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The march toward ever-smaller electronic devices has long been constrained by a fundamental materials problem: as conductors shrink to nanoscale dimensions, their electrical resistance skyrockets. But researchers at Stanford University have now identified a remarkable solution in niobium phosphide (NbP), a material that defies conventional behavior and maintains extraordinary conductivity even when reduced to ultrathin films just a few nanometers thick.
Conductivity issue at nanoscale level
Copper and other metals conduct electricity with efficiency. However, their resistance increases dramatically when they are used as interconnects in integrated circuits below 10 nanometers. This occurs because electrons traveling through such thin conductors constantly collide with the material’s surfaces and internal defects, scattering in ways that impede current flow.
Various solutions have been explored, including alternative metals like cobalt and ruthenium, as well as novel barrier layers and surface treatments. These approaches yielded improvements that are incremental at best, with none fundamentally solving nanoscale electron scattering. Finding a truly superior ultrathin conductor has therefore remained one of materials science’s most pressing challenges.
Discovery of NbP
“Niobium phosphide is what researchers call a topological semimetal,” stated the Stanford Engineering announcement in January 2025, “which means that the whole material can conduct electricity, but its outer surfaces are more conductive than the middle. As a film of niobium phosphide gets thinner, the middle region shrinks but its surfaces stay the same, allowing the surfaces to contribute a greater share to the flow of electricity and the material as a whole to become a better conductor.” The Stanford team, working within the field of topological semimetals, turned its attention to niobium phosphide after theoretical predictions suggested it might possess unusual electronic characteristics. NbP belongs to a category of topological semimetals known as Weyl semimetals, which host exotic quasiparticles called Weyl fermions. These particles behave as if they are massless and exhibit remarkable resistance to the scattering processes that plague conventional conductors.
What the researchers discovered exceeded expectations. When they fabricated NbP films with thicknesses ranging from bulk crystals down to just a few nanometers, they observed that the material’s conductivity remained stable. Unlike copper, which sees its resistivity increase by orders of magnitude at comparable dimensions, niobium phosphide maintained low resistance even in its thinnest forms. This behavior stems from the topological protection of its surface states, where electrons travel along the material’s exterior in channels that are inherently resistant to backscattering.
As such, NbP thin films could outperform copper by substantial margins at nanoscale thicknesses. At dimensions below 5 nanometers, where copper becomes nearly unusable due to resistivity increases, niobium phosphide continued to function as an efficient conductor.
The discovery arrives at a critical moment for the semiconductor industry. As chipmakers push toward 2-nanometer process nodes and beyond, the interconnect problem has become increasingly urgent. Current projections suggest that within the next technology generations, conventional copper interconnects will become impractical for the finest wiring layers in advanced processors. A material that can maintain conductivity at these scales could therefore prove transformative.
If niobium phosphide proves practical against the challenges of scaling production and integrating into complex chip architectures, it could represent the first commercial deployment of a quantum material. This, in turn, would pave the way for other materials like it in real-world applications.
Brazil’s niobium edge
The global niobium market has long been dominated by Brazil, which controls roughly 90 percent of world production through deposits in Minas Gerais – the most important is the Araxá deposit, operated by Companhia Brasileira de Metalurgia e Mineração (CBMM), which has long marketed ferroniobium and high‑purity niobium products to steelmakers and advanced‑materials users worldwide. Public estimates and company disclosures suggest that Araxá alone contains reserves sufficient to support production “for more than 200 years” at current rates, underscoring how heavily the global market depends on a single complex. Other Brazilian niobium operations include Chinese company CMOC’s Catalão mine in Goiás and smaller deposits in Pará and Amazonas, but CBMM’s mine and processing plant remain the backbone of the world’s supply.
This concentration has created a supply chain vulnerability that major consuming nations have noted with concern, though niobium’s relatively stable pricing and reliable availability have historically prevented serious disruptions.
Should semiconductor‑grade niobium phosphide transition from lab curiosity to production material, Brazil’s role would shift from a quiet supplier of metallurgical niobium to a pivotal node in a higher‑value technology chain. Unlike ferroniobium for steelmaking, electronic‑grade niobium would require tighter impurity control, advanced refining sequences and new downstream partnerships with chemical processors and wafer material specialists.
