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    Boosting perovskite nanomorphology and charge transport properties via a functional D-pi-A organic layer at the absorber/hole transporter interface

    Year: 2020

    Journal: Nanoscale, Volume 12, JUL 28, page 15137–15149

    Authors: Elsenety, Mohamed M.; Stergiou, Anastasios; Sygellou, Labrini; Tagmatarchis, Nikos; Balis, Nikolaos; Falaras, Polycarpos

    Organizations: European Union's Horizon 2020 Marie Curie Innovative Training Network [764787]; Greek Ministry of Foreign Affairs; Egyptian Government

    The photovoltaic efficiency and stability challenges encountered in perovskite solar cells (PSCs) were addressed by an innovative interface engineering approach involving the utilization of the organic chromophore (E)-3-(5-(4-(bis(2 ',4 '-dibutoxy-[1,1 '-biphenyl]-4-yl)amino)phenyl)thiophen-2-yl)-2-cyanoacrylic acid (D35) as an interlayer between the perovskite absorber and the hole transporter (HTM) of mesoporous PSCs. The organic D-pi-A interlayer primarily improves the perovskite's crystallinity and creates a smoother perovskite/HTM interface, while reducing the grain boundary defects and inducing an energy level alignment with the adjacent layers. Champion power conversion efficiencies (PCE) as high as 18.5% were obtained, clearly outperforming the reference devices. Interestingly, the D35-based solar cells present superior stability since they preserved 83% of their initial efficiency after 37 days of storage under dark and open circuit (OC) conditions. The obtained results consolidate the multifunctional role of organic D-pi-A molecules as perovskite interface modifiers towards performance enhancement and scale-up fabrication of robust PSCs.
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