An indigo-based polymer bearing thermocleavable side chains for n-type organic thin film transistors?

Journal of Materials Chemistry C Pub Date: 2015-04-14 DOI: 10.1039/C5TC00512D

Abstract

A new n-type semiconducting polymer based on indigo having thermocleavable tert-butoxycarbonyl (t-Boc) groups was synthesized and used as an active layer in organic thin film transistors (OTFTs). Twisting of the polymer main chain due to the presence of the bulky t-Boc groups renders this indigo-based polymer highly soluble. A post-deposition thermal treatment at a temperature above 170 °C could remove the t-Boc groups to retrieve the highly coplanar geometry of the unsubstituted indigo units. The thermally annealed polymer semiconductor films at 200 °C showed an electron mobility of up to ～6 × 10?3 cm2 V?1 s?1 in OTFTs, which is a 5-fold increase compared to that of the indigo-based polymers reported previously due to the retrieved high backbone coplanarity.

Graphical abstract: An indigo-based polymer bearing thermocleavable side chains for n-type organic thin film transistors
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