3 years ago

High-Mobility, Ultrathin Organic Semiconducting Films Realized by Surface-Mediated Crystallization

High-Mobility, Ultrathin Organic Semiconducting Films Realized by Surface-Mediated Crystallization
F. May, U. Pietsch, Zarah Molla, T. Geßner, R. T. Weitz, M. Kühn, S. Grigorian, I. Vladimirov, L. S. Schaffroth, M. Kellermeier
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 liquid–air 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 cm2/(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.

Publisher URL: http://dx.doi.org/10.1021/acs.nanolett.7b03789

DOI: 10.1021/acs.nanolett.7b03789

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