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Updated: Feb 2, 2026

Reactive Vapor Deposition of Conjugated Polymer Films on Arbitrary Substrates
Published on: January 17, 2018
Fast Deposition of Aligning Edge-On Polymers for High-Mobility Ambipolar Transistors
Yingying Jiang1,2, Jinyang Chen1,2, Yunlong Sun1,2
1Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry Chinese Academy of Sciences, Beijing, 100190, P. R. China.
Abstract:
Fast deposition of aligning ambipolar polymers for high-performance organic field-effect transistors (OFETs) and inverter circuits are highly desired for both scientific studies and industry applications. Here, large-area and ordered polymer films are prepared by a bar-coating method at a rate of 120 mm s-1 in air. Atomic force microscopy and grazing-incidence wide-angle X-ray scattering analysis indicate uniform edge-on poly(fluoroisoindigo-difluorobithiophene-fluoroisoindigo-bithiophene) (PFIBI-BT) in 11.7 ± 1 nm film (≈5 layers). The elongated, uniformly oriented grains can reduce the adverse effects of the grain boundaries and facilitate charge transport in polymers. Furthermore, OFETs based on parallel film show high hole/electron mobilities up to 5.5/4.5 cm2 V-1 s-1 , which are approximately nine times of the devices prepared by spin-coating. The gain of the inverter is as high as 174, which is one of the highest values in polymer inventers currently. These results demonstrate that the excellent bipolar performance of few-layer PFIBI-BT can be ensured while achieving the compatibility of the experimental process with industrial preparation.
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