Recovering Quadruple-cation Perovskite Films from Water Caused Permanent Degradations

Abstract

To promote the stability and efficiency, quadruple-cation perovskite system (blending of MA, FA, Cs, I, Br, etc) was introduced to substitute the traditional MAPbI₃ perovskite. Perovskite films degraded by water can be recovered by a simple method. The PbI₂ residues decomposed from perovskite were transformed into perovskite again, which gave rise to remarkably boosted optical properties, drastically improved film morphology and largely suppressed pinholes. The efficiency of the repairing method was testified by fieldemission scanning electron microscopy, atomic force microscopy, X-ray photoelectron spectroscopy, and so on. The power conversion efficiency of fixed perovskite solar cells improved from around 3% to 15.78% (0.16 cm₂, mask area), and 12.56% at area of 1 cm₂, which prove that this method is very effective.

Keywords

quadruple-cation / perovskite solar cells / repair

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