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Ho, Dongil,Vegiraju, Sureshraju,Choi, Donghee,Cho, Chang-Hui,Kwon, Guhyun,Huang, Po-Chun,Lee, Gene-Hsiang,Earmme, Taeshik,Yau, Shueh Lin,Chen, Ming-Chou,Kim, Choongik Elsevier 2019 Dyes and pigments Vol.163 No.-
<P><B>Abstract</B></P> <P>Solution-processable thioalkylated bithiophene derivatives with different lengths of side chains (<B>SBT-n</B>; <B>n</B> = <B>10</B>, <B>12</B>, <B>14</B>, <B>16</B>, <B>18</B>) have been synthesized and characterized as p-channel organic semiconductors for thin-film transistors (TFTs). Based on a combination of the highest performing SBT derivative (<B>SBT-14</B>) and quinoidals (<B>DTTRQ</B>s) as p- and n-channel materials, solution-processed small-molecular bulk heterojunction (BHJ) ambipolar thin-film transistors were fabricated, and the resulting devices showed air-stable and high ambipolar performance with well-balanced electron and hole mobilities as high as 0.70 cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP> and 0.21 cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP>, respectively. Furthermore, complementary-like inverters comprising two ambipolar thin-film transistors were demonstrated, which exhibited a high voltage gain of up to 81. Our study clearly demonstrated that side chain engineering of small molecular organic semiconductors had a significant influence on the electrical performance of TFTs and BHJ transistors, as well as complementary-like inverters.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Solution-processable thioalkylated bithiophene derivatives are synthesized. </LI> <LI> Ambipolar transistors are fabricated based on bulk heterojunction small molecules. </LI> <LI> High electrical performance with carrier mobilities of 0.21–0.70 cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP> is achieved. </LI> <LI> Complementary-like inverters based on bulk-heterojunction transistors show high transfer gain of 81. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>