As advanced chip manufacturing increasingly relies on Extreme Ultraviolet (EUV) lithography， a domain currently dominated by the Netherlands-based ASML， a United States startup named Substrate is emerging with a novel technology aiming to challenge ASML’s leading position.
Substrate’s ultimate ambition is to establish a wafer foundry business in the US， directly competing with TSMC. However， their immediate focus is the development of a new type of lithography machine， positioning them as a challenger to ASML.
The prohibitive cost of current advanced chip manufacturing processes， heavily dependent on EUV lithography， is a significant barrier. Existing NA 0.33 EUV lithography machines are priced around $200 million， while the next-generation NA 0.55 EUV machines are expected to cost $400 million. A single advanced process wafer fab can necessitate an investment of up to $15 billion.
Substrate’s breakthrough lies in its development of an X-ray lithography machine. This innovative approach uses a particle accelerator to generate a light source with a shorter wavelength， potentially cutting costs by half compared to existing technologies. This addresses the high expenses associated with EUV， which is currently the only viable path for leading-edge semiconductor fabrication.
James Proud， the founder of Substrate， stated that their lithography machine aims to reduce the production cost of advanced wafers from an estimated $100，000 to around $10，000. The company targets mass production by 2028， with the goal of making US chip production cost-competitive with that of China. This objective is particularly significant given the global geopolitical landscape and emphasis on semiconductor supply chain resilience.
The company has secured $100 million in funding at a $1 billion valuation， attracting interest from numerous US venture capital firms. Albeit without government backing yet， their venture is expected to garner considerable attention from US officials， especially considering the nation’s strategic interest in bolstering its domestic semiconductor manufacturing capabilities.
While Substrate has not disclosed specific technical details of their lithography machine， the use of X-rays in lithography is not entirely new; it was explored in the US decades ago， and there are ongoing efforts utilizing X-ray routes in China. X-rays offer the advantage of extremely high precision， with wavelengths potentially reaching 0.1 to 10nm， which is significantly shorter than the 13.5nm wavelength of EUV. This shorter wavelength is crucial for achieving smaller feature sizes in semiconductor manufacturing.
However， X-ray lithography faces several considerable challenges. These include low light source efficiency， exceptionally demanding mask requirements， and the necessity for entirely new photoresist materials. A core issue is the fundamental incompatibility with current chip manufacturing processes， essentially requiring a complete overhaul and a departure from established methodologies. This means that any investment in X-ray lithography would necessitate building entirely new ecosystems and supply chains.
In essence， if X-ray lithography offered a straightforward and universally superior solution， it would likely have been adopted widely much earlier. If a startup in China were to claim the ability to replace ASML and TSMC with such technology， it would likely be met with skepticism and accusations of being an unrealistic venture. However， in the US context， such ambitious claims can be framed as national initiatives， particularly amidst ongoing concerns about domestic innovation and manufacturing self-sufficiency in the critical semiconductor sector.
