Figure 7.

a) Charge transfer doping of graphene in WO_x/graphene heterostructures. Reproduced with permission.^{[ 19 ]} Copyright 2021, Springer Nature. b) Tunable charge transfer doping of graphene using vdW interlayers: p‐ and n‐type doping using WO_x and ZrO_x charge‐transfer dopants, respectively.^{[ 113 ]} Copyright 2023, Springer Nature. c) Self‐aligned vdW top gate combined with local WO_x dopants near electrical contacts. Reproduced with permission.^{[ 130 ]} Copyright 2023, American Chemistry Society.