Atomically precise graphene nanoribbon heterojunctions from a single molecular precursor

The rational bottom-up synthesis of atomically defined graphene nanoribbon (GNR) heterojunctions represents an enabling technology for the design of nanoscale electronic devices. Synthetic strategies used thus far have relied on the random copolymerization of two electronically distinct molecular pr...

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Bibliographic Details
Published in:Nature nanotechnology Vol. 12; no. 11; pp. 1077 - 1082
Main Authors: Nguyen, Giang D., Tsai, Hsin-Zon, Omrani, Arash A., Marangoni, Tomas, Wu, Meng, Rizzo, Daniel J., Rodgers, Griffin F., Cloke, Ryan R., Durr, Rebecca A., Sakai, Yuki, Liou, Franklin, Aikawa, Andrew S., Chelikowsky, James R., Louie, Steven G., Fischer, Felix R., Crommie, Michael F.
Format: Journal Article
Language:English
Published: London Nature Publishing Group UK 01.11.2017
Nature Publishing Group
Subjects:
147/138
147/3
639/301/357/995
639/925/357/918/1052
Carbonyl compounds
Carbonyl groups
Carbonyls
Chemical synthesis
Copolymerization
Electronic devices
Electronic equipment
electronic properties and devices
electronic properties and materials
Fabrication
Graphene
Heterojunctions
Materials Science
Nanoribbons
NANOSCIENCE AND NANOTECHNOLOGY
Nanotechnology
Nanotechnology and Microengineering
Precursors
Realignment
Scanning tunneling microscopy
Spectroscopy
ISSN:1748-3387, 1748-3395, 1748-3395
Online Access:Get full text
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Summary:The rational bottom-up synthesis of atomically defined graphene nanoribbon (GNR) heterojunctions represents an enabling technology for the design of nanoscale electronic devices. Synthetic strategies used thus far have relied on the random copolymerization of two electronically distinct molecular precursors to yield GNR heterojunctions. Here we report the fabrication and electronic characterization of atomically precise GNR heterojunctions prepared through late-stage functionalization of chevron GNRs obtained from a single precursor. Post-growth excitation of fully cyclized GNRs induces cleavage of sacrificial carbonyl groups, resulting in atomically well-defined heterojunctions within a single GNR. The GNR heterojunction structure was characterized using bond-resolved scanning tunnelling microscopy, which enables chemical bond imaging at T  = 4.5 K. Scanning tunnelling spectroscopy reveals that band alignment across the heterojunction interface yields a type II heterojunction, in agreement with first-principles calculations. GNR heterojunction band realignment proceeds over a distance less than 1 nm, leading to extremely large effective fields. Bottom-up fabrication of GNR heterojunctions exhibiting atomically perfect heterojunction interfaces can be obtained from a single molecular precursor via post-growth modification
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USDOE Office of Science (SC), Basic Energy Sciences (BES)
US Department of the Navy, Office of Naval Research (ONR)
US Army Research Laboratory (USARL)
Army Research Office (ARO)
Swiss National Science Foundation (SNSF)
National Science Foundation (NSF)
Defense Advanced Research Projects Agency (DARPA)
Welch Foundation
AC02-05CH11231; SC0010409; FG02-06ER46286; W911NF-15-1-0237; DMR-1508412; F-1837; P2ELP2-151852
ISSN:1748-3387
1748-3395
1748-3395
DOI:10.1038/nnano.2017.155