Stabilized perovskite ink for scalable coating enables high-efficiency perovskite modules

Perovskite inks play critical roles in determining film quality and device performance, and ink stability is desired to ensure high device reproducibility. Here, we reveal the instability issue of current cesium-formamidinium lead triiodide (Cs x FA 1− x PbI 3 ) inks whose aggregation and precipitation tendencies are induced by excessively strong solvent-lead-halide coordination. By modulating coordination strength between precursor salts and solvents, we identify solvent coordination-dispersion equilibrium as the governing factor for ink stability and develop a stable ink that exhibits a remarkable increase in the shelf life. It effectively tunes ink drying and film crystallization, resulting in blade-coated…

• UR
  UK Research and Innovation

  Award: SEALPTSC, EP/Y029216/1
• NN
  National Natural Science Foundation of China

  Award: 52372196
• EA
  Engineering and Physical Sciences Research Council