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Organic-Inorganic Perovskite Light-Emitting Electrochemical Cells with a Large Capacitance

机译：大容量有机-无机钙钛矿发光电化学电池

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摘要

While perovskite light-emitting diodes typically made with high work function anodes and low work function cathodes have recently gained intense interests. Perovskite light-emitting devices with two high work function electrodes with interesting features are demonstrated here. Firstly, electroluminescence can be easily obtained from both forward and reverse biases. Secondly, the results of impedance spectroscopy indicate that the ionic conductivity in the iodide perovskite (CH3 NH3PbI3) is large with a value of approximate to 10(-8) S cm(-1). Thirdly, the shift of the emission spectrum in the mixed halide perovskite (CH3NH3PbI3-Br-x(x)) light-emitting devices indicates that I(-)ions are mobile in the perovskites. Fourthly, this work shows that the accumulated ions at the interfaces result in a large capacitance (approximate to 100 mu F cm(-2)). The above results conclusively prove that the organic-inorganic halide perovskites are solid electrolytes with mixed ionic and electronic conductivity and the light-emitting device is a light-emitting electrochemical cell. The work also suggests that the organic-inorganic halide perovskites are potential energy-storage materials, which may be applicable in the field of solid-state supercapacitors and batteries.
机译：尽管通常由高功函数的阳极和低功函数的阴极制成的钙钛矿发光二极管近来引起了人们的强烈兴趣。本文展示了具有两个具有有趣功能的高功函数电极的钙钛矿发光器件。首先，可以容易地从正向和反向偏压获得电致发光。其次，阻抗谱的结果表明碘化物钙钛矿（CH3 NH3PbI3）中的离子电导率很大，其值约为10（-8）S cm（-1）。第三，在混合卤化物钙钛矿（CH3NH3PbI3-Br-x（x））发光器件中发射光谱的移动表明I（-）离子在钙钛矿中是可移动的。第四，这项工作表明，在界面处累积的离子会导致较大的电容（大约为100μF cm（-2））。以上结果最终证明有机-无机卤化物钙钛矿是具有混合的离子和电子导电性的固体电解质，并且发光器件是发光电化学电池。这项工作还表明，有机-无机卤化物钙钛矿是潜在的储能材料，可能适用于固态超级电容器和电池领域。

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  • 来源
    《Advanced Functional Materials》 |2015年第46期|7226-7232|共7页
  • 作者

    Zhang Huimin; Lin Hong; Liang Chunjun; Liu Hong; Liang Jingjing; Zhao Yong; Zhang Wenguan; Sun Mengjie; Xiao Weikang; Li Han; Polizzi Stefano; Li Dan; Zhang Fujun; He Zhiqun; Choy Wallace C. H.;

  • 作者单位

    Beijing Jiaotong Univ, Sch Sci, Key Lab Luminescence & Opt Informat, Minist Educ, Beijing 100044, Peoples R China;

    Univ Hong Kong, Dept Elect & Elect Engn, Hong Kong, Hong Kong, Peoples R China;

    Beijing Jiaotong Univ, Sch Sci, Key Lab Luminescence & Opt Informat, Minist Educ, Beijing 100044, Peoples R China;

    Beijing Jiaotong Univ, Sch Sci, Key Lab Luminescence & Opt Informat, Minist Educ, Beijing 100044, Peoples R China;

    Beijing Jiaotong Univ, Sch Sci, Key Lab Luminescence & Opt Informat, Minist Educ, Beijing 100044, Peoples R China;

    Beijing Jiaotong Univ, Sch Sci, Key Lab Luminescence & Opt Informat, Minist Educ, Beijing 100044, Peoples R China;

    Beijing Inst Graph Commun, Beijing Area Major Lab, Lab Printing & Packaging Mat & Technol, Beijing 102600, Peoples R China;

    Beijing Jiaotong Univ, Sch Sci, Key Lab Luminescence & Opt Informat, Minist Educ, Beijing 100044, Peoples R China;

    Beijing Jiaotong Univ, Sch Sci, Key Lab Luminescence & Opt Informat, Minist Educ, Beijing 100044, Peoples R China;

    Beijing Jiaotong Univ, Sch Sci, Key Lab Luminescence & Opt Informat, Minist Educ, Beijing 100044, Peoples R China;

    Univ Ca Foscari Venezia, Dept Mol Sci & Nanosyst, I-30172 Mestre Venezia, Italy;

    Beijing Jiaotong Univ, Sch Sci, Key Lab Luminescence & Opt Informat, Minist Educ, Beijing 100044, Peoples R China;

    Beijing Jiaotong Univ, Sch Sci, Key Lab Luminescence & Opt Informat, Minist Educ, Beijing 100044, Peoples R China;

    Beijing Jiaotong Univ, Sch Sci, Key Lab Luminescence & Opt Informat, Minist Educ, Beijing 100044, Peoples R China;

    Univ Hong Kong, Dept Elect & Elect Engn, Hong Kong, Hong Kong, Peoples R China;

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