Metal halide perovskites (MHPs) have emerged as highly promising candidates for the next generation of photonics and optoelectronic devices, owing to their prominent optical and excitonic properties, as well as the convenience of fabrication. Particularly, ultrathin two-dimensional (2D) MHPs, which are generally prepared by exfoliation, solution growth, and chemical vapor deposition method, have attracted dramatically increasing attentions owing to their combined features of ultrathin 2D morphology and superior performance of MHPs. Despite the growing interest in ultrathin 2D MHPs, there is currently a lack of a comprehensive and systematic overview of the distinct advantages offered by each growth method for producing these materials. This review critically assesses the preliminary studies on the materials design and preparation of ultrathin MHPs. Furthermore, it explores heterostructures based on ultrathin MHPs and offers insights into the challenges and opportunities that lie ahead for this enticing class of 2D materials.

金属卤化物钙钛矿（MHP）由于其突出的光学和激子特性以及制造的便利性，已成为下一代光子学和光电器件的极具前景的候选者。特别是，超薄二维（2D）MHP通常通过剥离、溶液生长和化学气相沉积方法制备，由于其超薄二维形貌和MHP优异性能的结合特征，引起了越来越多的关注。尽管人们对超薄 2D MHP 的兴趣日益浓厚，但目前缺乏对生产这些材料的每种生长方法所提供的独特优势的全面和系统的概述。本综述严格评估了超薄 MHP 材料设计和制备的初步研究。此外，它还探索了基于超薄 MHP 的异质结构，并深入了解了此类诱人的 2D 材料面临的挑战和机遇。