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The energy level alignment of CuPc and FePc on single-layer graphene/Ni(111)(SLG/Ni)substrate was investigated by using ultraviolet and X-ray photoelectron spectroscopy(UPS and XPS).The highest occupied molecular orbitals(HOMOs)in a thick layer of CuPc and FePc lie at 1.04 eV and 0.90 eV,respectively,below the Fermi level of the SLG/Ni substrate.Weak adsorbate–substrate interaction leads to negligible interfacial dipole at the CuPc/SLG/Ni interface,while a large interfacial dipole(0.20 eV)was observed in the case of FePc/SLG/Ni interface,due to strong adsorbate–substrate coupling.In addition,a new interfacial electronic feature was observed for the first time in the case of FePc on SLG/Ni substrate.This interfacial state can be attributed to a charge transfer from the SLG/Ni substrate to unoccupied orbitals of FePc.
The energy level alignment of CuPc and FePc on single-layer graphene / Ni (111) (SLG / Ni) substrate was investigated by using ultraviolet and X-ray photoelectron spectroscopy (UPS and XPS) a thick layer of CuPc and FePc lie at 1.04 eV and 0.90 eV, respectively, below the Fermi level of the SLG / Ni substrate. Weak adsorbate-substrate interaction leads to negligible interfacial dipole at the CuPc / SLG / Ni interface, while a large A new interfacial dipole (0.20 eV) was observed in the case of FePc / SLG / Ni interface, due to strong adsorbate-substrate coupling. In addition, a new interfacial electronic feature was observed for the first time in the case of FePc on SLG / Ni substrate. This interfacial state can be attributed to a charge transfer from the SLG / Ni substrate to unoccupied orbitals of FePc.