4 research outputs found
High-Mobility, Ultrathin Organic Semiconducting Films Realized by Surface-Mediated Crystallization
The
functionality of common organic semiconductor materials is
determined by their chemical structure and crystal modification. While
the former can be fine-tuned via synthesis, a priori control over
the crystal structure has remained elusive. We show that the surface
tension is the main driver for the plate-like crystallization of a
novel small organic molecule n-type semiconductor at the liquidâair
interface. This interface provides an ideal environment for the growth
of millimeter-sized semiconductor platelets that are only few nanometers
thick and thus highly attractive for application in transistors. On
the basis of the novel high-performance perylene diimide, we show
in as-grown, only 3 nm thin crystals electron mobilities of above
4 cm<sup>2</sup>/(V s) and excellent bias stress stability. We suggest
that the established systematics on solvent parameters can provide
the basis of a general framework for a more deterministic crystallization
of other small molecules