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首页> 外文期刊>Advanced Functional Materials >The Role of Chlorine in the Formation Process of 'CH_3NH_3Pbl_(3-x)Cl_x' Perovskite
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The Role of Chlorine in the Formation Process of 'CH_3NH_3Pbl_(3-x)Cl_x' Perovskite

机译：氯在“ CH_3NH_3Pbl_（3-x）Cl_x”钙钛矿形成过程中的作用

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摘要

CH_3NH_3Pbl_(3-x)Cl_x is a commonly used chemical formula to represent the methylammonium lead halide perovskite fabricated from mixed chlorine- and iodine-containing salt precursors. Despite the rapid progress in improving its photovoltaic efficiency, fundamental questions remain regarding the atomic ratio of Cl in the perovskite as well as the reaction mechanism that leads to its formation and crystallization. In this work we investigated these questions through a combination of chemical, morphological, structural and thermal characterizations. The elemental analyses reveal unambiguously the negligible amount of Cl atoms in the CH_3NH_3Pbl_(3-x)Cl_x perovskite. By studying the thermal characteristics of methylammonium halides as well as the annealing process in a polymer/perovskite/FTO glass structure, we show that the formation of the CH_3NH_3Pbl_(3-x)Cl_x perovskite is likely driven by release of gaseous CH_3NH_3Cl (or other organic chlorides) through an intermediate organometal mixed halide phase. Furthermore, the comparative study on CH_3NH_3I/PbCl_2 and CH_3NH_3I/Pbl_2 precursor combinations with different molar ratios suggest that the initial introduction of a CH_3NH_3~+ rich environment is critical to slow down the perovskite formation process and thus improve the growth of the crystal domains during annealing; accordingly, the function of Cl~- is to facilitate the release of excess CH_3NH_3~+ at a relatively low annealing temperatures.
机译：CH_3NH_3Pbl_（3-x）Cl_x是代表由混合的含氯和碘的盐前驱物制备的甲基铵卤化铅钙钛矿的常用化学式。尽管在提高其光电效率方面取得了迅速的进步，但是关于钙钛矿中Cl的原子比以及导致其形成和结晶的反应机理仍然存在基本问题。在这项工作中，我们通过化学，形态，结构和热学特征的组合研究了这些问题。元素分析清楚地揭示了CH_3NH_3Pbl_（3-x）Cl_x钙钛矿中Cl原子的数量可忽略不计。通过研究卤化甲基铵的热特性以及聚合物/钙钛矿/ FTO玻璃结构中的退火过程，我们表明CH_3NH_3Pbl_（3-x）Cl_x钙钛矿的形成可能是由气态CH_3NH_3Cl（或其他有机氯化物）通过中间有机金属混合卤化物相。此外，对具有不同摩尔比的CH_3NH_3I / PbCl_2和CH_3NH_3I / Pbl_2前驱体组合的比较研究表明，首先引入富含CH_3NH_3〜+的环境对于减缓钙钛矿的形成过程并因此改善晶体区的生长至关重要。退火;因此，Cl-的功能是促进在相对较低的退火温度下释放过量的CH 3 NH 3-+。

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  • 来源
    《Advanced Functional Materials》 |2014年第45期|7102-7108|共7页
  • 作者

    Hui Yu; Feng Wang; Fangyan Xie; Wenwu Li; Jian Chen; Ni Zhao;

  • 作者单位

    Department of Electronic Engineering The Chinese University of Hong Kong New Territories, Hong Kong;

    Department of Electronic Engineering The Chinese University of Hong Kong New Territories, Hong Kong;

    Instrumental Analysis and Research Center Sun Yat-sen University Guangzhou 510275, P. R. China;

    Department of Electronic Engineering The Chinese University of Hong Kong New Territories, Hong Kong;

    Instrumental Analysis and Research Center Sun Yat-sen University Guangzhou 510275, P. R. China;

    Department of Electronic Engineering The Chinese University of Hong Kong New Territories, Hong Kong;

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