Hole Doping to Perylene on Au(110): Photoelectron Momentum Microscopy

Abstract

Photoemission spectroscopy of the perylene layers on the Au(110) surface was performed using a momentum microscope. The two-dimensional momentum maps of the perylene monolayer exhibit a “binary star” pattern with two asymmetric bright spots for the electrons from the highest occupied molecular orbital of perylene, reflecting the tilted molecular orientation. This pattern was absent for the perylene multilayer and the Br-doped monolayer because of the random orientation of the molecules in these layers. Br doped to the perylene monolayer facilitated hole injection in perylene, and the electrons attributable to the singly occupied molecular orbital were observed at binding energies of 1.0—1.5 eV.