Symposium FF04—Crystal Engineering of Functional Materials—Solution-Based Strategies
Solution processing of functional materials, including conjugated polymers and small molecules, metal-halide perovskites, colloids and quantum dots, enables the large-scale, high-throughput manufacturing of a broad range of optoelectronic devices, from flexible solar panels to disposable sensors. Compatibility with rapid processing that render this class of materials advantageous from a manufacturing standpoint, however, present unique challenges in controlling active layer morphologies for optimum device performance. Because these systems are chemically complex and evolve on short time scales during solvent evaporation, morphological heterogeneities/defects that form during solution deposition are one of the most significant bottlenecks facing the commercialization of such devices. Solution-based strategies to control crystallization outcomes, including the extent of crystallinity, crystal size and orientation, polymorphism, etc., are thus critical to the advancement of this field.
This symposium will cover the latest discoveries in 1) fundamental mechanisms governing the structural evolution of solution-processable functional materials, 2) processing strategies to control solution-phase nucleation/crystallization processes in order to evoke desired crystallization outcomes, 3) emerging methods to probe crystallization and materials structure during processing, and 4) structure-function relationships between crystallization outcomes and optoelectronic processes, e.g. light absorption, exciton generation and diffusion, charge transport, etc. Recent insights into the role of molecular structure, solvent interactions, and external forces, e.g. shear, electric and magnetic fields, etc., in determining final film morphology and device performance from both experiments and simulations will be highlighted.