Thieno[3,4‑<i>c</i>]pyrrole-4,6-dione
Containing Copolymers for High Performance Field-Effect Transistors
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Abstract
Thieno[3,4-<i>c</i>]pyrrole-4,6-dione
(TPD) containing copolymer semiconductors <b>P1–P3</b> were strategically designed and successfully synthesized. Their
physicochemical properties were thoroughly investigated. All polymers
exhibited good solution processability and high humidity stability
in thin film transistors (TFTs). Transistor electrical characterization
showed the device performance was sensitive to the alkyl chain substituent
orientations of the polymers. A maximum TFT hole mobility of ∼1.29
cm<sup>2</sup>/(V s) was observed for <b>P3</b>-based devices,
a recorded mobility for TPD containing polymer semiconductors reported
to date. The corresponding thin-film morphologies and polymer chains
packing were investigated in detail by AFM and 2D-GIXD to correlate
with the alkyl orientation-dependent carrier mobility of <b>P1–P3</b>. Experimental results showed the alkyl chain orientations determined
the polymer chains packing pattern in the thin films, the film morphologies,
and the resulting device performances of <b>P1–P3</b>