期刊
JOURNAL OF PHYSICS D-APPLIED PHYSICS
卷 50, 期 8, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6463/aa5583
关键词
black phosphorus; phosphorene; nanoribbon; edge structure; transmission electron microscopy
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2014R1A1A2058178]
- Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning [NRF-2016M3D1A1900035]
- EPSRC-DTP
- EPSRC [EP/K013564/1]
- Extreme Science and Engineering Discovery Environment (XSEDE) - NSF [TG-DMR120049, TG-DMR150017]
- Queen's Fellow Award [M8407MPH]
- EPSRC [EP/K013459/1, EP/P022561/1, EP/K013564/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/K013459/1, EP/K013564/1, 1612621, EP/P022561/1] Funding Source: researchfish
- National Research Foundation of Korea [2016M3D1A1900035, 2014R1A1A2058178, 2015H1A2A1031319] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Black phosphorus (BP) has recently emerged as an alternative 2D semiconductor owing to its fascinating electronic properties such as tunable bandgap and high charge carrier mobility. The structural investigation of few-layer BP, such as identification of layer thickness and atomic-scale edge structure, is of great importance to fully understand its electronic and optical properties. Here we report atomic-scale analysis of few-layered BP performed by aberration corrected transmission electron microscopy (TEM). We establish the layer-number-dependent atomic resolution imaging of few-layer BP via TEM imaging and image simulations. The structural modification induced by the electron beam leads to revelation of crystalline edge and formation of BP nanoribbons. Atomic resolution imaging of BP clearly shows the reconstructed zigzag (ZZ) edge structures, which is also corroborated by van der Waals first principles calculations on the edge stability. Our study on the precise identification of BP thickness and atomic-resolution imaging of edge structures will lay the groundwork for investigation of few-layer BP, especially BP in nanostructured forms.
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