Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 33, Issue 11, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202212606
Keywords
fluorine-rich complexes; hinge-type; interfaces; passivate; perovskite solar cells
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High density of defects at the interface greatly affects the performance of perovskite solar cells (PSCs). In this study, a hinge-type fluorine-rich complex, cobalt (II) hexafluoro-2,4-pentanedionate (CoFAc), is introduced onto the surface of formamidinium cesium lead iodide (FACsPbI(3)) film to address the issues related to the perovskite/Spiro-OMeTAD interface. CoFAc passivates vacancies in the organic cation and halide anion by forming strong hydrogen bonds with HC(NH2)(2)(+) (FA(+)) and strong ionic bonds with Pb2+ in the perovskite film. Additionally, CoFAc improves interfacial hole-transport kinetics by interacting with Spiro-OMeTAD. As a result, FACsPbI(3) PSCs with CoFAc modification demonstrate a record power conversion efficiency (PCE) of 24.64% and an impressive open-circuit voltage (V-OC) of 1.191 V, the highest reported V-OC among all organic-inorganic hybrid PSCs with TiO2 as the electron transport layer. Furthermore, CoFAc-modified devices exhibit exceptional long-term stability, retaining 95% of their initial PCE after exposure to ambient atmosphere for 1500 hours without any encapsulation.
High density of defects at interface severely affects the performance of perovskite solar cells (PSCs). Herein, cobalt (II) hexafluoro-2,4-pentanedionat (CoFAc), a hinge-type fluorine-rich complex, is introduced onto the surface of formamidinium cesium lead iodide (FACsPbI(3)) film to address the issues of perovskite/Spiro-OMeTAD interface. The existence of CoFAc passivates both organic cation and halide anion vacancies by establishing powerful hydrogen bonds with HC(NH2)(2)(+) (FA(+)) and strong ionic bonds with Pb2+ in perovskite films. In addition, CoFAc serves as a connecting link to enhance interfacial hole-transport kinetics via interacting with Spiro-OMeTAD. Consequently, FACsPbI(3) PSCs with CoFAc modification display a champion power conversion efficiency (PCE) of 24.64% with a charming open-circuit voltage (V-OC) of 1.191 V, which is the record V-OC among all the reported organic-inorganic hybrid PSCs with TiO2 as electron transport layer. Furthermore, CoFAc-modified devices exhibit an outstanding long-term stability, which can maintain 95% of their initial PCEs after exposure to ambient atmosphere for 1500 h without any encapsulation.
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