A general ink formulation of 2D crystals for wafer-scale inkjet printing

Guohua Hu, Lisong Yang, Zongyin Yang, Yubo Wang, Xinxin Jin, Jie Dai, Qing Wu, Shouhu Liu, Xiaoxi Zhu, Xiaoshan Wang, Tien Chun Wu, Richard C.T. Howe, Tom Albrow-Owen, Leonard W.T. Ng, Qing Yang, Luigi G. Occhipinti, Robert I. Woodward, Edmund J.R. Kelleher, Zhipei Sun, Xiao HuangMeng Zhang*, Colin D. Bain, Tawfique Hasan

*Corresponding author for this work

    Research output: Contribution to journalJournal articleResearchpeer-review

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    Recent advances in inkjet printing of two-dimensional (2D) crystals show great promise for next-generation printed electronics development. Printing nonuniformity, however, results in poor reproducibility in device performance and remains a major impediment to their large-scale manufacturing. At the heart of this challenge lies the coffee-ring effect (CRE), ring-shaped nonuniform deposits formed during postdeposition drying. We present an experimental study of the drying mechanism of a binary solvent ink formulation. We show that Marangoni-enhanced spreading in this formulation inhibits contact line pinning and deforms the droplet shape to naturally suppress the capillary flows that give rise to the CRE. This general formulation supports uniform deposition of 2D crystals and their derivatives, enabling scalable and even wafer-scale device fabrication, moving them closer to industrial-level additive manufacturing.

    Original languageEnglish
    Article numbereaba5029
    JournalScience Advances
    Issue number33
    Number of pages6
    Publication statusPublished - Aug 2020


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