Exceptional electron conduction in two-dimensional covalent organic frameworks

Jin, E., Geng, K., Fu, S., Yang, S., Kanlayakan, N., Addicoat, M.A. ORCID: 0000-0002-5406-7927, Kungwan, N., Geurs, J., Xu, H., Bonn, M., Wang, H.I., Smet, J., Kowalczyk, T. and Jiang, D., 2021. Exceptional electron conduction in two-dimensional covalent organic frameworks. Chem, 7 (12), pp. 3309-3324. ISSN 2451-9294

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Abstract

Most organic/polymeric semiconductors are p-type semiconductors, whereas their n-type versions are limited in both availability and carrier mobility. How to develop high-rate n-type organic/polymeric semiconductors remains challenging. Here, we report an approach to high-rate n-type semiconductors via topology-directed polycondensation of conventional p-type knots with n-type isoindigo linkers to form non-conjugated tetragonal and hexagonal two-dimensional polymeric frameworks. The polymers are planar in conformation and show flattened frontier levels, which enable electrons to move along the non-conjugated polymeric backbones. The eclipsed face-to-face stack reduces reorganization energy and greatly strengthens electronic coupling, thus enabling band-like electron conduction perpendicular to polymer layers. A device recording electron mobility as high as 8.2 cm2 V−1 s−1 was achieved with Hall effect measurements, whereas time- and frequency-resolved terahertz spectroscopy revealed a benchmark mobility of 13.3 cm2 V−1 s−1. These new mechanistic insights with exceptional mobility open the way to high-rate n-type organic/polymeric semiconductors.

Item Type: Journal article
Publication Title: Chem
Creators: Jin, E., Geng, K., Fu, S., Yang, S., Kanlayakan, N., Addicoat, M.A., Kungwan, N., Geurs, J., Xu, H., Bonn, M., Wang, H.I., Smet, J., Kowalczyk, T. and Jiang, D.
Publisher: Elsevier BV
Date: 9 December 2021
Volume: 7
Number: 12
ISSN: 2451-9294
Identifiers:
NumberType
10.1016/j.chempr.2021.08.015DOI
1508600Other
Rights: © 2021 Elsevier Inc.
Divisions: Schools > School of Science and Technology
Record created by: Linda Sullivan
Date Added: 18 Jan 2022 16:34
Last Modified: 18 Jan 2022 16:34
URI: http://irep.ntu.ac.uk/id/eprint/45353

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