钝化
材料科学
晶界
聚合物
钙钛矿(结构)
聚合
化学工程
退火(玻璃)
晶粒生长
粒度
单体
能量转换效率
纳米技术
微观结构
复合材料
冶金
光电子学
图层(电子)
工程类
作者
Yepin Zhao,Pengchen Zhu,Minhuan Wang,Shu-Chuan Huang,Zipeng Zhao,Shaun Tan,Tae Hee Han,Jin Wook Lee,Tianyi Huang,Rui Wang,Jingjing Xue,Dong Meng,Yu Huang,Jaime Marian,Jing Zhu,Yang Yang
标识
DOI:10.1002/adma.201907769
摘要
Abstract 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.
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