Abstract:

Halide perovskite materials have emerged as a research hotspot in new energy technologies due to their remarkable advantages in photoelectric conversion efficiency, while three-dimensional (3D)/two-dimensional (2D) perovskite heterojunctions have attracted particular attention owing to their unique band structures and flexible regulation capabilities for carrier behavior. This review focuses on the controllable preparation and performance optimization of 3D/2D halide perovskite heterojunctions. It first summarizes the concept, advantages, and conventional preparation methods of 3D/2D perovskite heterojunctions, including solid-liquid post-spin-coating methods, solid-gas vapor deposition approaches, and solidsolid reaction techniques. Subsequently, effective strategies for enhancing the performance of 3D/2D perovskite heterojunctions through interface engineering, material engineering, and device structure optimization are systematically explored. The review then comprehensively summarizes and evaluates recent research progress in the application of 3D/2D heterojunctions in solar cells and photodetectors. Finally, current challenges regarding the stability and environmental adaptability of 3D/2D perovskite heterojunctions are discussed, along with systematic perspectives on future development trends in this research field. This work aims to provide feasible ideas and optimization schemes for realizing the widespread application of 3D/2D perovskite heterojunctions in photoelectric fields.