Revealing the Local Electronic Structure of a Single-Layer Covalent Organic Framework through Electronic Decoupling
Publication Date
Winter 1-7-2020
Description
Covalent organic frameworks (COFs) are molecule-based 2D and 3D materials that possess a wide range of mechanical and electronic properties. We have performed a joint experimental and theoretical study of the electronic structure of boroxine-linked COFs grown under ultrahigh vacuum conditions and characterized using scanning tunneling spectroscopy on Au(111) and hBN/Cu(111) substrates. Our results show that a single hBN layer electronically decouples the COF from the metallic substrate, thus suppressing substrate-induced broadening and revealing new features in the COF electronic local density of states (LDOS). The resulting sharpening of LDOS features allows us to experimentally determine the COF band gap, bandwidths, and the electronic hopping amplitude between adjacent COF bridge sites. These experimental parameters are consistent with the results of first-principles theoretical predictions.
Journal
Nano Letters
Volume
20
Issue
2
First Page
963
Last Page
970
Department
Chemistry
Link to Published Version
https://pubs.acs.org/doi/10.1021/acs.nanolett.9b03998
DOI
doi.org/10.1021/acs.nanolett.9b03998
Recommended Citation
Rizzo, Daniel; Dai, Qingqing; Bronner, Christopher; Veber, Gregory; Smith, Brian J.; Matsumoto, Michio; Thomas, Simil; Nguyen, Giang; Forrester, Patrick; Zhao, William; Jørgensen, Jakob; Dichtel, William; Fischer, Felix; Li, Hong; Bredas, Jean-Luc; and Crommie, Michael. "Revealing the Local Electronic Structure of a Single-Layer Covalent Organic Framework through Electronic Decoupling." (2020) : 963-970.