Constructing Additives Synergy Strategy to Doctor‐Blade Efficient CH₃NH₃PbI₃ Perovskite Solar Cells under a Wide Range of Humidity from 45% to 82%

Abstract

Abstract Perovskite solar cells (PSCs) have emerged as one of the most promising and competitive photovoltaic technologies, and doctor‐blading is a facile and robust deposition technique to efficiently fabricate PSCs in large scale, especially matching with roll‐to‐roll process. Herein, it demonstrates the encouraging results of one‐step, antisolvent‐free doctor‐bladed methylammonium lead iodide (CH 3 NH 3 PbI 3, MAPbI 3 ) PSCs under a wide range of humidity from 45% to 82%. A synergy strategy of ionic‐liquid methylammonium acetate (MAAc) and molecular phenylurea additives is developed to modulate the morphology and crystallization process of MAPbI 3 perovskite film, leading to high‐quality MAPbI 3 perovskite film with large‐size crystal, low defect density, and ultrasmooth surface. Impressive power conversion efficiency (PCE) of 20.34% is achieved for doctor‐bladed PSCs under the humidity over 80% with a device structure of ITO/SnO 2 /MAPbI 3 /Spiro‐OMeTAD/Ag. It is the highest PCEs for one‐step solution‐processed MAPbI 3 PSCs without antisolvent assistance. The research provides a facile and robust large‐scale deposition technique to fabricate highly efficient and stable PSCs under a wide range of humidity, even with the humidity over 80%.