CBMM has already signaled this strategic turn by creating dedicated technology programs and joint laboratories with universities and device makers. However, Brazil does not currently host a large, integrated semiconductor manufacturing ecosystem comparable to those in East Asia or North America. Any move into niobium phosphide for interconnects would therefore require aligning traditional mining and metallurgical expertise with international partners in deposition equipment, epitaxy and chip fabrication.
New demand category
If niobium phosphide achieves widespread adoption in semiconductor manufacturing, demand for niobium will undergo a fundamental transformation. Currently, the electronics sector accounts for only a tiny fraction of niobium consumption, with superalloys and superconducting applications representing the primary nonsteel uses. A successful transition to NbP-based interconnects in advanced chips could create an entirely new demand category that, while perhaps modest in tonnage compared to steel applications, would be extraordinarily valuable on a per-kilogram basis.
Semiconductor-grade niobium requires far higher purity than metallurgical applications, and niobium phosphide synthesis demands precise chemical calculations and crystalline quality. This distinction means that electronics demand would not simply add volume to existing supply chains but would instead require dedicated refining and processing infrastructure capable of producing material meeting stringent specifications. Nations and companies that develop this capability early would secure significant competitive advantages.
For China, the implications are multifaceted. The country’s massive steel industry ensures that it will remain a dominant niobium consumer regardless of electronics applications, providing a stable foundation of demand. However, the emergence of high-value semiconductor uses would add a strategic dimension to niobium that it currently lacks. Rather than merely being an important industrial input, niobium could join the ranks of materials considered critical for national technological competitiveness.
Inner Mongolia's strategic importance
China consumes approximately 25 to 30 percent of global niobium production, making it the single largest national market for the element. Much of this consumption has historically served the steel industry, where niobium acts as a microalloying agent that dramatically improves strength, toughness and weldability. High-strength low-alloy steels containing small amounts of niobium find extensive use in pipelines, automotive components, structural applications and shipbuilding, all sectors in which China maintains enormous production capacity.
China has sought to reduce its dependence on Brazilian imports by developing domestic niobium resources, and Inner Mongolia has emerged as the most promising source within Chinese territory. The Bayan Obo mining district in Inner Mongolia, already famous as the world’s largest rare earth deposit, contains significant niobium mineralization associated with its carbonatite geology. Its complex mineralogy means that niobium occurs alongside rare earth elements and iron ore, and extraction has generally treated niobium as a byproduct rather than a primary target. Nonetheless, the quantities present are substantial, and more focused development could significantly increase Chinese niobium output.
These resources, however, require huge investment in mining, processing and refining infrastructure, as separating niobium from ore and achieving semiconductor-grade purity demand advanced metallurgical capabilities. Additional deposits have been identified in other locations within Inner Mongolia [TM1] and elsewhere in China, though extraction and processing capabilities remain less developed than those of the Brazilian operations. However, China has repeatedly demonstrated willingness to commit substantial funds when justified by strategic considerations.
Semicon supply chain implications
China’s ongoing efforts to build its semiconductor industry have been constrained by dependence on foreign equipment, software and materials. Export controls targeting advanced chipmaking capabilities imposed by the US and other countries have presented additional complications. In this context, niobium phosphide could present a potential opportunity for China to leapfrog existing approaches rather than simply catching up.
If China can master NbP thin-film deposition and integration methods, it could gain a competitive advantage in next-generation chip interconnect technology. Domestic niobium supplies from Inner Mongolia would support this effort by reducing vulnerability to potential supply disruptions.
Looking ahead
The discovery of niobium phosphide’s exceptional properties as an ultrathin conductor opens a new chapter in the relationship between critical minerals and advanced technology.
Whether niobium phosphide ultimately transforms nanoelectronics remains to be seen, but its potential has already begun to influence calculations about resource security, technological competitiveness and the future of the semiconductor industry.
