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首页> 外文期刊>Advanced Functional Materials >Unveiling a Key Intermediate in Solvent Vapor Postannealing to Enlarge Crystalline Domains of Organometal Halide Perovskite Films
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Unveiling a Key Intermediate in Solvent Vapor Postannealing to Enlarge Crystalline Domains of Organometal Halide Perovskite Films

机译：揭露溶剂蒸汽后退火中的关键中间体，以扩大有机金属卤化物钙钛矿薄膜的晶畴。

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摘要

Hybrid organic/inorganic perovskite solar cells (PSCs) have shown great potential in meeting the future challenges in energy and environment. Solvent-vapor-assisted posttreatment strategies are developed to improve the perovskite film quality for achieving higher efficiency. However, the intrinsic working mechanisms of these strategies have not been well understood yet. This study identifies an MA(2)Pb(3)I(8)(DMSO)(2) intermediate phase formed during the annealing process of methylammonium lead triiodide in dimethyl sulfoxide (DMSO) atmosphere and located the reaction sites at perovskite grain boundaries by observing and rationalizing the growth of nanorods of the intermediate. This enables us to propose and validate an intermediate-assisted grain-coarsening model, which highlights the activation energy reduction for grain boundary migration. Leveraging this mechanism, this study uses MABr/DMSO mixed vapor to further enhance grain boundary migration kinetics and successfully obtain even larger grains, leading to an impressive improvement in power conversion efficiency (17.64%) relative to the pristine PSCs (15.13%). The revelation of grain boundary migration-assisted grain growth provides a guide for the future development of polycrystalline perovskite thin-film solar cells.
机译：混合的有机/无机钙钛矿太阳能电池（PSC）在满足未来能源和环境挑战方面显示出巨大潜力。开发了溶剂蒸气辅助的后处理策略，以改善钙钛矿薄膜的质量，以实现更高的效率。但是，这些策略的内在工作机制尚未得到很好的理解。这项研究确定了在二甲基亚砜（DMSO）气氛中的甲基碘化三碘化铅退火过程中形成的MA（2）Pb（3）I（8）（DMSO）（2）中间相，并将反应位点定位在钙钛矿晶界上观察并合理化中间体纳米棒的生长。这使我们能够提出并验证一种中间辅助的晶粒粗化模型，该模型强调了晶界迁移的活化能降低。利用这种机制，本研究使用MABr / DMSO混合蒸气进一步增强了晶界迁移动力学，并成功获得了更大的晶粒，相对于原始PSC（15.13％），功率转换效率（17.64％）得到了显着提高。晶界迁移辅助晶粒生长的启示为未来多晶钙钛矿薄膜太阳能电池的发展提供了指导。

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  • 来源
    《Advanced Functional Materials》 |2017年第12期|1604944.1-1604944.7|共7页
  • 作者

    Xiao Shuang; Bai Yang; Meng Xiangyue; Zhang Teng; Chen Haining; Zheng Xiaoli; Hu Chen; Qu Yongquan; Yang Shihe;

  • 作者单位

    Hong Kong Univ Sci & Technol, Dept Chem, Clear Water Bay, Hong Kong 999077, Hong Kong, Peoples R China|Xi An Jiao Tong Univ, Joint Sch Sustainable Dev, 99 Yan Xiang Rd, Xian, Peoples R China|Xi An Jiao Tong Univ, Frontier Inst Sci & Technol, 99 Yan Xiang Rd, Xian, Peoples R China;

    Hong Kong Univ Sci & Technol, Dept Chem, Clear Water Bay, Hong Kong 999077, Hong Kong, Peoples R China;

    Hong Kong Univ Sci & Technol, Dept Chem, Clear Water Bay, Hong Kong 999077, Hong Kong, Peoples R China;

    Hong Kong Univ Sci & Technol, Dept Chem, Clear Water Bay, Hong Kong 999077, Hong Kong, Peoples R China;

    Hong Kong Univ Sci & Technol, Dept Chem, Clear Water Bay, Hong Kong 999077, Hong Kong, Peoples R China;

    Beihang Univ, Sch Mat Sci & Engn, 37 Xue Yuan Rd, Beijing, Peoples R China;

    Xi An Jiao Tong Univ, Joint Sch Sustainable Dev, 99 Yan Xiang Rd, Xian, Peoples R China|Xi An Jiao Tong Univ, Frontier Inst Sci & Technol, 99 Yan Xiang Rd, Xian, Peoples R China;

    Hong Kong Univ Sci & Technol, Dept Chem, Clear Water Bay, Hong Kong 999077, Hong Kong, Peoples R China;

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