Atmospheric Humidity Underlies Irreproducibility of Formamidinium Lead Iodide Perovskites

作者：Keonwoo Park, Shaun Tan, Tim Kodalle, Do Kyung Lee, Maged Abdelsamie, Ji‐Sang Park, Joo‐Hong Lee, Joo‐Hong Lee, Sung‐Kwang Jung, Jeong Hoon Ko, Nam‐Gyu Park, Carolin M. Sutter‐Fella, Yang Yang, Jin‐Wook Lee, Jin‐Wook Lee · 发表于：Advanced Materials · 年份：2023 · DOI：10.1002/adma.202307265 · 被引用次数：38 · 研究领域：Perovskite Materials and Applications、Quantum Dots Synthesis And Properties、Chalcogenide Semiconductor Thin Films

Abstract Metal halide perovskite solar cells (PSCs) are infamous for their batch‐to‐batch and lab‐to‐lab irreproducibility in terms of stability and performance. Reproducible fabrication of PSCs is a critical requirement for market viability and practical commercialization. PSC irreproducibility plagues all levels of the community; from institutional research laboratories, start‐up companies, to large established corporations. In this work, the critical function of atmospheric humidity to regulate the crystallization and stabilization of formamidinium lead triiodide (FAPbI 3 ) perovskites is unraveled. It is demonstrated that the humidity content during processing induces profound variations in perovskite stoichiometry, thermodynamic stability, and optoelectronic quality. Almost counterintuitively, it is shown that the presence of humidity is perhaps indispensable to reproduce phase‐stable and efficient FAPbI 3 ‐based PSCs.