The semiconducting properties of polyalkythiophene as field-effect transistors were investigated. Polymethylbutylthiophene had a high field-effect mobility on the order of 10-3 cm2/Vs. However, this is lower than that of polyhexylthiophene, most likely because of the longer π-π stacking distance due to the introduction of branches on the sidechains. Polythiophenes with bulky or H-bonding carboxylic acid sidechains do not form self-assembled crystalline films, yielding very low field-effect mobilities. The nature of the sidechains affects the self-assembly, crystallization, and semiconducting properties of polyalkylthiophene derivatives. Only polythiophenes with non-sterically-hindered linear sidechains produce high crystallinity and high transistor performance.
|Number of pages
|American Chemical Society, Polymer Preprints, Division of Polymer Chemistry
|Published - Aug 1999
ASJC Scopus subject areas
- Polymers and Plastics