High-Mobility Naphthalene Diimide and Selenophene-Vinylene-Selenophene-Based Conjugated Polymer: n-Channel Organic Field-Effect Transistors and Structure–Property Relationship

Min Jae Sung, Alessandro Luzio, Won Tae Park, Ran Kim, Eliot Gann, Francesco Maddalena, Giuseppina Pace, Yong Xu, Dario Natali, Carlo de Falco, Long Dang, Christopher R. McNeill, Mario Caironi, Yong Young Noh, Yun Hi Kim

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73 Citations (Scopus)

Abstract

Interdependence of chemical structure, thin-film morphology, and transport properties is a key, yet often elusive aspect characterizing the design and development of high-mobility, solution-processed polymers for large-area and flexible electronics applications. There is a specific need to achieve >1 cm2 V−1 s−1 field-effect mobilities (μ) at low processing temperatures in combination with environmental stability, especially in the case of electron-transporting polymers, which are still lagging behind hole transporting materials. Here, the synthesis of a naphthalene-diimide based donor–acceptor copolymer characterized by a selenophene vinylene selenophene donor moiety is reported. Optimized field-effect transistors show maximum μ of 2.4 cm2 V−1 s−1 and promising ambient stability. A very marked film structural evolution is revealed with increasing annealing temperature, with evidence of a remarkable 3D crystallinity above 180 °C. Conversely, transport properties are found to be substantially optimized at 150 °C, with limited gain at higher temperature. This discrepancy is rationalized by the presence of a surface-segregated prevalently edge-on packed polymer phase, dominating the device accumulated channel. This study therefore serves the purpose of presenting a promising, high-electron-mobility copolymer that is processable at relatively low temperatures, and of clearly highlighting the necessity of specifically investigating channel morphology in assessing the structure–property nexus in semiconducting polymer thin films.

Original languageEnglish
Pages (from-to)4984-4997
Number of pages14
JournalAdvanced Functional Materials
Volume26
Issue number27
DOIs
Publication statusPublished - 19 Jul 2016

Keywords

  • functional morphology
  • n-type organic transistor
  • naphthalene diimide
  • selenophene vinylene selenophene
  • structure–property relationship

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