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Open Access Molecular Strategies for Morphology Control in Semiconducting Polymers for Optoelectronics

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Solution-processable semiconducting polymers have been explored over the last decades for their potential applications in inexpensively fabricated transistors, diodes and photovoltaic cells. However, a remaining challenge in the field is to control the solid-state self-assembly of polymer chains in thin films devices, as the aspects of (semi)crystallinity, grain boundaries, and chain entanglement can drastically affect intra-and inter-molecular charge transport/transfer and thus device performance. In this short review we examine how the aspects of molecular weight and chain rigidity affect solid-state self-assembly and highlight molecular engineering strategies to tune thin film morphology. Side chain engineering, flexibly linking conjugation segments, and block co-polymer strategies are specifically discussed with respect to their effect on field effect charge carrier mobility in transistors and power conversion efficiency in solar cells. Example systems are taken from recent literature including work from our laboratories to illustrate the potential of molecular engineering semiconducting polymers.
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Keywords: CONJUGATED POLYMERS; PHOTOVOLTAICS; SEMICRYSTALLINE; SOLUTION-PROCESSING; TRANSISTORS

Document Type: Research Article

Affiliations: 1: Ecole Polytechnique Fédérale de Lausanne (EPFL) Institut des Sciences et Ingénierie Chimiques Laboratory for Molecular Engineering of Optoelectronic Nanomaterials (LIMNO) EPFL SB ISIC LIMNO, Station 6 CH-1015 Lausanne 2: Ecole Polytechnique Fédérale de Lausanne (EPFL) Institut des Sciences et Ingénierie Chimiques Laboratory for Molecular Engineering of Optoelectronic Nanomaterials (LIMNO) EPFL SB ISIC LIMNO, Station 6 CH-1015 Lausanne;, Email: [email protected]

Publication date: June 1, 2017

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  • International Journal for Chemistry and Official Membership Journal of the Swiss Chemical Society (SCS) and its Divisions

    CHIMIA, a scientific journal for chemistry in the broadest sense, is published 10 times a year and covers the interests of a wide and diverse readership. Contributions from all fields of chemistry and related areas are considered for publication in the form of Review Articles and Notes. A characteristic feature of CHIMIA are the thematic issues, each devoted to an area of great current significance.

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