A new study has revealed a surprisingly simple way to improve one of the biggest weaknesses of next-generation solar cells.
Researchers from Korea University and University of Surrey have shown that just bringing two special solar materials into contact can make them both more efficient and more durable—without adding any extra chemicals or coatings.
The work, published in Nature Energy, focuses on perovskite solar cells. These cells have attracted global attention because they are cheaper and easier to produce than traditional silicon panels.
In recent years, their efficiency has improved quickly, making them strong competitors to existing solar technology.
However, one major problem has held them back: they tend to break down too quickly, especially when exposed to heat and moisture.
The new method tackles this problem in a very straightforward way. Instead of changing the material itself, the researchers simply placed two different perovskite films in contact with each other.
This contact triggered a natural interaction at the boundary between the films.
As a result, the internal structure of the material became more orderly and stable—not just at the surface, but throughout the entire layer.
This improved structure helps the solar cell work better. When sunlight hits the material, it creates tiny charged particles that carry energy. In less stable materials, these particles quickly lose energy as heat.
In the improved material, they last longer and move more efficiently, which means more electricity can be generated. In fact, the solar cells made using this method reached an efficiency of 25.61%, a very high level that was independently confirmed.
The researchers call this process “contact-triggered cationic interaction,” or CCI. In simple terms, when the two films touch, the charged particles inside them rearrange themselves into a more organized pattern. This reduces tiny defects in the material that would otherwise waste energy.
To prove what was happening at such a small scale, the team used an advanced imaging technique that can map chemical structures at the nanoscale. This allowed them to directly see how the material changed and confirmed that the improved alignment was happening exactly as expected.
Equally important, the new structure is much more resistant to damage. In stress tests that simulate real-world conditions, the treated material needed about twice as much heat energy to break down compared to similar materials. This suggests that solar panels using this approach could last much longer in everyday use.
The beauty of this discovery lies in its simplicity. By carefully controlling how two layers of material touch, scientists can improve both performance and durability at the same time.
If this method can be applied on a large scale, it could help bring perovskite solar cells closer to widespread use, offering a cheaper and more efficient way to generate clean energy in the future.
