In summary, we find that the electric field impacts the adsorption energy of isolated molecules in various ways: (i) The charges and dipoles of the interface system have a potential energy in the electric field that depends strongly on the adsorption geometry (E geom ). (ii) To minimize this energy charges in the system are rearranged, which changes the bond of the adsorbates to the substrate. Both (i) and (ii) favor the standing adsorption geometry for field F > 0 V nm -1 , thereby stabilizing it over the lying molecule.