Solution-Processed Perovskite/Polymer Nanocomposites for Advanced Optoelectronic Devices

Emerging optoelectronic technologies increasingly demand unconventional materials and fabrication strategies capable of delivering cost-effective, versatile, and high-performance device platforms. Metal halide perovskites are uniquely positioned to meet these requirements owing to their solution-processable synthesis, exceptional optoelectrical properties, and intrinsic mechanical flexibility. However, rapid precursor reaction kinetics often give rise to uncontrolled crystallization and high densities of atomic defects. In addition, the design of perovskite active layers for mechanically deformable devices using either presynthesized nanostructures or pure precursor solutions remains challenging, as these materials are prone to fracture under severe bending or stretching, limiting their applicability in wearable platforms. Achieving long-term environmental stability of hygroscopic perovskite nanostructures presents an additional barrier to commercialization. To address these challenges, the incorporation of polymers into perovskite systems has been considered a powerful and versatile approach. This review summarizes the fundamental principles governing the synthesis of perovskite/polymer nanocomposites and highlights their impact on diverse optoelectronic applications. Particular emphasis is placed on coordination chemistry associated with metal ion-polymer complexes, which plays a crucial role in nanocomposite formation and processability. We discuss solution-processed platforms including light-conversion and light-guiding structures, mechanically deformable solar cells, light-emitting diodes, and photodetectors. Finally, we outline the key advantages, current limitations, and future research opportunities of perovskite/polymer nanocomposites, offering insights into their potential to enable next-generation optoelectronic technologies.