc
Additional Information:	The copyright for this article belongs to the authors.
Keywords:	Aluminum gallium nitride; CMOS integrated circuits; Electromechanical devices; Gallium nitride; Hall effect transducers; Heterojunctions; III-V semiconductors; Magnetic fields; Metals; MOS devices; Oxide semiconductors; Sensitivity analysis; Temperature distribution; Two dimensional electron gas; Wide band gap semiconductors, AlGaN/GaN heterojunction; Applied magnetic fields; Complementary metal oxide semiconductors; Experimental investigations; Geometrical correction; Operating temperature; Temperature dependence; Wide temperature ranges, Substrates
Department/Centre:	Division of Electrical Sciences > Electrical Engineering Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	07 Jul 2021 06:51
Last Modified:	07 Jul 2021 06:51
URI:	http://eprints.iisc.ac.in/id/eprint/68733

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