Abstract
Hybrid organic–inorganic halide perovskites have experienced a surge of attention in the past decade because of their promising applications in next‐generation solar cells, with a remarkable improvement of the power conversion efficiency (PCE) from 3.8% to 25.2%. As next‐generation hybrid halide perovskites, 2D hybrid perovskites (2DHPs) expand the connotation of hybrid materials and demonstrate potential to offer higher tunability and more excellent material properties than 3D hybrid perovskites as a result of the reduced dimensionality. Herein, a review on the current research progress on 2DHPs, including structural characterization, materials synthesis approaches, optoelectronic and multiferroic properties, defect states, moisture stability, and related devices applications is presented along with their related computational and theoretical studies. The review is concluded with a discussion of the current challenges and future directions in the field.
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