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.
