Hong, Wenjing; Zhang, Hewei; Zhou, Ping; Daaoub, Abdul; Sangtarash, Sara; Zhao, Shiqiang; Yang, Zixian; Zhou, Yu; Zou, Yuling; Decurtins, Silvio; Häner, Robert; Yang, Yang; Sadeghi, Hatef; Liu, Shi-Xia (2023). Atomically Well-defined Nitrogen Doping in the Cross-plane Transport through Graphene Heterojunctions. Chemical Science, 14(22), pp. 6079-6086. The Royal Society of Chemistry 10.1039/D3SC00075C
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The nitrogen doping of graphene leads to graphene heterojunctions with a tunable bandgap, suitable for electronics, electrochemical, and sensing applications. However, the microscopic nature and charge transport properties of atomic-level nitrogen-doped graphene are still unknown, mainly due to the multiple doping sites with topological diversities. In this work, we fabricated the atomically well-defined N-doped graphene heterojunctions and investigated the cross-plane transport through these heterojunctions to reveal the effects of doping on their electronic properties. We found that different doping number of nitrogen atoms leads to a conductance difference of up to ~288, and the conductance of graphene heterojunctions with nitrogen-doping at different positions in the conjugated framework can also lead to a conductance difference of ~170. Combined ultraviolet photoelectron spectroscopy measurements and theoretical calculations reveal that the insertion of nitrogen atoms into the conjugation framework significantly stabilizes the frontier molecular orbitals, leading to a change in the relative positions of HOMO and LUMO to the Fermi level of the electrodes. Our work provides a unique insight into the role of nitrogen doping on the charge transport through graphene heterojunctions and materials at the single atomic level.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP) 08 Faculty of Science > Other Institutions > Emeriti, Faculty of Science |
UniBE Contributor: |
Zhou, Ping, Decurtins, Silvio, Häner, Robert, Liu, Shi-Xia |
Subjects: |
500 Science > 530 Physics 500 Science > 540 Chemistry |
ISSN: |
2041-6520 |
Publisher: |
The Royal Society of Chemistry |
Funders: |
[4] Swiss National Science Foundation ; [57] National Natural Science Foundation of China ; [UNSPECIFIED] the UKRI Future Leaders Fellowship ; [UNSPECIFIED] Natural Science Foundation of Fujian Province ; [UNSPECIFIED] the Leverhulme Trust Early Career Fellowship ; [UNSPECIFIED] the NCCR MUST ‘‘Molecular Ultrafast Science and Technology’’ |
Language: |
English |
Submitter: |
Shi-Xia Liu |
Date Deposited: |
12 May 2023 07:29 |
Last Modified: |
08 Jun 2023 00:15 |
Publisher DOI: |
10.1039/D3SC00075C |
BORIS DOI: |
10.48350/182499 |
URI: |
https://boris.unibe.ch/id/eprint/182499 |
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