Entire mirror-like perovskite films for high-performance perovskite solar cells: The role of polar anti-solvent sec-pentyl alcohol

In this work, it is the first time that sec-pentyl alcohol (2-PA) as an environmental-friendly polar anti-solvent technology have been proposed for the fabrication of high-quality perovskite films. Our investigations have confirmed that 2-PA technology exceeds the existing anti-solvent technology, such as toluene, chlorobenzene, diethyl ether and 2-propanol.196