  Understanding the morphology formation process of solution-cast photoactive
layers (PALs) is crucial to derive design rules for optimized and reliable
third generation solar cell fabrication. For this purpose, a Phase-Field (PF)
computational framework dedicated to the simulation of PAL processing has
recently been developed. In this study focused on non-evaporating,
crystallizing binary mixtures, distinct crystalline morphology formation
pathways are characterized by a systematic exploration of the model's parameter
space. It is identified how, depending on material properties, regular,
dilution-enhanced, diffusion-limited and demixing-assisted crystallization can
take place, and which associated structures then arise. A comprehensive
description of the thermodynamic and kinetic mechanisms that respectively drive
these separate crystallization modes is provided. Finally, comparisons with
experimental results reported in the literature highlight the promising
potential of PF simulations to support the determination of process-structure
relationships for improved PAL production.
