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.

*Army Research Office grant number W911NF-15-1-0447

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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