Unified film patterning and annealing of an organic semiconductor with micro-grooved wet stamps

Kyunghun Kim, Mi Jang, Minjung Lee, Tae Kyu An, John E. Anthony, Se Hyun Kim, Hoichang Yang, Chan Eon Park

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

A unified patterning and annealing approach was successfully demonstrated for 5,11-bis(triethylsilylethynyl)-anthradithiophene (TES-ADT) films spun-cast on polymer-treated SiO2 dielectrics. First, rubbery polydimethylsiloxane (μ-PDMS) stamps with microscale periodic grooves were swollen in 1,2-dichloroethane and then softly placed onto amorphous-like TES-ADT films. In this case, the film sides physically in contact with the wet stamps were quickly absorbed into the PDMS matrix while the non-contact area formed highly-ordered phases by the solvent-annealing effect. The resulting patterns of TES-ADT contained discernable crystallites, where the grain sizes drastically decreased and their shapes transformed from spherulites to optically featureless ones with a decreasing line width from 100 to 2.5 μm. Unlike ordinary systems containing spherulitic domains, the 2.5 μm line-confined TES-ADT patterns contained layer-stacked crystallites but an optically invisible grain boundary, yielding an unexpectedly high field-effect mobility of 2.60 cm2 V-1 s-1 in organic field-effect transistors (OFETs), with narrow deviations less than 8% (averaged from 42 devices). The results suggest that the well π-overlapped grains and their smooth connections are key factors to achieve high performance multi-array OFET applications.

Original languageEnglish
Pages (from-to)6996-7003
Number of pages8
JournalJournal of Materials Chemistry C
Volume4
Issue number29
DOIs
StatePublished - 2016

Bibliographical note

Publisher Copyright:
© 2016 The Royal Society of Chemistry.

Copyright:
Copyright 2016 Elsevier B.V., All rights reserved.

ASJC Scopus subject areas

  • Chemistry (all)
  • Materials Chemistry

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