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Jin, E, Geng, K, Fu, S, Yang, S, Kanlayakan, N, Addicoat, MA 
ORCID: https://orcid.org/0000-0002-5406-7927, Kungwan, N, Geurs, J, Xu, H, Bonn, M, Wang, HI, 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: | Number Type 10.1016/j.chempr.2021.08.015 DOI 1508600 Other |
| 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: | 09 Sep 2022 03:00 |
| URI: | https://irep.ntu.ac.uk/id/eprint/45353 |
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