The only commercially available lead iodide (PbI₂) by 2Dsemiconductors USA. PbI₂ crystallizes in a CdI₂ structure, in which I- anions are packed hexagonally, and each Pb²⁺ cation is connected to six I- anions in alternating layers, forming a typical octahedral structure. The repeating I-Pb-I trilayer stacks in various ways and are bounded by van der Waals force, and this in return, offers a way to achieve mono- and few-layer flakes by mechanical and chemical exfoliation due to the weak interlayer forces between adjacent layers. PbI₂ crystals are perfectly layered and has 2.4 eV direct band gap. Crystals arrive with perfect 0001 cleavage, and are grown by float zone technique over 4 months for perfect crystallization. 

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