Organic polymeric thin-film transistors fabricated by selective dewetting

Thin-film transistors (TFTs) of polymeric semiconductors were fabricated using selective dewetting in the patterning process. The process consists of: (i) patterning the wettability of the substrate using a protective layer of printed wax and a self-assembled monolayer, and (ii) patterning a polymeric semiconductor by selective dewetting from an organic solution. The method has been used to fabricate small arrays of TFTs with a regioregular poly(thiophene) and $\mathrm{poly}{\text{(9-9}}^{\prime }-\mathrm{dioctyl-fluorene-co-bithiophene}\mathrm{).}$ The TFTs exhibited mobilities of ${\text{0.5–1.0×10}}^{\text{−3}}\hspace{0.17em}{\mathrm{cm}}^2 {\mathrm{V}}^{\text{−1}} {\mathrm{s}}^{\text{−1}}$ and on-to-off ratios on the order of ${10}^4.$