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A Polymerization‐Assisted Grain Growth Strategy for Efficient and Stable Perovskite Solar Cells
Author(s) -
Zhao Yepin,
Zhu Pengchen,
Wang Minhuan,
Huang Shu,
Zhao Zipeng,
Tan Shaun,
Han TaeHee,
Lee JinWook,
Huang Tianyi,
Wang Rui,
Xue Jingjing,
Meng Dong,
Huang Yu,
Marian Jaime,
Zhu Jia,
Yang Yang
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201907769
Subject(s) - passivation , materials science , grain boundary , polymer , polymerization , chemical engineering , perovskite (structure) , annealing (glass) , monomer , grain growth , grain size , energy conversion efficiency , nanotechnology , microstructure , metallurgy , composite material , optoelectronics , layer (electronics) , engineering
Intrinsically, detrimental defects accumulating at the surface and grain boundaries limit both the performance and stability of perovskite solar cells. Small molecules and bulkier polymers with functional groups are utilized to passivate these ionic defects but usually suffer from volatility and precipitation issues, respectively. Here, starting from the addition of small monomers in the PbI 2 precursor, a polymerization‐assisted grain growth strategy is introduced in the sequential deposition method. With a polymerization process triggered during the PbI 2 film annealing, the bulkier polymers formed will be adhered to the grain boundaries, retaining the previously established interactions with PbI 2 . After perovskite formation, the polymers anchored on the boundaries can effectively passivate undercoordinated lead ions and reduce the defect density. As a result, a champion power conversion efficiency (PCE) of 23.0% is obtained, together with a prolonged lifetime where 85.7% and 91.8% of the initial PCE remain after 504 h continuous illumination and 2208 h shelf storage, respectively.