An Universal Multi-Additive Strategy to Enhance Efficiency and Stability in Inverted Perovskite Solar Cells

Luigi Angelo Castriotta, Emanuele Calabrò, Francesco Di Giacomo, Sathy
Harshavardhan Reddy, Daimiota Takhellambam, Barbara Paci, Amanda Generosi,
Luca Serenelli, Francesca Menchini, Luca Martini, Mario Tucci, Aldo Di Carlo

Abstract:

Perovskite solar technology has become a trend topic in the last decade, reaching promising efficiencies up to 25.7%. Researchers mainly focused on obtaining high performances rather than caring for stability under accelerated stress condition, such as thermal and light soaking tests. For this reason, we studied a standard triple cation perovskite (~1.58eV) and wider bandgap perovskite (~1.63eV) with the scope of finding a common strategy to build a robust device stable over time independently of the perovskite used. We use a combination of additives inside the perovskite ink: ionic liquids 1-Butyl-3-methylimidazolium tetrafluoroborate (BMIM-BF4), alkylamine ligands oleylamine (OAm) and benzylhydrazine hydrochloride (BHC). Our work reveals that the combination of these additives helps to improve efficiency and stability of the entire device, reaching a power conversion efficiency of over 20% on both types of perovskite and stability beyond 1000 hours under continuous light-soaking. The universal applicability of this method further applied to a more robust methylammonium free perovskite leading to an impressive stability both under light soaking and under 85°C, showing T 90 > 1500 hours and T 80 > 8658 hours, respectively.

 

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