What's Happening?
Researchers from imec, TSMC, and ASML have successfully utilized extreme ultraviolet (EUV) lithography to pattern transition metal dichalcogenides (TMDs) such as molybdenum disulfide (MoS2), tungsten disulfide (WS2), and tungsten diselenide (WSe2). These
materials are then transferred onto pre-patterned tungsten trenches, with all subsequent processing conducted using existing 300 mm fabrication tools. This method introduces a high-κ liner to prevent shorting at the TMD edges, enhancing the performance of the devices. The WSe2 p-type field-effect transistors (FETs) and MoS2 n-type FETs demonstrate drive currents of 100 μA μm⁻¹ and 27 μA μm⁻¹, respectively, with near-zero off-current. The process achieves yields of over 94% across the 300 mm wafer, defined by an on/off ratio exceeding 10⁵. This development also demonstrates quasi-CMOS integration by using different channel materials side-by-side on the same wafer.
Why It's Important?
This advancement in wafer-scale processing of TMDs using EUV lithography represents a significant step forward in semiconductor technology. The ability to integrate different channel materials on the same wafer could lead to more efficient and versatile electronic devices. This technology has the potential to enhance the performance of electronic devices by providing higher drive currents and lower power consumption compared to traditional silicon-based devices. The high yield and integration capabilities could also reduce manufacturing costs and increase the scalability of advanced semiconductor devices. This development is crucial for the semiconductor industry as it seeks to overcome the limitations of silicon and explore new materials for future electronic applications.
What's Next?
The successful demonstration of this technology could lead to further research and development in the integration of TMDs in commercial semiconductor devices. Companies involved in semiconductor manufacturing may explore the adoption of EUV lithography for TMD processing to enhance device performance and reduce costs. Additionally, further studies could focus on optimizing the integration process and exploring other potential applications of TMDs in electronics. The industry may also see increased collaboration between research institutions and semiconductor companies to accelerate the commercialization of this technology.
