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One of the main challenges for perovskite solar cells (PSC) is theirstability, due to environment-induced perovskite decomposition. The resultingdecomposition compounds are mobile and may, therefore, react with chargecarrier extraction layers or the contact metallization, in addition toenhancing the recombination rate in the absorber layer. In this contribution,the influence of different contact metallization layers, such as aluminum (Al),silver (Ag), gold (Au) and nickel (Ni) on the storage stability of invertedplanar methylammonium lead iodide (MAPI)-based perovskite solar cells withoutencapsulation has been investigated. For this study current-voltage (J-V) andimpedance measurements in combination with scanning electron microscope (SEM)and Energy-dispersive X-ray spectroscopy (EDX) analysis were used to examineand correlate structural device information with the development of PSCelectrical properties. While a strong perovskite decomposition and furtheriodide diffusion to the contacts were detected for devices using Al, Ag or Auas cathode electrodes, the microstructure of Ni cathodes inhibits suchdecomposition process. This experiment has allowed for the realization of MAPIbased solar cells with Ni contacts, which exhibit no efficiency decrease belowas-fabricated values for up to one month of storage and select AM1.5 testing inambient atmosphere.

Influence of the Cathodes Microstructure on the Stability of Inverted Planar Perovskite Solar Cells