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Article Dans Une Revue Journal of Materials Chemistry C Année : 2022

Ionic and Poly(ionic liquid)s as Perovskite Passivating Molecules for Improved Solar Cell Performances

Résumé

Perovskite solar cell devices have improved significantly in efficiency and are on the verge to commercialization. However, device stability has not yet been fully met. In this paper, we use a K +-doped formamidinium (FA)-based perovskite, which has been shown to be an ideal perovskite composition for fabricating efficient solar cells with low hysteresis and better stability compared to MA-free perovskite materials. Nevertheless, in order to further progress on the device's performance and stability, additives were employed. While in the literature different types of additives have been used, in particular ionic liquids (ILs) and polymers, the novelty of this work lies in the use of poly(ionic liquids) (PILs) as additives for the absorber layer, which have been used only recently as perovskite passivation agent. The PILs were chosen for their high ionic conductivity and their hydrophobic nature in a macromolecular structure. Here we show a direct comparison between the performances of devices obtained by adding a passivation IL (tBMPy-TFSI) and its polymeric version PIL (PVMPy-TFSI) in the perovskite layer. Preliminary studies show that the addition of both additives promotes improved solar cell performances and reduces the degradation rate during measurement. In particular, while the IL mainly induces higher solar cell performances due to the increase in VOC and FF, PIL promotes higher JSC, performance stability under illumination and significantly reduces the J-V hysteresis index, to approach 0% under AM1.5G illumination. Thus, both ILs and PILs are valuable passivation molecules for perovskite grain boundaries, promoting charge diffusion and protecting the perovskite layer from external agents that may induce degradation. We believe that PIL additives present attractive prospects for stable perovskite solar cell devices.
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Dates et versions

hal-03837650 , version 1 (03-11-2022)

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Silvia Mariotti, Daniele Mantione, Samy Almosni, Milutin Ivanović, Takeru Bessho, et al.. Ionic and Poly(ionic liquid)s as Perovskite Passivating Molecules for Improved Solar Cell Performances. Journal of Materials Chemistry C, 2022, ⟨10.1039/d2tc02633c⟩. ⟨hal-03837650⟩
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