2019•Solar RRLRequires access
Chlorobenzene: A Processing Solvent Enabling the Fabrication of Perovskite Solar Cells with Consecutive Double‐Perovskite and Perovskite/Organic Semiconductor Bulk Heterojunction Layers
Jiandong Wang, Xiang Yao, Wen‐Jing Xiao, Yang Bai, Ziwen Xu, Jian Pin Lin, Wei‐Shi Li
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Abstract
Chlorobenzene (CB), which has been used as an anti‐solvent, is demonstrated here as a processing solvent for the fabrication of perovskite films and solar cells. This approach results from the unexpected finding that butylamine‐bound organolead iodides can be dissolved in CB to form precursor solutions. Together with previously established perovskite composition transformation methods, not only conventionally structured perovskite solar cells (PSCs) with a (CH3NH3)PbI3active layer but also nonconventionally structured devices with a consecutive (CH3NH3)PbI3/(C4H9NH3)2PbI4double layer or a mixed poly(triaryl amine) (PTAA) and (CH3NH3)PbI3bulk heterojunction layer are successfully prepared and demonstrated with an optimal efficiency of 16.44%. This is the first time that nonpolar solvents are used for perovskite material processing, which can remove the solvent limitation and open a new avenue for designing and preparing perovskite devices with desired structures.