Perovskite solar cells could revolutionize renewable energy—they're cheap to produce and pack a powerful punch in terms of electricity generation. But here's the catch: their stability has always been a major hurdle. Unlike traditional silicon cells, perovskite cells tend to lose efficiency rapidly, making them less reliable for long-term use. That is, until now.
An international team of researchers, led by Prof. Dr. Antonio Abate, has made a groundbreaking discovery. By applying a novel coating to the interface between the perovskite surface and the top contact layer, they've dramatically improved the cells' stability. And this is where it gets exciting: this innovation not only stabilizes the cells but also boosts their efficiency to an impressive 27%, setting a new benchmark in the field. After 1,200 hours of continuous operation under standard lighting conditions, the cells showed no signs of efficiency loss. This research, involving teams from China, Italy, Switzerland, and Germany, was published in Nature Photonics.
The secret lies in a fluorinated compound that forms an ultra-thin, almost monomolecular film between the perovskite and the buckyball (C60) contact layer. This film acts as a protective barrier, chemically isolating the perovskite layer and reducing defects. But here's where it gets controversial: while the 'Teflon effect' of this layer is undeniably effective, some experts argue that scaling this technology for mass production could pose challenges. What do you think? Is this the future of solar energy, or are there still too many hurdles to overcome?
‘It’s like applying a non-stick coating to a pan,’ explains Abate. ‘The intermediate layer prevents defects while maintaining electrical contact, enhancing both stability and efficiency.’ This approach not only increases structural stability but also makes the C60 layer more uniform and compact. The research, spearheaded by Guixiang Li (now a professor at Southeast University in Nanjing, China), also involved collaborations with the École Polytechnique Fédérale de Lausanne (EPFL) and Imperial College London.
And this is the part most people miss: the cells’ stability isn’t just about longevity—it’s about performance under extreme conditions. The coating provides exceptional thermal stability, enduring 1,800 hours at 85°C and 200 cycles between –40°C and +85°C. This makes perovskite cells ideal for tandem applications, such as pairing with silicon cells, thanks to their inverted (p-i-n) structure.
The idea for this innovation has been years in the making. ‘I’ve been thinking about using Teflon-like molecules since my postdoctoral days in Henry Snaith’s lab back in 2014,’ says Abate. ‘Back then, efficiency was a mere 15%, and it dropped significantly within hours. We’ve come a long way.’ These findings open the door for the next generation of highly efficient and stable perovskite-based devices.
But here’s a thought-provoking question: With such promising results, why aren’t perovskite solar cells already dominating the market? Is it a matter of cost, scalability, or something else entirely? Share your thoughts in the comments below.
Original publication: Guixiang Li et al., 'Stabilizing high-efficiency perovskite solar cells via strategic interfacial contact engineering,' Nature Photonics, 2025-11-7.
