Organic Semiconductors for Solution‐Processable Field‐Effect Transistors (OFETs)

Abstract The cost‐effective production of flexible electronic components will profit considerably from the development of solution‐processable, organic semiconductor materials. Particular attention is focused on soluble semiconductors for organic field‐effect transistors (OFETs). The hitherto differentiation between “small molecules” and polymeric materials no longer plays a role, rather more the ability to process materials from solution to homogeneous semiconducting films with optimal electronic properties (high charge‐carrier mobility, low threshold voltage, high on/off ratio) is pivotal. Key classes of materials for this purpose are soluble oligoacenes, soluble oligo‐ and polythiophenes and their respective copolymers, and oligo‐ and polytriarylamines. In this context, micro‐ or nanocrystalline materials have the general advantage of somewhat higher charge‐carrier mobilities, which, however, could be offset in the case of amorphous, glassy materials by simpler and more reproducible processing.