Aggregation control in natural brush-printed conjugated polymer films and implications for enhancing charge transport.

Autor: Wang G; Department of Chemistry, Northwestern University, Evanston, IL 60208.; The Materials Research Center, Northwestern University, Evanston, IL 60208.; The Argonne-Northwestern Solar Energy Research Center, Northwestern University, Evanston, IL 60208., Huang W; Department of Chemistry, Northwestern University, Evanston, IL 60208.; The Materials Research Center, Northwestern University, Evanston, IL 60208.; The Argonne-Northwestern Solar Energy Research Center, Northwestern University, Evanston, IL 60208., Eastham ND; Department of Chemistry, Northwestern University, Evanston, IL 60208.; The Materials Research Center, Northwestern University, Evanston, IL 60208.; The Argonne-Northwestern Solar Energy Research Center, Northwestern University, Evanston, IL 60208., Fabiano S; Department of Chemistry, Northwestern University, Evanston, IL 60208.; Flexterra, Inc., Skokie, IL 60077.; Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, Norrköping SE-60174, Sweden., Manley EF; Department of Chemistry, Northwestern University, Evanston, IL 60208.; Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL 60439., Zeng L; Graduate Program in Applied Physics, Materials Research Center, Northwestern University, Evanston, IL 60208., Wang B; Department of Chemistry, Northwestern University, Evanston, IL 60208.; The Materials Research Center, Northwestern University, Evanston, IL 60208.; The Argonne-Northwestern Solar Energy Research Center, Northwestern University, Evanston, IL 60208., Zhang X; Department of Chemistry, Northwestern University, Evanston, IL 60208.; The Materials Research Center, Northwestern University, Evanston, IL 60208.; The Argonne-Northwestern Solar Energy Research Center, Northwestern University, Evanston, IL 60208., Chen Z; Flexterra, Inc., Skokie, IL 60077., Li R; The Materials Research Center, Northwestern University, Evanston, IL 60208.; The Argonne-Northwestern Solar Energy Research Center, Northwestern University, Evanston, IL 60208.; Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208., Chang RPH; The Materials Research Center, Northwestern University, Evanston, IL 60208.; The Argonne-Northwestern Solar Energy Research Center, Northwestern University, Evanston, IL 60208.; Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208., Chen LX; Department of Chemistry, Northwestern University, Evanston, IL 60208.; The Materials Research Center, Northwestern University, Evanston, IL 60208.; The Argonne-Northwestern Solar Energy Research Center, Northwestern University, Evanston, IL 60208.; Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL 60439., Bedzyk MJ; The Materials Research Center, Northwestern University, Evanston, IL 60208.; The Argonne-Northwestern Solar Energy Research Center, Northwestern University, Evanston, IL 60208.; Graduate Program in Applied Physics, Materials Research Center, Northwestern University, Evanston, IL 60208.; Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208., Melkonyan FS; Department of Chemistry, Northwestern University, Evanston, IL 60208.; The Materials Research Center, Northwestern University, Evanston, IL 60208.; The Argonne-Northwestern Solar Energy Research Center, Northwestern University, Evanston, IL 60208., Facchetti A; Department of Chemistry, Northwestern University, Evanston, IL 60208; a-facchetti@northwestern.edu t-marks@northwestern.edu.; The Materials Research Center, Northwestern University, Evanston, IL 60208.; The Argonne-Northwestern Solar Energy Research Center, Northwestern University, Evanston, IL 60208.; Flexterra, Inc., Skokie, IL 60077., Marks TJ; Department of Chemistry, Northwestern University, Evanston, IL 60208; a-facchetti@northwestern.edu t-marks@northwestern.edu.; The Materials Research Center, Northwestern University, Evanston, IL 60208.; The Argonne-Northwestern Solar Energy Research Center, Northwestern University, Evanston, IL 60208.; Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208.
Jazyk: angličtina
Zdroj: Proceedings of the National Academy of Sciences of the United States of America [Proc Natl Acad Sci U S A] 2017 Nov 21; Vol. 114 (47), pp. E10066-E10073. Date of Electronic Publication: 2017 Nov 06.
DOI: 10.1073/pnas.1713634114
Abstrakt: Shear-printing is a promising processing technique in organic electronics for microstructure/charge transport modification and large-area film fabrication. Nevertheless, the mechanism by which shear-printing can enhance charge transport is not well-understood. In this study, a printing method using natural brushes is adopted as an informative tool to realize direct aggregation control of conjugated polymers and to investigate the interplay between printing parameters, macromolecule backbone alignment and aggregation, and charge transport anisotropy in a conjugated polymer series differing in architecture and electronic structure. This series includes ( i ) semicrystalline hole-transporting P3HT, ( ii ) semicrystalline electron-transporting N2200, ( iii ) low-crystallinity hole-transporting PBDTT-FTTE, and ( iv ) low-crystallinity conducting PEDOT:PSS. The (semi-)conducting films are characterized by a battery of morphology and microstructure analysis techniques and by charge transport measurements. We report that remarkably enhanced mobilities/conductivities, as high as 5.7×/3.9×, are achieved by controlled growth of nanofibril aggregates and by backbone alignment, with the adjusted R 2 ( R 2 adj ) correlation between aggregation and charge transport as high as 95%. However, while shear-induced aggregation is important for enhancing charge transport, backbone alignment alone does not guarantee charge transport anisotropy. The correlations between efficient charge transport and aggregation are clearly shown, while mobility and degree of orientation are not always well-correlated. These observations provide insights into macroscopic charge transport mechanisms in conjugated polymers and suggest guidelines for optimization.
Competing Interests: The authors declare no conflict of interest.
Databáze: MEDLINE
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