Rhenium disulfide (ReS2) has been attracting attentions due to the direct bandgap regardless of the thickness and anisotropic electrical, mechanical and optical properties deriving from its unique crystal lattice structure. In order to utilize these properties, some synthesis methods of ReS2 have been studied for electronic applications. However, their results are not suitable for practical applications because of non-uniformity, discontinuity and difficulty of large-area continuous film growth. Here, we report the synthesis method of layer-controlled wafer-scale (7 × 2 cm2) ReS2 films by chemical vapor deposition with high uniformity and continuity. Especially, we demonstrate successfully a direct synthesis of ReS2 on a transparent flexible glass substrate at low synthesis temperature (450 °C) without the aid of a catalyst or a plasma enhanced system. The field effect transistors with asgrown ReS2 films on the flexible glass exhibit typical n-type behavior with low threshold voltage of 0.75 V, high on-off ratio of 105, low subthreshold swing of 260 mV/decade and mobility of 0.13 cm2 V-1 S-1. The direct synthesis of ReS2 films on flexible glass will provide the platform to realize large area transfer-free fabrication of high quality transparent flexible electronic devices.
Bibliographical noteFunding Information:
This study was supported by an Institute for Information & Communications Technology Promotion (IITP) grant (B0117-16-1003, Fundamental technologies of 2D materials and devices for the platform of new-functional smart devices), the Basic Science Research Program (2016R1A2B4012931) and the Global Frontier Research Center for Advanced Soft Electronics (2011-0031630) through a National Research Foundation of Korea grant funded by the Korean government Ministry of Science, ICT and Future Planning.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering