Crystals of Nonfullerene Acceptors Generated by Rich Exposure to Solvent Vapors

In present day, nonfullerene acceptors play a significant role in the fabrication of various energy devices, with their optoelectronic properties being highly dependent on the molecular arrangements at nano- and microscales. In this work, we report on the fabrication of novel (single) crystals of Y6 and Y12 nonfullerene acceptors by exposing the latter to generous amounts of solvent vapors, which in turn favors nucleation and growth of crystals at various, yet highly controlled solvent evaporation rates. Fabricated crystals display various shapes and sizes, exhibit puzzling absorbance properties, and could potentially be employed in the field of optoelectronic devices, including organic field-effect transistors.