材料科学
钙钛矿(结构)
单层
光伏
结晶度
自组装单层膜
纳米技术
氧化铟锡
氧化锡
光伏系统
光电子学
化学工程
薄膜
兴奋剂
工程类
生态学
复合材料
生物
作者
Z. L. Zhang,Rui Zhu,Ying Tang,Zhenhuang Su,Shuaifeng Hu,Zhuo Xu,Junhan Zhang,Jinbo Zhao,Yanjun Xue,Xinyu Gao,Guixiang Li,Jorge Pascual,Antonio Abate,Meng Li
标识
DOI:10.1002/adma.202312264
摘要
Abstract Self‐assembled monolayers (SAMs) have displayed great potential for improving efficiency and stability in p–i–n perovskite solar cells (PSCs). The anchoring of SAMs at the conductiv metal oxide substrates and their interaction with perovskite materials must be rationally tailored to ensure efficient charge carrier extraction and improved quality of the perovskite films. Herein, SAMs molecules with different anchoring groups and spacers to control the interaction with perovskite in the p–i–n mixed Sn–Pb PSCs are selected. It is found that the monolayer with the carboxylate group exhibits appropriate interaction and has a more favorable orientation and arrangement than that of the phosphate group. This results in reduced nonradiative recombination and enhanced crystallinity. In addition, the short chain length leads to an improved energy level alignment of SAMs with perovskite, improving hole extraction. As a result, the narrow bandgap (≈1.25 eV) Sn–Pb PSCs show efficiencies of up to 23.1% with an open‐circuit voltage of up to 0.89 V. Unencapsulated devices retain 93% of their initial efficiency after storage in N 2 atmosphere for over 2500 h. Overall, this work highlights the underexplored potential of SAMs for perovskite photovoltaics and provides essential findings on the influence of their structural modification.
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