Hall sensors batch-fabricated on all-CVD h-BN/graphene/h-BN heterostructures

TL;DR

This paper demonstrates scalable batch-fabrication of high-performance Hall sensors on all-CVD grown h-BN/graphene/h-BN heterostructures, showing stable operation and promising for practical applications.

Contribution

It introduces a scalable method for fabricating all-CVD 2D material heterostructure-based Hall sensors with high sensitivity and stability.

Findings

Achieved current-related Hall sensitivities up to 97 V/AT at room temperature.

Demonstrated stable sensor performance over six months in ambient conditions.

Established a pathway for scalable production of 2D material-based electronic sensors.

Abstract

The two-dimensional (2D) material graphene is highly promising for Hall sensors due to its potential of having high charge carrier mobility and low carrier concentration at room temperature. Here, we report the scalable batch-fabrication of magnetic Hall sensors on graphene encapsulated in hexagonal boron nitride (h-BN) using commercially available large area CVD grown materials. The all-CVD grown h-BN/graphene/h-BN van der Waals heterostructures were prepared by layer transfer technique and Hall sensors were batch-fabricated with 1D edge metal contacts. The current-related Hall sensitivities up to 97 V/AT are measured at room temperature. The Hall sensors showed robust performance over the wafer scale with stable characteristics over six months in ambient environment. This work opens avenues for further development of growth and fabrication technologies of all-CVD 2D material heterostructures and allows further improvements in Hall sensor performance for practical applications.