Two-dimensional (2D) materials such as transition metal chalcogenides can be used to create different components of electronic devices, including semiconducting channels and metallic electrodes and interconnects. However, devices are typically fabricated using a step-by-step process that can introduce defects and impurities, leading to a reduction in device performance. Here we show that 2D electronic components can be chemically synthesized and integrated simultaneously in a single step, creating 2D devices in which each component in the active layer is connected via covalent bonds instead of physical interfaces. The approach involves the phase-patterned growth of atomic layers, and, using 2D molybdenum ditelluride (MoTe2) as the active material, we show that it can be used to construct high-performance field-effect transistors (FETs) and arrays of logic devices. We also use the technique to construct FETs with ultrashort gate lengths, bilayered FETs with vertical interconnections and flexible devices.
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This work was supported by the National Science Foundation of China (grants nos. 21875127, 21573125, 51522212, 51421002, 51672307, 61574083 and 61434001), the Research Fund from Beijing Innovation Center for Future Chip, Beijing Municipal Science & Technology Commission (no. Z161100002116030), Tsinghua University Initiative Scientific Research Program, National Key R&D Program (grant no. 2016YFA0200400), the National Basic Research Program (grants nos. 2014CB921002 and 2015CB352101), the Independent Research Program of Tsinghua University (grant no. 2014Z01006), Shenzhen Science and Technology Program (grant no. JCYJ20150831192224146) and the Strategic Priority Research Program of the Chinese Academy of Science (grant no. XDB 07030200). The authors thank J. Zhang and S. Zhang for providing carbon nanotube array samples. The authors thank C. Li and H. Chen for performing tensile tests. The authors thank L. Zhou for the discussion on the growth of MoTe2.
Supplementary Methods 1–5, Supplementary Notes 1–4, Supplementary Tables 1–2 and Supplementary Figs. 1–20.
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Nature Electronics (2019)