Interface Electronic Structure between Au and Black Phosphorus

The interface electronic structure between Au and black phosphorus has been investigated with ultraviolet and X-ray photoemission spectroscopy. We observed that Au clusters form at the initial Au deposition, and an interface dipole is observed at the interface between Au and BP. The outermost BP lattice is destroyed and unbonded P appears, which is due to the formation of metallic Au by the deposition of more than 8 A Au. The unbonded P is surface segregated at 8–15 A, and it is covered with further increasing of the Au thickness. These observations reveal the processes in the Au/BP interface and provide possible directions to fabricate high performance Au/BP-based device.