期刊
NATURE NANOTECHNOLOGY
卷 12, 期 11, 页码 1077-+出版社
NATURE PORTFOLIO
DOI: 10.1038/NNANO.2017.155
关键词
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资金
- Office of Naval Research BRC Program
- US Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) [DE-SC0010409]
- Nanomachine Program [DE-AC02-05CH11231]
- DARPA
- National Science Foundation (NSF) [DMR-1508412]
- US DOE [DOE/DE-FG02-06ER46286]
- Welch Foundation [F-1837]
- Swiss National Science Foundation (SNSF) [P2ELP2-151852]
- US Army Research Laboratory
- US Army Research Office [W911NF-15-1-0237]
- Swiss National Science Foundation (SNF) [P2ELP2_151852] Funding Source: Swiss National Science Foundation (SNF)
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1508412] Funding Source: National Science Foundation
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.
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