Modulating the Distribution of Formamidinium Iodide by Ultrahigh Humidity Treatment Strategy for High‐Quality Sequential Vapor Deposited Perovskite (Small 12/2024)

In article number 2307960, Xiao Wang, Longbin Qiu, and co-workers developed an ultrahigh humidity treatment strategy to facilitate the effective diffusion of formamidinium iodide from the top surface to the buried bottom interface on the sequential vapor-deposited bilayer structure.High-efficiency and stable perovskite solar cells deposited by a sequential vapor deposition process with a performance of 22% have been successfully demonstrated. Perovskites