(1−5) A deep understanding of solvent chemistry is beneficial to the development of solution-processed material systems and their devices.
Solvents play essential roles in chemical, physical, and biological processes. The disclosed solvent gaming mechanism guides the solvent selection for fabricating high-quality perovskite films and thus high-performance PSCs and modules.
While both intermediates can be evolved into α-FAPbI 3 below the δ-to-α thermodynamic temperature, the hydrogen-bond-favorable kind could form defect-less α-FAPbI 3 via sidestepping the break of strong coordination bonds. Depending on their basicity, solvents exhibit their own favorite bonding selection with FA + or Pb 2+ cations by forming either hydrogen bonds or coordination bonds, resulting in two different kinds of intermediate structures. This work systematically discloses the relationship among the basicity of solvents, solvent-contained intermediate structures, and intermediate-to-perovskite α-FAPbI 3 evolutions.
A predictive understanding of solvent effects on the perovskite formation is thus essential. Research on solvent chemistry, particularly for halide perovskite intermediates, has been advancing the development of perovskite solar cells (PSCs) toward commercial applications.
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