Perovskite solar cells just surpassed 26% efficiency, leaving traditional silicon panels behind in the lab—lighter, cheaper, and more efficient

For years, perovskite solar cells have been the “almost there” technology of clean energy. They are cheaper to produce than silicon, incredibly efficient at converting sunlight into electricity, and flexible enough for next-generation applications like building-integrated solar panels.

But one stubborn problem has kept them out of large-scale commercialization: they degrade too quickly under light.

Now, an international research team from China, Macau, and France may have found a way around that limitation—by fixing the chemistry from the inside out.

The researchers focused on what actually causes perovskite materials to break down. When exposed to light and oxygen, metal halide perovskites form highly reactive superoxide radicals. These radicals attack the crystal structure internally, damaging chemical bonds and gradually killing performance.

Traditional solutions, such as encapsulation, try to block oxygen and moisture from the outside. But that approach doesn’t fully stop the reactions happening inside the material.

Instead, the team introduced a clever chemical additive: a hindered amine light stabilizer. These molecules are already widely used in plastics to prevent sunlight damage, but this is one of the first times they’ve been successfully applied inside perovskite solar cells.

Under illumination, the hindered amine converts into a nitroxyl radical that actively neutralizes destructive superoxide radicals as they form. Even better, this process is regenerative. The stabilizer isn’t used up, meaning it can keep protecting the material continuously throughout operation.

The benefits don’t stop at chemical stability. The additive also binds to common defects in perovskite films, especially at grain boundaries and surfaces.

These defects normally trap charge carriers and waste energy as heat. By passivating them, the stabilizer enables smoother films, larger crystal grains, and cleaner charge transport.

The results are striking. The team achieved a certified power conversion efficiency of 26.74%, fabricated under ambient air conditions. In stability tests, unencapsulated cells retained over 95% of their initial efficiency after 1,000 hours of continuous illumination—far beyond what many high-efficiency perovskite devices manage today.

Most importantly, this approach fits neatly into existing manufacturing processes. That makes it a strong candidate for accelerating real-world applications, from tandem silicon-perovskite panels to building-integrated solar systems.

This study sends a powerful message: light-induced instability in perovskite solar cells isn’t an unavoidable flaw. It’s a chemical problem—and now, a chemically solvable one.

Compared to conventional silicon solar panels, perovskite solar cells stand out in several important ways. Traditional silicon panels are rigid, heavy, and expensive to manufacture because they require ultra-pure materials and high-temperature processing, but they are very durable and widely used.

Perovskite solar cells, on the other hand, can be made at much lower temperatures using simpler, cheaper production methods, making them potentially far less costly. They are also thinner, lighter, and more flexible, allowing use on windows, walls, or curved surfaces where standard panels cannot be installed.

In terms of performance, silicon panels typically reach around 20–23% efficiency, while perovskite cells have already exceeded 26% in the lab.

Although silicon still wins on long-term durability, recent chemical advances are rapidly closing this gap, making perovskite technology a strong next-generation alternative rather than just a laboratory curiosity.

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