Organic electronics have attracted considerable interest over the last decades promising an alternative to conventional, inorganic electronics platforms. To fully exploit the touted potential of this plastic electronics platform, however, other prerequisites need now to be fulfilled: for example, good mechanical stability, ease of processing and device reliability. A possible method to overcome these issues is the employment of insulating:semiconducting polymers blends, which have been demonstrated to display favourable rheological and mechanical properties without negatively affecting the electric performance.1–4
In this work we show how this approach can be extended in order to produced self-standing, fully printed, top-gate top-contact transistors as a possible route towards melt processed fully printed field-effect transistors. We selected here high-density polyethylene (HDPE) as the insulating polymer, since it is one of the most extensively used commodity polymers for the production of industrial thin films. We show how HDPE can be blended with commonly used semiconducting polymers and processed by solution and melt to achieve high efficiency OFETs.
1. Scaccabarozzi, A. D., & Stingelin, N. Semiconducting:insulating polymer blends for optoelectronic applications—a review of recent advances. Journal of Materials Chemistry A, 2, (28), 10818 (2014)
2. Müller, C. et al. Tough, Semiconducting Polyethylene-poly(3-hexylthiophene) Diblock Copolymers. Advanced Functional Materials 17, 2674–2679 (2007).
3. T. A. Ferenczi, C. Müller, D. D. C. Bradley, P. Smith, J. Nelson, and N. Stingelin, “Organic semiconductor:insulator polymer ternary blends for photovoltaics.,” Advanced materials (Deerfield Beach, Fla.), 23, (35), 4093-7, (2011)
4. Wolfer, P., Müller, C., Smith, P., Baklar, M.A. & Stingelin-Stutzmann, N., “α-quaterthiophene-polyethylene blends: phase behaviour and electronic properties” Synth. Met. 157, 827 (2007)