  Among the van der Waals heterostructures, graphene/h-BN heterostructure is an
appropriate candidate for 2D nanoelectronic devices. In this paper, using
non-equilibrium molecular dynamics simulation approach, heat transport in
bilayer graphene/h-BN and graphene/h-BN van der Waals heterostructure (i.e.
h-BN flakes periodically inserted on the top and bottom of a graphene layer)
are explored. The results show that by increasing the length of the system, the
thermal conductivity of bilayer graphene/h-BN increases. Furthermore, it was
revealed that heat transport in graphene/h-BN heterostructure enhances compared
to that in monolayer graphene or monolayer h-BN. The size effect analysis shows
that the heat fluxes passing through each layer in bilayer graphene/h-BN
converges when the size of the system is larger than 100 nm. The results can
improve the understanding heat transfer phenomena in the van der Waals
heterostructures and improve designing of heterostructures for better thermal
management and heat dissipation.
