Effective anchoring energy in dipolar organic film on metals surfaces

The influence of electron injection from the metal electrode into organic liquid crystal dipolar film on the effective anchoring energy (EAE) of the polar organic film is discussed from the energy point of view. It is shown that the accounting for the injected carrier in organic film results in a polynomial function for the EAE expanded up to the fourth order in cos θs, where θs is the polar angle of the director n ˆ at the film/metal interface. It is also shown that in a certain range of the location of centroid of the injected carrier z ¯ the destabilizing surface polarization mechanism may lead to destruction of the linear anchoring strength coefficient w1. The strong influence of z ¯ on the quadratic term w2 also has been demonstrated.