These ultra-thin bendy solar panels are so light you can wear them

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🗞️ Driving the news: At Expo 2025 Osaka, staff are testing ultra-thin, flexible solar panels integrated into utility vests that power wearable neck fans — a world-first application of perovskite solar technology in wearables
• Developed by Toyota Group’s Toyoda Gosei, Enecoat Technologies, and Seiren, the panels weigh under 4 grams, charge even in low light, and highlight the versatility of perovskites compared to traditional silicon-based panels
• The initiative also showcases other perovskite applications, from curved “smart poles” to glass facades, signaling a push to bring solar energy into urban life

🔭 The context: Perovskites, first applied in solar cells in 2009, offer higher light absorption and flexibility at lower production costs than silicon, enabling installations on surfaces previously unsuitable for solar, such as textiles and lightweight structures
• Japan, with limited land for large solar farms but ample perovskite resources, is heavily investing in the technology to meet its renewable energy goals
• However, perovskites still face challenges of durability and lead content, which researchers are working to overcome

🌍 Why it matters for the planet: Wearable and urban-integrated solar technologies can decentralize power generation, reduce reliance on fossil fuels, and bring clean energy closer to where it is consumed, making cities more resilient and efficient
• If stability and safety concerns are resolved, perovskites could accelerate the transition to renewable energy by complementing — or eventually replacing — silicon in diverse settings
• Such innovations are crucial as urban areas account for the bulk of global energy use and emissions

⏭️ What's next: Over the coming months, real-world performance data from Expo 2025 will inform the next steps in scaling perovskite technologies for wearables, building facades, and mobile devices
• Researchers continue to work on improving the longevity of perovskites, with promising new methods to extend their lifespan and minimize lead leakage risks
• Japan’s target of 20 GW of solar power from perovskites by 2040 could spur further innovation and commercialization
• Industry observers will watch closely whether the sector can deliver durable, cost-competitive products within the next five years

💬 One quote: "We can install solar panels even in places where it was impossible before… I think the best way to use it is on a smartwatch or your smartphone." — Tamotsu Horiuchi, CTO, Enecoat Technologies

📈 One stat: Perovskite-silicon tandem panels, now commercially available, deliver up to 20% more energy output compared to standard silicon panels alone

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