title: Large-Scale Graphene on Hexagonal-BN Hall Elements: Prediction of Sensor Performance without Magnetic Field.
abstract: A graphene Hall element (GHE) is an optimal system for a magnetic sensor because of its perfect two-dimensional (2-D) structure, high carrier mobility, and widely tunable carrier concentration. Even though several proof-of-concept devices have been proposed, manufacturing them by mechanical exfoliation of 2-D material or electron-beam lithography is of limited feasibility. Here, we demonstrate a high quality GHE array having a graphene on hexagonal-BN (h-BN) heterostructure, fabricated by photolithography and large-area 2-D materials grown by chemical vapor deposition techniques. A superior performance of GHE was achieved with the help of a bottom h-BN layer, and showed a maximum current-normalized sensitivity of 1986 V/AT, a minimum magnetic resolution of 0.5 mG/Hz(0.5) at f = 300 Hz, and an effective dynamic range larger than 74 dB. Furthermore, on the basis of a thorough understanding of the shift of charge neutrality point depending on various parameters, an analytical model that predicts the magnetic sensor operation of a GHE from its transconductance data without magnetic field is proposed, simplifying the evaluation of each GHE design. These results demonstrate the feasibility of this highly performing graphene device using large-scale manufacturing-friendly fabrication methods.
authors: Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS) , Suwon 16419, Republic of Korea.|Department of Energy Science, Sungkyunkwan University , Suwon 16419, Republic of Korea.
authors: Min-Kyu
authors: MK
authors: Joo
authors: Department of Energy Science, Sungkyunkwan University , Suwon 16419, Republic of Korea.
authors: Joonggyu
authors: J
authors: Kim
authors: Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS) , Suwon 16419, Republic of Korea.
authors: Ji-Hoon
authors: JH
authors: Park
authors: Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS) , Suwon 16419, Republic of Korea.
authors: Van Luan
authors: VL
authors: Nguyen
authors: Department of Energy and Materials Engineering, Dongguk University , Seoul 04620, Republic of Korea.
authors: Ki Kang
authors: KK
authors: Kim
authors: Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS) , Suwon 16419, Republic of Korea.|Department of Energy Science, Sungkyunkwan University , Suwon 16419, Republic of Korea.
authors: Young Hee
authors: YH
authors: Lee
authors: Department of Energy Science, Sungkyunkwan University , Suwon 16419, Republic of Korea.
authors: Dongseok
authors: D
authors: Suh
keywords: chemical vapor deposition; graphene; graphene Hall element; hexagonal boron nitride; large-area graphene device; magnetic field sensor