Incorporation of Thieno[3,2‑<i>b</i>]pyrrole into Diketopyrrolopyrrole-Based Copolymers for Efficient Organic Field Effect Transistors

Published on 2018-05-16T12:40:57Z (GMT) by
Recent advancements in organic field effect transistors have switched chemists’ focus from synthesizing libraries of organic semiconductors to a more targeted approach where chemical alterations are performed on known semiconductors to further improve electronic properties. Among successful semiconducting polymer candidates, copolymers based on diketopyrrolopyrrole-and thieno­[3,2-<i>b</i>]­thiophene [<b>P­(DPP-TT)</b>] have been subjected to modifications on the diketopyrrolopyrrole unit by using flanking groups and side chain engineering. Thieno­[3,2-<i>b</i>]­thiophene moiety, however, has seen minimal modifications due to the limited number of modifying sites. Isoelectronic thieno­[3,2-<i>b</i>]­pyrrole could serve as an alternative since it is easily tunable via N-alkylation reactions. Therefore, for the first time, we report the replacement of the thieno­[3,2-<i>b</i>]­thiophene unit of <b>P­(DPP-TT)</b> with thieno­[3,2-<i>b</i>]­pyrrole unit and its performance in p-channel field effect transistors. The copolymer exhibits linear characteristics to achieve a relatively high average hole mobility of 0.12 cm<sup>2</sup> V<sup>–1</sup> s<sup>–1</sup> in bottom-gate/top-contact field effect transistors with threshold voltages as low as 0 V. These preliminary results highlight the potential of this thieno­[3,2-<i>b</i>]­pyrrole monomer for utilization in organic field effect transistors.

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Bulumulla, Chandima; Kularatne, Ruvanthi N.; Gunawardhana, Ruwan; Nguyen, Hien Q.; McCandless, Gregory T.; Biewer, Michael C.; Stefan, Mihaela C. (2018): Incorporation of Thieno[3,2‑b]pyrrole into Diketopyrrolopyrrole-Based Copolymers for Efficient

Organic Field Effect Transistors. ACS Publications. Collection.