Organic semiconductors are of high interest due to a promise of low cost, flexible electronics. Research has shown that the solid state packing of organic semiconductors has an impact on their electrical properties. Organic semiconductors tend to pack in a herringbone motif which maximizes C-H-p interactions. A more ideal packing motif is co-facial, which maximizes orbital-orbital interactions between adjacent molecules. Our research has shown that the addition of a semiconducting co-crystal former (SCCF) can have a positive impact on the solid state packing of an organic semiconductor. In this approach, we co-crystallize a pyridine-handled organic semiconductor with a hydroxyl functionalized SCCF such that the arrangement of the semiconductor is directed by hydrogen bonds. Owing to the unpredictability of crystal packing, we have explored different possible SCCF's. Here, we report initial findings on how the addition of different carboxylic acids affects the solid-state packing of thiophene based semiconductors.

Semiconductor co-crystals based on carboxylic acids

240th National Meeting (2010)

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