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# Iron-Based Solar Cells Reach 26.9% Efficiency Milestone
- URL: https://adjacent.media/signals/iron-based-solar-cells-reach-26-9-efficiency-milestone/
- Published: 2026-10-05T23:16:06.000Z
- Updated: 2026-10-05T23:16:06.000Z
- Description: A research team has demonstrated that Prussian blue, a cheap iron compound, can match the efficiency of today’s best commercial silicon solar cells when used as a perovskite absorber layer.
- Author: Jonathan Greene
- Tags: #signal, theme-connected, hardware, energy, infrastructure

Source: [pv magazine Global](https://www.pv-magazine.com/2026/10/05/perovskite-solar-cell-based-on-prussian-blue-achieves-26-9-efficiency/?ref=adjacent.media)

A research team has demonstrated that Prussian blue, a cheap iron compound, can match the efficiency of today's best commercial silicon solar cells when used as a perovskite absorber layer. This matters because perovskites have long promised cheaper, flexible alternatives to silicon, but struggled with stability and manufacturing; using abundant iron instead of lead or tin sidesteps both toxicity concerns and rare-material supply chains. If durability holds up in field testing, the cost-per-watt advantage could pressure silicon manufacturers to accelerate efficiency gains or price cuts.