Wren, Ellen J., Mutkins, Karyn, Aljada, Muhsen, Burn, Paul L., Meredith, Paul, and Vamvounis, George (2010) The effect of dendronisation of arylamine centred chromophores on field effect transistor performance. Polymer Chemistry, 1 (7). pp. 1117-1126.

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Abstract

We report the design and synthesis of new dendronised hole transport materials and their first use in organic field effect transistors (OFETs) as solution processed amorphous channels. The dendrimers were comprised of a triphenylamine centre, core chromophores containing one or two thiophene units per arm, and first generation biphenyl dendrons with 2-ethylhexyloxy surface groups attached. The dendronised materials were found to be more easily processed than their non-dendronised equivalents. Top contact OFETS were fabricated and found to have hole mobilities in the saturated regime of 1.7 × 10−6 cm2 V−1 s−1 and 1.1 × 10−5 cm2 V−1 s−1 for dendrimers with one and two thiophene units in each arm of the chromophore, respectively. The devices had threshold voltages of around 10 V and ON/OFF ratios in the range 102 to 103. The OFET results demonstrate that for amorphous films it is important that the chromophore is as large as possible to allow for maximal intermolecular interactions.

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