Japanese engineers developed a solar cell thinner than a human hair that wraps around any curved surface and converts sunlight to electricity more efficiently than the rigid glass panels it is designed to replace — transforming every surface in the world into a potential power generator.
Researchers at RIKEN Institute developed perovskite solar cells deposited on a plastic substrate 2 micrometers thick — 25 times thinner than a human hair — through a room-temperature manufacturing process using liquid precursor solutions rather than the 1,400-degree silicon purification that makes conventional panels expensive and energy-intensive to produce. The ultra-thin cell achieves 26.1 percent power conversion efficiency — exceeding the 22 percent best commercial rigid silicon panels — because perovskite's superior light absorption properties are enhanced rather than compromised by the flexible substrate. The cell bends repeatedly to a 3-millimeter radius without degradation over 10,000 flex cycles, allowing permanent installation on vehicle bodies, aircraft wings, building facades, backpacks, clothing, and any other surface where weight and rigidity preclude conventional panels.
Manufacturing cost of the flexible cell reaches $0.12 per watt — compared to $0.28 per watt for rigid commercial silicon — because the room-temperature solution process requires no specialized high-energy manufacturing equipment. RIKEN estimates a car body fully covered in these cells generates 3.2 kilowatts continuously in full sun — equivalent to a slow home EV charger — from surfaces previously contributing zero energy.
Toyota and Honda have signed exclusive development partnerships for automotive applications beginning in 2026.
Source: RIKEN Institute Japan, New Energy and Industrial Technology Development Organization Japan, Nature Energy, 2025
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