Interfacial Electronic Structure At Rubrene/Nife Heterostructure

The interface electronic structure between rubrene and permalloy (Ni80Fe20) has been studied by ultraviolet photoelectron spectroscopy (UPS) and X-ray photoelectron spectroscopy (XPS). We find that the downward energy level bending at the rubrene/NiFe heterostructure is caused by the interaction between rubrene and NiFe at the interface. There is an interface dipole of 0.23 eV, pointing from NiFe to rubrene. Our researches deepen the understanding of the fundamentals and laid a foundation for the design of high-performance rubrene-based organic spintronic devices.