# Rubber Additive Gives Perovskite Solar Its Missing 1,700 Hours

- slug: rubber-additive-gives-perovskite-solar-its-missing-1700-hours
- date: 2026-03-31
- category: Space & Aerospace

A rubber vulcanization chemical helped perovskite-silicon tandem cells retain 91 percent efficiency after 1,700 hours of continuous operation — on industrial-grade TOPCon wafers, not bespoke lab cells. Whether it survives a summer on a rooftop in Arizona remains an open question.

---