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Using Deposition Rate to Control Liquid Crystal-like Order in Vapor Deposited Organic Glasses

ORAL

Abstract

Physical vapor deposition can prepare glassy materials with high degrees of structural anisotropy compared to liquid-cooled glasses. In this work, Posaconazole, a molecule with no known liquid crystal phases, is vapor-deposited to create smectic-like glasses with a high degree of orientational and positional order [Bishop et. al. PNAS 116, 21421 (2019)]. Deposition parameters are varied to prepare glasses with a range of liquid crystal-like order. We show that increasing the substrate temperature and decreasing the deposition rate have the same effect upon vapor-deposited glass structure, and describe the relationship using a “Deposition Rate-Substrate Temperature Superposition”. We expect that this superposition principle can be used to understand surface dynamics during vapor deposition, in order to optimize structural order in glasses for organic electronic applications.

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Presenters

  • Camille Bishop

    Chemistry, University of Wisconsin - Madison, University of Wisconsin - Madison, Department of Chemistry, University of Wisconsin-Madison

Authors

  • Camille Bishop

    Chemistry, University of Wisconsin - Madison, University of Wisconsin - Madison, Department of Chemistry, University of Wisconsin-Madison

  • Jacob Thelen

    National Institute of Standards and Technology

  • Yuhui Li

    University of Wisconsin - Madison

  • Eliot H Gann

    National Institute of Standards and Technology

  • Michael Toney

    SLAC - Natl Accelerator Lab, SLAC National Accelerator Laboratory, SLAC Linear Accelerator Laboratory, Stanford Linear Accelerator Laboratory

  • Lian Yu

    University of Wisconsin - Madison

  • Dean DeLongchamp

    National Institute of Standards and Technology

  • Mark Ediger

    University of Wisconsin - Madison, Chemistry, University of Wisconsin - Madison, Department of Chemistry, University of Wisconsin-Madison