Minnesota Iron Ore Offers Path to Cheaper Semiconductors

University of Minnesota Twin Cities researchers found Minnesota's iron ore can be directly converted into semiconductor-grade pyrite without extra purification steps.

University of Minnesota Twin Cities researchers demonstrated that low-purity iron ore from Minnesota's Iron Range can be synthesized into semiconductor-quality pyrite (FeS₂) without additional purification steps. They identified Direct Reduced Grade Taconite ore—a common Minnesota grade—as the most effective type for this process. This discovery leverages Minnesota’s position as the source of 75% of U.S. iron ore production and its $4 billion annual revenue. Published in *Physical Review Applied* (2026), the work shows potential applications in batteries, solar panels, electronics, and water purification using abundant, nontoxic elements.

The mechanism hinges on bypassing traditional semiconductor purification, which typically requires costly and energy-intensive steps. By using locally available ore that avoids impurity-sensitive processing, the approach could reduce material costs for semiconductor manufacturing. For abundance, this directly supports cheaper tech access globally—critical for knowledge and security needs. Lower semiconductor costs would enable more affordable devices for basic needs like clean water systems and energy-efficient electronics.

What to watch: Researchers note this finding was unexpected due to semiconductor sensitivity to impurities. Further testing of additional ore grades and thin-film applications is ongoing. The discovery remains in early validation stages and has not yet scaled to commercial production.

Source: Phys.org