Conjugated Polymer Controlled Morphology and Charge Transport of Small-Molecule Organic Semiconductors.

Scientific Reports
Zhengran HeDawen Li

Abstract

In this study, we report an effective approach to tune the crystallization, microstructure and charge transport of solution-processed organic semiconductors by blending with a conjugated polymer additive poly(3-hexylthiophene) (P3HT). When 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS pentacene) was used as a model semiconductor material to mix with different amount of P3HT, their intermolecular interactions led to distinctive TIPS pentacene film morphologies, including randomly-oriented crystal ribbons, elongated needles with enhanced long-range order, and grass-like curved microwires with interlinkages. Each type of morphology was found to further correlate to considerably different charge transport and device performance. As compared to pristine TIPS pentacene devices, bottom-gate, top-contact OTFTs with 2% in weight P3HT additive showed a 2-fold and 5-fold improvement of average field-effect mobility and performance consistency (defined as the ratio of average mobility to the standard deviation), respectively. The improvement in transistor electrical performance can be attributed to the combined effect of enhanced crystal orientation and uniformity, as well as increased areal coverage. This work can be applied beyond t...Continue Reading

References

Sep 20, 2001·Journal of the American Chemical Society·J E AnthonyS R Parkin
Dec 12, 2002·Journal of the American Chemical Society·Meidong LangAdam J Matzger
Apr 14, 2005·Journal of the American Chemical Society·Christopher P PriceAdam J Matzger
Aug 30, 2008·Journal of the American Chemical Society·Jihoon KangDo Y Yoon
Jan 4, 2019·Nature Communications·Jimin KwonSungjune Jung

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