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Published in:
01-09-2014
High crystallinity oligo(3-methylthiophenes) for p-channel organic field-effect transistors
Published in: Journal of Materials Science: Materials in Electronics | Issue 9/2014
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Abstract
A new type of oligo(3-methylthiophenes) with highly regiosymmetric chemical structure was presented for developing high performance and solution-processable organic field-effect transistors (OFETs). The representative molecule Br4MT, tetramer of the oligo(3-methylthiophenes), was synthesized through the oxidative cross-coupling reactions using Cu(II)-catalyst and fully characterized. The Br4MT exhibited remarkably high crystallinity and great ionization potential due to its unique molecular structure, evidenced by differential scanning calorimetry, electrochemical and X-ray diffraction studies. The solution-processed OFETs based on Br4MT achieved high hole mobility of up to 0.24 cm2/V/s with reasonable ambient stability, suggesting that the Br4MT had great potential for application in low-cost OFETs.