Understanding the Fabrication of Monolayer Organic Field-Effect Transistors (OFETs)
Mr. Guo Yifan
PhD candidate in the Mechanical Engineering Dept.
Date & Time
Tuesday, 26 April 2022
Organic field-effect transistors (OFETs) have shown great progress in next-generation flexible electronics. Meniscus-guided coating (MGC) can fabricate high-quality monolayer-semiconductor film, which can avoid thickness limits and achieve good charge transport property. However, the thermal energy from traditional metal deposition would penetrate the active layer and disorder the molecular packing. The reported probe-transferred gold electrodes cannot be applied for large-area fabrication, which limits the potential of commercialization and mass production. Mxene (Ti3C2Tx), a two-dimensional transition metal carbides and nitrides, have high conductivity and compatibility of large-area deposition without inducting thermal damage like the conventional electrode deposition method. Besides, the structure of 2D material allows better interface and closer contact between the electrode and the ultra-flat semiconductor layer. Compared with spray-coating and spin-coating, filtrated Mxene has high package density and strong oxidation resistance, thereby improving electrical performance and stability of the transistors. In this study, we utilized filtration to make high-resolution Mxene-electrodes (15 µm channel), and our devices achieved a current density of IDS/W~1.2 µA/µm under -80 V VG. Overall, we fabricated the Mxene-based large-area monolayer OFETs array, which demonstrates the potential of filtrated low-dimensional electrodes for monolayer organic semiconductors.