MIT Startup CDimension Aims to Accelerate 2D Semiconductor Revolution, Challenging Industry Timelines
A new approach to manufacturing 2D semiconductors could dramatically shorten the timeline for their integration into advanced computer chips, according to a startup emerging from MIT. While industry giants like Intel, Samsung, and TSMC anticipate a decade or more before these materials replace key components in silicon transistors, CDimension believes commercial viability is within reach in half that time.
Overcoming the Temperature Barrier in 2D Material Growth
CDimension has developed a proprietary process for growing molybdenum disulfide (MoS2) – a leading 2D semiconductor – directly onto silicon wafers at a relatively low temperature of 200 °C. This breakthrough addresses a critical challenge in the field: traditional methods for creating 2D materials require temperatures exceeding 1,000 °C, which would damage existing silicon circuitry. “A lot of people think of 2D semiconductors as something that’s still in the laboratory,” explained CDimension CEO and co-founder Jiadi Zhu. “But CDimension has a proprietary tool designed for 2D material growth…and we’ve addressed a lot of critical [2D materials] problems regarding wafer-scale uniformity, regarding device performance and variation, regarding device reliability, and regarding compatibility with silicon manufacturing processes.”
Currently, researchers often deposit 2D semiconductors separately and then painstakingly transfer them to silicon, a process that is both complex and expensive. CDimension’s method allows for direct growth, paving the way for layered 3D chips constructed from 2D devices.
A New Business Model: 2D Semiconductor Integration as a Service
CDimension is pioneering a unique business model to accelerate adoption. The company offers to ship silicon wafers pre-grown with 2D materials, allowing customers to evaluate performance and build prototype devices. Alternatively, clients can send in their existing silicon wafers, and CDimension will grow MoS2 or other 2D materials directly on top, enabling seamless integration with existing circuits. “We’re showing the possibilities with silicon plus 2D material,” Zhu stated. “But 2D material might be used for the highly scaled logic devices as well. That can be the next step.” This approach positions CDimension as a key enabler for companies looking to explore the benefits of 2D semiconductors without significant upfront investment in new manufacturing infrastructure.
Industry Validation at IEEE IEDM 2024
The potential of 2D semiconductors received further validation in December 2024 at the IEEE International Electron Device Meeting. Chipmakers including Intel, Samsung, and TSMC presented research exploring the use of MoS2 and other 2D materials to replace silicon nanosheets in future transistors. Simultaneously, Zhu and his team, collaborating with researchers from MIT, demonstrated that their low-temperature synthesis method could produce MoS2 transistors with stacked channels, mirroring the architecture of advanced nanosheet transistors. Their simulations suggest these devices could surpass the performance requirements of the future 10A (1-nanometer) node.
Power Efficiency: The Driving Force Behind 2D Semiconductors
A primary motivation for transitioning to 2D semiconductors is the potential for significant power savings. Transistors lose power both when active (dynamic power) and inactive (static power). Due to their incredibly thin profile – just over 0.6 nm – 2D transistors can operate at roughly half the voltage of current silicon devices, dramatically reducing dynamic power consumption. Furthermore, MoS2 possesses a bandgap more than twice that of silicon, minimizing leakage current and lowering static power loss. According to Zhu, devices fabricated using CDimension’s materials have demonstrated energy consumption as low as one-thousandth that of traditional silicon devices.
Beyond MoS2: A Comprehensive 2D Material Portfolio
CDimension’s offerings extend beyond MoS2, an n-type semiconductor. The company also provides tungsten diselenide, a p-type semiconductor, and 2D insulating films like hexagonal boron nitride. This comprehensive portfolio is essential for building complete CMOS chips based on 2D materials.
The company’s innovative approach and early successes suggest that the future of chipmaking may arrive sooner than many in the industry anticipate.
