Demonstrating Band Design in Two-Dimensional Covalent Organic Frameworks

ORAL

Abstract

Two dimensional covalent organic frameworks (COFs) are periodic lattices whose rational design can yield novel optoelectronic properties and new heterostructure devices. Analogous to graphene and the inorganic family of 2D materials, 2D COFs are covalently bonded in-plane with out-of-plane bonding through Van der Waals interactions. To date, 2D COF properties are limited by large molecular bandgaps, low intermolecular coupling, and poor control of the material morphology. Here, we report the rational design and characterization of a new, highly conjugated, semiconducting 2D framework. We characterize the structure by X-ray scattering, TEM, and AFM, and demonstrate facile manipulation onto arbitrary experimental platforms. We further employ broadband optical and vibrational spectroscopies to observe electronic behavior emergent in this highly conjugated system.

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Presenters

  • Halleh Balch

    University of California - Berkeley, Physics, University of California, Berkeley

Authors

  • Halleh Balch

    University of California - Berkeley, Physics, University of California, Berkeley

  • Austin Evans

    Northwestern University, Chemistry, Northwestern University

  • Raghunath Dasari

    Georgia Institute of Technology, Chemistry, Georgia Tech

  • Simil Thomas

    Chemistry, Georgia Tech

  • Kaitlin Slicker

    Chemistry, Georgia Tech

  • Hong Li

    Chemistry, Georgia Tech

  • Ruofan Li

    Cornell University, Physics, Cornell University

  • Dan Ralph

    Cornell University, Department of Physics, Cornell University, Physics, Cornell University

  • Jean-Luc E Bredas

    Chemistry, Georgia Tech

  • Seth R. Marder

    Georgia Institute of Technology, Chemistry, Georgia Institute of Technology, Chemistry, Georgia Tech

  • William Dichtel

    Northwestern University, Chemistry, Northwestern University

  • Feng Wang

    University of California - Berkeley, University of California, Berkeley, Physics, UC Berkeley, Department of Physics, University of California at Berkeley, Berkeley, CA 94709, USA, University of California at Berkeley, Lawrence Berkeley National Laboratory and UC Berkeley, UC Berkeley, Physics, University of California, Berkeley