Flexible Organic Electrolyte-Gated Transistors Based on Thin Polymer Blend Films of Crystalline C8-BTBT and Amorphous PTAA


Thin films of polymer blends consisting of a crystalline small-molecular semiconductor, 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene (C8-BTBT), and an amorphous polymer semiconductor, poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA), are studied and applied to organic electrolyte-gated transistors (OEGTs). The compositions can be easily controlled by adjusting the mixing ratios of the solutions in chloroform. In the thin-film state, PTAA acts as a structural matrix and a charge-transport bridge for C8-BTBT grains. The C8-BTBT:PTAA blends have a compositional effect on the thin-film properties and performance of OEGTs. As a result, the C8-BTBT:PTAA blend films with weight ratios of 8:2 exhibit a hole mobility twice that of pristine C8-BTBT films. Moreover, OEGTs based on the C8-BTBT:PTAA blend exhibit better charge-transport properties on flexible plastic substrates under bending conditions, compared to flat devices.

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Correspondence to Felix Sunjoo Kim.

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Acknowledgments: This research was supported by the “Cooperative Research Program for Agriculture Science and Technology Development (Project No. PJ01281001)” of the Rural Development Administration of Korea. This work was also supported by the Chung-Ang University Graduate Research Scholarship in 2019.

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Bae, O., Kim, F.S. Flexible Organic Electrolyte-Gated Transistors Based on Thin Polymer Blend Films of Crystalline C8-BTBT and Amorphous PTAA. Macromol. Res. 28, 677–682 (2020). https://doi.org/10.1007/s13233-020-8118-9

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  • small-molecular semiconductor
  • polymer blend
  • organic electrolyte-gated transistor
  • flexible electronic device
  • bending test