We
present molecular beam epitaxial growth of blue phosphorene
(BlueP), a new allotrope of black phosphorene, on Au(111) and its
surface functionalization with fullerene (C60) molecules
by low-temperature scanning tunneling microscopy and scanning tunneling
spectroscopy (STS). In contrast to the well-ordered aggregation on
conventional surfaces, C60 molecules favor to adsorb at
the domain boundaries of BlueP and create defects and a disordered
phase nearby. STS reveals a shift of the conduction band minimum of
BlueP and a remarkable broadening of the lowest unoccupied molecular
orbital of C60, indicating an interfacial charge transfer.
In addition, codeposition of C60 with phosphorous precursors
on Au(111) followed by annealing generates a new reconstruction of
BlueP comprising larger triangles and higher density of dislocation
lines that are favorable for anchoring bulky C60 balls.