Multilayered Perovskite Materials Based on Polymeric-Ammonium Cations for Stable Large-Area Solar Cell

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• 作者：Kai Yao ; Xiaofeng Wang ; Yun-xiang Xu ; Fan Li ; Lang Zhou
• 刊名：Chemistry of Materials
• 出版年：2016
• 出版时间：May 10, 2016
• 年：2016
• 卷：28
• 期：9
• 页码：3131-3138
• 全文大小：588K
• 年卷期：0
• ISSN：1520-5002

文摘

Despite the dramatic rise in power conversion efficiencies (PCEs) of perovskite solar cells (PeSCs), concerns surrounding the long-term stability as well as the poor reproducibility in the archetypal three-dimensional (3D) perovskite, MAPbI₃ (MA = CH₃NH₃), have the potential to derail commercialization. We have reported the fabrication and properties of a series of 2D perovskite compounds (PEI)₂(MA)_n−1Pb_nI_3n+1 (n = 3, 5, 7) by incorporating polyethylenimine (PEI) cations within the layered structure. The benefits of using intercalated polymer cations in the multilayered films are multiple: moisture resistance and film quality are greatly enhanced compared to that of their 3D MAPbI₃ analogue; charge transport within solar cells can also be improved compared to that of 2D materials using small-molecule bulky ammonium. The moisture-stable nature of the multilayered perovskite materials allow for the simple one-step fabrication of cells with an aperture area of 2.32 cm² under ambient humidity that have a PCE up to 8.77%. Overall, the 2D perovskite family offers rich multitudes of substituent and crystal structures, defining a promising class of stable and efficient light-absorbing materials.