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In the present work, we study morphologies arising due to competing substrateinteraction, electric field and confinement effects on a symmetric diblockcopolymer. We employ a coarse grained non-local Cahn-Hilliard phenomenologicalmodel taking into account the appropriate contributions of substrateinteraction and electrostatic field. The proposed model couples theOhta-Kawasaki functional with Maxwell equation of electrostatics, thusalleviating the need for any approximate solution used in previous studies. Wecalculate the phase diagram in electric field-substrate strength space fordifferent film thicknesses. In addition to identifying the presence ofparallel, perpendicular and mixed lamellae phases similar to analyticalcalculations, we also find a region in the phase diagram where hybridmorphologies (combination of two phases) coexist. These hybrid morphologiesarise either solely due to substrate affinity and confinement or are induceddue to the applied electric field. The dependence of the critical fields fortransition between the various phases on substrate strength, film thickness anddielectric contrast is discussed. Some preliminary 3D results are alsopresented to corroborate the presence of hybrid morphologies.

Influence of substrate interaction and confinement on electric field induced transition in symmetric block copolymer thin films