High‐Crystalline 2D Layered PbI₂ with Ultrasmooth Surface: Liquid‐Phase Synthesis and Application of High‐Speed Photon Detection

A new, simple, and replicable solution method is reported for the growth of 2D materials. Importantly, the method has no particular requirement on the substrate, so metals, glass, silicon, sapphire, flexible organics, and other wafers insoluble in water are all applicable for this method. Such compatibility cannot be achieved by other methods. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.