Gas Blow Coating: a Deposition Technique to Control the Crystal Morphology in Thin Films of Organic Semiconductors

Jincheng Tong, Amadou Doumbia, Adriana Alieva, Michael Turner, Cinzia Casiraghi

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Rapid, large-scale, and low-cost coating methods that enable precise control of the crystal growth of organic semiconductors are essential to deliver high performance devices that are robust and reproducible. In this work, a novel method is presented, based on a gas blow coating technique, enabling the deposition of thin films of organic semiconductors, whose morphology can be optimized by adjusting the deposition parameters. We demonstrate the deposition of aligned single crystals of 6,13-bis(triisopropylsilylethynyl)pentacene (TIPS-Pentacene) and 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene (C8-BTBT) by gas blow coating and their use as active layers in organic field-effect transistor (OFET) devices. The OFETs of TIPS-Pentacene and C8-BTBT have charge mobilities of 0.15 and 1.4 cm2 V-1 s-1, respectively, with low threshold voltages and on/off ratios exceeding 105. This coating method can also be extended to polymeric semiconductors: films based on poly(3-hexylthiophene) (P3HT) and poly[2,5-(2-octyldodecyl)-3,6-diketopyrrolopyrrole-alt-5,5-(2,5-di(thien-2-yl)thieno [3,2-b]thiophene)] (DPPTTT) are realized, establishing gas blow coating as a novel and efficient technique for the deposition of thin films of organic semiconductors.
    Original languageEnglish
    JournalACS Omega
    DOIs
    Publication statusAccepted/In press - 3 May 2019

    Keywords

    • Gas blow coating
    • organic crystals
    • thin films
    • organic field-effect transistor

    Research Beacons, Institutes and Platforms

    • National Graphene Institute

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