The electronic properties of nickel phosphide surfaces: Angle-resolved and resonant photoemission studies

► The photoemission spectra of Ni2P consist of a Ni 3d-P 3p hybrid band and a satellite. ► The satellite is associated with photoemission leading to a two-hole bound state. ► A P 3p-induced surface state is formed on Ni2P(101¯0). ► The P segregation to the surface is brought about by annealing at 260-330 °C. ► The 3d levels of surface Ni atoms are stabilized by bonding with segregated P atoms.