Polyiodide-assisted fabrication of hybrid perovskite thin films from lead nanolayers on flexible substrates

Despite remarkable progress in solvent-assisted processing of hybrid perovskite thin films, the scalable fabrication of their uniform and pin-hole free layers remains a difficult task, especially on flexible substrates. In contrast, we have demonstrated that the polyiodide-assisted conversion of Pb nanolayers into MAPbI(3) results in the formation of crystalline MAPbI(3) thin films on large flexible substrates already at room temperature. The exposure of stoichiometric Pb/MAI bilayers to iodine vapor leads to the formation of highly reactive polyiodide melts MAI(3(L)), which instantly react with the Pb nanolayers converting them into pure MAPbI(3) films without byproducts or unreacted components.

Automated summary

This research demonstrates that the polyiodide-assisted conversion of Pb nanolayers into MAPbI(3) can result in the formation of crystalline MAPbI(3) thin films on large flexible substrates at room temperature, without any byproducts or unreacted components.