Authors
Gang Wang, Zhengyan He, Fenghua Zhang, Qilin Wei, Xiong Li, Ke Jing, Dan Huang, Liang Wang, Zhenhu Zhang, William W Yu
Published in
Advanced materials (Deerfield Beach, Fla.). Oct 30, 2026. Epub Oct 30, 2026.
Abstract
Thermally induced stress accumulation is a major origin of lattice disorder, defect evolution, and ion migration in perovskite solar cells (PSCs), limiting their long-term operational stability. We develop a dynamic molecular scaffold strategy based on the adduct of α-lipoic acid and N-hydroxysuccinimide ester to mitigate thermomechanical degradation through simultaneous thermomechanical stress buffering, lattice anchoring, and adaptive defect healing. During film formation, DL-α-lipoic acid-N-hydroxysuccinimide ester (LA-NHS) undergoes in situ polymerization to establish a crosslinked polydisulfide scaffold at grain boundaries. The dynamic scaffold accommodates thermally induced lattice expansion and contraction, dissipates accumulated stress, anchors the perovskite lattice, and continuously passivates stress-generated defects through reversible disulfide-bond exchange, thereby preserving lattice ordering and improving the thermal durability. Consequently, the optimized PSCs achieve a champion power conversion efficiency (PCE) of 27.19%. The devices retain 91.71% of their initial efficiency after 150 thermal cycles between 15°C and 100°C, and 85.72% after 1500 h at 85°C. The strategy is successfully translated to large-area PSCs (25.02% for 1 cm2 and 22.06% for 10 × 10 cm2). This work establishes a dynamic molecularscaffold framework for managing thermomechanical degradation through stress buffering, lattice anchoring, and adaptive defect healing, providing a route toward efficient, durable, and scalable perovskite photovoltaics.
PMID:
42963917
Bibliographic data and abstract were imported from PubMed on 31 Oct 2026.
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