Work function, band bending, and electron affinity in surface conducting (100) diamond

The change in electron affinity and band bending as a result of atmosphere and fullerene (C60F48) induced surface conductivity on H-terminated (100) diamond is determined by simultaneously measuring the work function (ϕ) and C1s core level shift for both intrinsic and boron doped diamond. Changes in work function as a result of surface transfer doping are shown to not only reflect variations in the position of the surface Fermi level as reported by earlier investigations but also changes in the electron affinity, with the latter accounting for up to 0.63 eV of the highest observed change in ϕ of 1.45 eV.