Direct Epitaxial Synthesis of Selective Two-Dimensional Lateral Heterostructures
| Autor: | Hu Young Jeong, Young-Woo Lee, Youngsin Park, Stephen M. Morris, Jung Inn Sohn, Sanghyo Lee, Bo Hou, Hyeon Suk Shin, Sangyeon Pak, A-Rang Jang, SeungNam Cha, John Hong, Yuljae Cho, Jong Min Kim, Juwon Lee |
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| Rok vydání: | 2019 |
| Předmět: |
Fabrication
Materials science business.industry Alloy General Engineering General Physics and Astronomy Heterojunction 02 engineering and technology Chemical vapor deposition engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Epitaxy 01 natural sciences 0104 chemical sciences Crystal Monolayer engineering Deposition (phase transition) Optoelectronics General Materials Science 0210 nano-technology business |
| Zdroj: | ACS Nano. 13:13047-13055 |
| ISSN: | 1936-086X 1936-0851 |
| Popis: | Two-dimensional (2D) heterostructured or alloyed monolayers composed of transition metal dichalcogenides (TMDCs) have recently emerged as promising materials with great potential for atomically thin electronic applications. However, fabrication of such artificial TMDC heterostructures with a sharp interface and a large crystal size still remains a challenge because of the difficulty in controlling various growth parameters simultaneously during the growth process. Here, a facile synthetic protocol designed for the production of the lateral TMDC heterostructured and alloyed monolayers is presented. A chemical vapor deposition approach combined with solution-processed precursor deposition makes it possible to accurately control the sequential introduction time and the supersaturation levels of the vaporized precursors and thus reliably and exclusively produces selective and heterogeneous epitaxial growth of TMDC monolayer crystals. In addition, TMDC core/shell heterostructured (MoS2/alloy, alloy/WS2) or alloyed (Mo1-xWxS2) monolayers are also easily obtained with precisely controlled growth parameters, such as sulfur introduction timing and growth temperature. These results represent a significant step toward the development of various 2D materials with interesting properties. |
| Databáze: | OpenAIRE |
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