Control of Polymorphism and Morphology in Solution Sheared Organic Field-Effect Transistors

Adv. Funct. Mater. 2017, 1700526; DOI: 10.1002/adfm.201700526

Sergi Galindo, Adrián Tamayo, Francesca Leonardi, and Marta Mas-Torrent

Organic molecule semiconductors can be designed to be soluble in a variety of solvents so then they can be printed employing roll-to-roll techniques. However, one of the major drawbacks is to achieve high reproducibility of the electronic devices. Organic molecules, oppositely to inorganic materials, are bound to each other by weak intermolecular forces (i.e., van der Waals interactions). This makes molecules highly sensitive to structural modifications; that is, one molecular building block can lead to different crystal structures (i.e., polymorphs), which in turn will strongly affect the device electrical properties. Thus, the control of organic molecules organisation, both thin film morphology and crystal structure, is key to achieve a high device-to-device reproducibility.

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