Figure 2 : Exemplary results of the iterative electrostatic model.

From: Organic semiconductor density of states controls the energy level alignment at electrode interfaces

Figure 2

(a) Calculated charge density ρ(z), and (b) electron potential energy −eV(z) within a d=30 nm thick (≈20 layer) pentacene film. Surface sensitive experimental methods (for example, UPS or Kelvin probe) only determine the total electron potential energy drop −eV(d) across the entire organic-semiconductor film. (c) −eV(z) for a range of different film thicknesses d up to 30 nm, highlighting that the series of experimentally determined −eV(d), shown as line connecting open circles, does not reproduce the band-bending −eV(z) within the organic semiconductor for any thickness.