Date Published: January 21, 2019
Publisher: John Wiley and Sons Inc.
Author(s): Xiaoxia Feng, Ruihao Chen, Zi‐Ang Nan, Xudong Lv, Ruiqian Meng, Jing Cao, Yu Tang.
The formation of defects at surfaces and grain boundaries (GBs) during the fabrication of solution‐processed perovskite film are thought to be responsible for its instability. Herein, Eu‐porphyrin complex (Eu‐pyP) is directly doped into methylammonium lead triiodide (MAPbI3) precursor, perfectly fabricating 2D (Eu‐pyP)0.5MAn‐1PbnI3n+1 platelets inlaying the GBs of 3D polycrystalline interstices in this protocol. The device based on Eu‐pyP doped perovskite film possesses a champion efficiency of 18.2%. More importantly, the doped perovskite solar cells device shows beyond 85% retention of its pristine efficiency value, whereas the pure MAPbI3 device has a rapid drop in efficiency down to 10% within 100 h under 45% humidity at 85 °C in AM 1.5 G. The above acquired perovskite films reveal an unpredictable thermodynamic self‐healing ability. Consequently, the findings provide an avenue for defect passivation to synchronously improve resistibility to moisture, heat, and solar light including UV.
Materials: All solvents and starting chemicals were of commercially analytical grade and used without further purification unless otherwise noted. The MAI synthesized and purified according to the literature reported.52 The detailed synthetic procedures of Eu‐pyP and pyP were presented in Scheme S1 of the Supporting Information.
The authors declare no conflict of interest.