China’s new solar material fixes key flaw in perovskite design

Researchers at the Chinese Academy of Sciences have developed a novel self-assembling radical-based molecular material that addresses a critical weakness in perovskite solar cells: the unstable hole-transport layer (HTL). This layer, essential for moving positive charges after light absorption, has traditionally been fragile, expensive, and difficult to fabricate uniformly at large scales, limiting the commercial viability of perovskite solar technology. The new "double-radical self-assembled molecule" forms a smooth, defect-free film without complex processing, significantly improving carrier-transport rates and stability under operational conditions. Solar cells incorporating this material demonstrate virtually no performance degradation even after thousands of hours of continuous use, marking a major step toward scalable, roll-to-roll manufacturing of perovskite panels. The breakthrough, led by researchers including Qin Chuanjiang and Wang Lixiang, has received efficiency certification from the U.S. National Renewable Energy Laboratory (NREL), validating the innovation internationally. This advancement could accelerate China's ability to