Lamination and ITO barriers synergistically enhance stability in perovskite solar cells

While perovskite solar cells (PSCs) have achieved remarkable power conversion efficiencies, their long-term stability remains a critical bottleneck hindering commercialization. The degradation mechanisms have not yet been fully elucidated, and effective stabilization strategies require further development. Here, we find that laminated PSCs exhibit exceptional stability without the need for additional modification. Systematic analysis reveals that recrystallization during the lamination process induces high-quality interfacial contact. Furthermore, barrier layers, particularly the indium tin oxide (ITO) interlayer, effectively suppress the onset of decomposition cascades by forming tightly bonded, ion-blocking interfaces. As a result, a high-cohesive-energy layer in the laminated PSCs preserves interfacial dynamic equilibrium, thereby enabling exceptional long-term device stability. This work offers fundamental insights into interfacial degradation pathways and establishes interfacial chemistry engineering via high-barrier materials as a broadly applicable strategy for enhancing the durability of perovskite optoelectronics. • The stability mechanisms in laminated perovskite solar cells are systematically investigated and compared with those in conventional architectures. • Comparative analysis emphasizes the critical role of iodine species escaping from the perovskite layer and their subsequent reactions with adjacent functional layers. • Introducing functional layers with high cohesive energy effectively suppresses degradation pathways within the perovskite layer, while maintaining a dynamic equilibrium across interfaces markedly enhances device stability.