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Non-Conjugated Flexible Linkers in Semiconducting Polymers: A Pathway to Improved Processability without Compromising Device Performance

Schroeder, BC; Chiu, Y-C; Gu, X; Zhou, Y; Xu, J; Lopez, J; Lu, C; ... Bao, Z; + view all (2016) Non-Conjugated Flexible Linkers in Semiconducting Polymers: A Pathway to Improved Processability without Compromising Device Performance. Advanced Electronic Materials , 2 (7) , Article 1600104. 10.1002/aelm.201600104. Green open access

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Abstract

Semiconducting polymers, in contrast to inorganic silicon, are solution processable and can potentially be printed cost efficiently on flexible large‐area substrates. However to do so it is of paramount importance to formulate the polymeric semiconductors into inks with specific viscosities. Herein, the synthesis of a new highly soluble isoindigo monomer and its incorporation into low bandgap semiconducting polymers is presented. Non‐conjugated flexible linkers are introduced into the conjugated backbone in order to modulate the materials processability. The viscoelastic properties of the new polymers are studied in detail by means of rheometry and dynamical mechanical analysis. The solution viscosity is directly proportional to the content of non‐conjugated linkers in the polymer backbone. In organic field‐effect transistors maximum hole mobilities of 1.7 cm2 V−1 s−1 are achieved with the new polymers. Due to the enhanced solubility all‐polymer solar cells are fabricated by solution shearing, reaching power conversion efficiency values of 3.7%.

Type: Article
Title: Non-Conjugated Flexible Linkers in Semiconducting Polymers: A Pathway to Improved Processability without Compromising Device Performance
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/aelm.201600104
Publisher version: https://doi.org/10.1002/aelm.201600104
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Technology, Physical Sciences, Nanoscience & Nanotechnology, Materials Science, Multidisciplinary, Physics, Applied, Science & Technology - Other Topics, Materials Science, Physics, Field-Effect Transistors, Heterojunction Solar-Cells, Charge-Carrier Mobility, Thin-Film Transistors, Conjugated Polymers, Glass-Transition, Molecular Packing, Isoindigo, Stability, Impact
URI: http://discovery.ucl.ac.uk/id/eprint/10048341
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