China’s pursuit of localization
Localization efforts in materials and technologies in China are driven by a combination of concerns over supply chain vulnerabilities, geopolitical tensions and the desire to move up the value chain. Because of this, Beijing has systematically pursued self-sufficiency across a wide spectrum of critical sectors.
This initiative began decades ago but underwent dramatic acceleration after several watershed moments. The 2018 ZTE crisis, when American sanctions nearly crippled the Chinese telecom giant due to its dependence on US chips, served as a stark warning.
The subsequent restrictions on Huawei and the broader technology decoupling between China and the US transformed what had been a long-term aspiration into an urgent national priority.
The government has mobilized massive resources for developing domestic capabilities in semiconductors, advanced materials, precision manufacturing equipment and scientific instruments as well as industrial software.
The results may have been uneven but increasingly significant. In some areas – such as battery materials, solar panel manufacturing and certain segments of the semiconductor supply chain – China has achieved not just self-sufficiency but global dominance. In others, particularly advanced logic chips and the equipment used to manufacture them, substantial gaps remain despite billions in investment.
Phosphorus
China accounts for a significant share of global phosphate rock production, with Morocco holding the largest reserves. For elemental phosphorus specifically – the refined form needed for industrial applications including semiconductor materials – China’s dominance is even more pronounced. Chinese producers control a substantial majority of global capacity for yellow phosphorus production, benefiting from abundant raw materials, low-cost electricity in certain provinces and established industrial infrastructure.
Leveraging this advantage, China is pursuing indium phosphide (InP) wafer production, eyeing potential high demand driven by developments in the AI and communications fields. Yole Intelligence projects that the InP substrate market will reach $6.4 billion in 2028 from $3 billion in 2022 at a CAGR of 13.5 percent. At present, Chinese suppliers have realized 2 to 4-inch low-end and midrange units and have begun trial production of 6-inch types.
Hubei JFS Laboratory has announced its 6-inch InP wafers, made using its internally developed metal-organic chemical vapor deposition (MOCVD) equipment and substrate technology. From this combination, the maker claims to have improved material utilization by 30 percent, reducing production costs by 30 to 40 percent. The company hopes to extend application to smart grids and electric vehicles, with further efforts focusing on upgrading wavelength uniformity to ±0.5nm for quantum communication, terahertz imaging and future uses.
The market for InP devices is expected to grow significantly through 2030. In 2025, it exceeded $4.5 billion, according to QY Research. Optical communication, laser radar and RF devices accounted for 52, 28 and 15 percent of the total, respectively. In China, Yole Intelligence said that this segment hit $2.08 billion in the same year, maintaining double-digit growth that would be the trend in the next several years.
Niobium
In past years, Chinese research institutes, universities and manufacturers have achieved breakthroughs in lithium niobate.
Through cooperation with Shandong University and Jinan University, which designed wafer production equipment and the technique to grow wafers and control their defects, Shandong Hengyuan was able to make a 12-inch high-performance lithium niobate wafer.
Compared to 8-inch types, this size can double or even triple the integration on one chip, which lowers device production cost by over 50 percent. It ensures faster processing and computing capability and lower power dissipation in processors, matching requirements in wireless communication, high-definition radar, AI and video processing applications.
China's reserves
According to the Ministry of Natural Resources, China’s proven reserves of niobium are about 4.7 million tons, ranking second worldwide. In addition to Bayan Oro, these are found in Yichun in Jiangxi, Baicheng in Xinjiang, Huayang in Shaanxi and other locations. Despite this trove, Chinese companies turned to high-grade imports from Brazil. But in recent years, they have come up with new techniques to improve ore grade and utilization ratio.
The situation is better in phosphate ore mining. Deposits of this rock, called Wenfu phosphate ore after the operator of the mines, are found in abundance between Wen’an and Fuquan in Guizhou province. The site has the largest open-pit mine in China, boasting reserves of up to 87.95 million tons and an annual capacity of 3.5 million tons.
There is also the Yangchang phosphate ore, named after the town in Yunnan province, where it was discovered. This location has the largest single phosphatic deposit in Asia, with total reserves as high as 4.3 billion tons.
Further exploration will be pursued in the coming years.
