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Stimulated by experimental evidence in the field of solution--born thinfilms, we study the morphology formation in a three state lattice systemsubjected to the evaporation of one component. The practical problem that weaddress is the understanding of the parameters that govern morphology formationfrom a ternary mixture upon evaporation, as is the case in the fabrication ofthin films from solution for organic photovoltaics. We use, as a tool, ageneralized version of the Potts and Blume-Capel models in 2D, with the MonteCarlo Kawasaki-Metropolis algorithm, to simulate the phase behaviour of aternary mixture upon evaporation of one of its components. The components withspin $+1$, $-1$ and $0$ in the Blume-Capel dynamics correspond to theelectron--acceptor, electron--donor and solvent molecules, respectively, in aternary mixture used in the preparation of the active layer films in an organicsolar cell. Further, we introduce parameters that account for the relativecomposition of the mixture, temperature, and interaction between the species inthe system. We identify the parameter regions that are prone to facilitate thephase separation. Furthermore, we study qualitatively the types of formedconfigurations. We show that even a relatively simple model, as the presentone, can generate key morphological features, similar to those observed inexperiments, which proves the method valuable for the study of complex systems.

A lattice model approach to the morphology formation from ternary mixtures during the evaporation of one component