超薄型ペロブスカイト太陽電池の高効率化に向けた新展開

抄録

Ultrathin perovskite solar cells (PSCs) fabricated on micron-thick plastic substrates have recently attracted significant attention due to their excellent flexibility and lightweight nature. By reducing the total substrate thickness to 3 μm, both mechanical flexibility and power-to-weight ratio were significantly improved compared to conventional thin-film photovoltaics. Our group has developed high-efficiency PSCs on such ultrathin substrates using a tin oxide (SnO₂)-based n-i-p structure. By employing thermally stable, transparent parylene-C/SU-8 substrates and flexible, amorphous ITO electrodes, our devices achieved an efficiency of 18.2%, comparable to that of PSCs on rigid glass substrates, while maintaining exceptional bending stability. These PSCs exhibit excellent mechanical durability, remaining stable even after bending deformations with a radius as small as 500 μm. Owing to their ultra-flexible and lightweight characteristics, ultrathin PSCs are being actively explored for use in wearable indoor energy sources, solar-powered drones, and space-based applications. Their flexibility, low weight, and high radiation tolerance against cosmic rays make ultrathin PSCs promising candidates for next-generation deployable solar paddles in space environments. This review outlines recent advances in ultrathin PSC technology, highlights our group’s work on high-efficiency SnO₂-based n-i-p structured ultrathin PSCs, and explores future pathways for their application in wearable electronics, aerospace, and space systems based on printed electronics techniques.