Physicists at the Institute of Science and Technology Austria (ISTA) have solved a decade-long mystery: Why “messy” perovskite solar cells are nearly as efficient as high-purity silicon.
Published in Nature Communications in February 2026, the study reveals that the very defects previously thought to hinder performance actually act as “highways” for electricity.
Silicon solar cells require expensive, ultra-pure crystals to prevent charges from getting trapped. In contrast, perovskites are made using cheap, liquid-based methods that leave the material riddled with structural imperfections.
To understand how charges move through these imperfect materials, researchers Dmytro Rak and Zhanybek Alpichshev developed a technique similar to medical angiography. They injected silver ions into the perovskite, which traveled through the crystal and settled into its internal cracks and boundaries, known as “domain walls.”
By converting these ions into metallic silver, the team could visualise a microscopic network spanning the entire material. This network creates internal electric fields that act as a sorting system for energy:
This discovery flips traditional solar physics on its head. While the industry has spent decades trying to eliminate defects in silicon, the ISTA team proved that in perovskites, the defects are the secret to success. These internal “highways” explain why perovskites can be manufactured so cheaply without losing power.
Beyond solar panels, perovskites are showing promise for high-efficiency LEDs and X-ray imaging. By understanding the “highway” mechanism, scientists can now move beyond simple chemical tweaking and start engineering the internal structure of these materials to maximize speed and durability.
This breakthrough provides the first comprehensive physical roadmap for perovskites, potentially accelerating their journey from laboratory prototypes to the rooftops of homes worldwide.
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