Imperial College London
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ProfessorJohannesLischner

Faculty of Engineering, Department of Materials

Professor of Theory and Simulation of Materials
 
 
 
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Contact

 

+44 (0)20 7594 9949j.lischner

 
 
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Location

 

342Bessemer BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Liou:2021:10.1021/acs.nanolett.1c03039,
author = {Liou, F and Tsai, H-Z and Aikawa, AS and Natividad, KC and Tang, E and Ha, E and Riss, A and Watanabe, K and Taniguchi, T and Lischner, J and Zettl, A and Crommie, MF},
doi = {10.1021/acs.nanolett.1c03039},
journal = {Nano Letters: a journal dedicated to nanoscience and nanotechnology},
pages = {8770--8776},
title = {Imaging reconfigurable molecular concentration on a graphene field-effect transistor},
url = {http://dx.doi.org/10.1021/acs.nanolett.1c03039},
volume = {21},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The spatial arrangement of adsorbates deposited onto a clean surface under vacuum typically cannot be reversibly tuned. Here we use scanning tunneling microscopy to demonstrate that molecules deposited onto graphene field-effect transistors (FETs) exhibit reversible, electrically tunable surface concentration. Continuous gate-tunable control over the surface concentration of charged F4TCNQ molecules was achieved on a graphene FET at T = 4.5K. This capability enables the precisely controlled impurity doping of graphene devices and also provides a new method for determining molecular energy level alignment based on the gate-dependence of molecular concentration. Gate-tunable molecular concentration is explained by a dynamical molecular rearrangement process that reduces total electronic energy by maintaining Fermi level pinning in the device substrate. The molecular surface concentration is fully determined by the device back-gate voltage, its geometric capacitance, and the energy difference between the graphene Dirac point and the molecular LUMO level.
AU  - Liou,F
AU  - Tsai,H-Z
AU  - Aikawa,AS
AU  - Natividad,KC
AU  - Tang,E
AU  - Ha,E
AU  - Riss,A
AU  - Watanabe,K
AU  - Taniguchi,T
AU  - Lischner,J
AU  - Zettl,A
AU  - Crommie,MF
DO  - 10.1021/acs.nanolett.1c03039
EP  - 8776
PY  - 2021///
SN  - 1530-6984
SP  - 8770
TI  - Imaging reconfigurable molecular concentration on a graphene field-effect transistor
T2  - Nano Letters: a journal dedicated to nanoscience and nanotechnology
UR  - http://dx.doi.org/10.1021/acs.nanolett.1c03039
UR  - https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000713060900032&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://pubs.acs.org/doi/10.1021/acs.nanolett.1c03039
VL  - 21
ER  -
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