期刊
NATURE NANOTECHNOLOGY
卷 9, 期 11, 页码 896-900出版社
NATURE PORTFOLIO
DOI: 10.1038/NNANO.2014.184
关键词
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资金
- Swiss National Science Foundation
- State Secretariat for Education, Research and Innovation via the COST Action [MP0901]
- European Science Foundation under the EUROCORES Program EuroGRAPHENE (GOSPEL), ERC NANOGRAPH, EU GENIUS project, Graphene Flagship
- Office of Naval Research BRC Program
- Swiss Supercomputing Center, CSCS [s507]
Despite graphene's remarkable electronic properties(1,2), the lack of an electronic bandgap severely limits its potential for applications in digital electronics(3,4). In contrast to extended films, narrow strips of graphene (called graphene nanoribbons) are semiconductors through quantum confinement(5,6), with a bandgap that can be tuned as a function of the nanoribbon width and edge structure(7-10). Atomically precise graphene nanoribbons can be obtained via a bottom-up approach based on the surface-assisted assembly of molecular precursors(11). Here we report the fabrication of graphene nanoribbon heterojunctions and heterostructures by combining pristine hydrocarbon precursors with their nitrogen-substituted equivalents. Using scanning probe methods, we show that the resulting heterostructures consist of seamlessly assembled segments of pristine (undoped) graphene nanoribbons (p-GNRs) and deterministically nitrogen-doped graphene nanoribbons (N-GNRs), and behave similarly to traditional p-n junctions(12). With a band shift of 0.5 eV and an electric field of 2 x 10(8) V m(-1) at the heterojunction, these materials bear a high potential for applications in photovoltaics and electronics.
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