Perovskite Betavoltaics Achieve 10.79 Percent Efficiency

A DGIST-led team led by Professor Su Il In on Jan 13, 2026 reports a perovskite-based betavoltaic cell using carbon-14 that achieves 10.79% energy conversion efficiency, about six times prior best. The researchers used methylammonium chloride additive and isopropanol antisolvent to optimize microstructure, observed an electron avalanche (~400,000 electrons per beta), and demonstrated stable output over more than 15 hours.