Characterizing the Electronic Properties of CuPc/Gr/hBN Heterostructures

Copper Phthalocyanine (CuPc) is an molecular organic semiconductor with a non-zero magnetic moment. By depositing CuPc on a graphene/hBN electronic device, we find that the electronic properties of the original graphene/hBN heterostructure are significantly modified, revealed by a sign reversal of the magnetoresistance as well as the onset of an anisotropy in magnetic field. Differential conductance measurements show features that change with temperature, pointing to a rearrangement of the CuPc molecules on the graphene/hBN surface as the temperature is increased. Atomic Force Microscopy (AFM) show a different molecular arrangement of the CuPc molecules on graphene/h-BN with respect to hBN.