Low‐Dimensional‐Networked Cesium Lead Halide Perovskites: Properties, Fabrication, and Applications

Abstract All‐inorganic cesium lead halide perovskites have emerged as promising optoelectronic materials with excellent photophysical properties and great potential in a variety of applications. In parallel with the most investigated CsPbX 3 , its derivates, Cs 4 PbX 6 and CsPb 2 X 5 , with low‐dimensional‐networked structures have also attracted great attention. In this review, recent advancements on the low‐dimensional‐networked cesium lead halide perovskites (Cs 4 PbX 6 and CsPb 2 X 5 ) are reviewed systematically. The optical properties and direct controllable synthesis methods are first introduced. The transformation between Cs x Pb y X z and their hybridization are then presented, followed by their wide applications. Finally, challenges and prospects of this class of perovskites are introduced.