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Planar perovskite solar cells with long-term stability using ionic liquid additives

机译：使用离子液体添加剂的具有长期稳定性的平面钙钛矿太阳能电池

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摘要

Solar cells based on metal halide perovskites are one of the most promising photovoltaic technologies(1-4). Over the past few years, the long-term operational stability of such devices has been greatly improved by tuning the composition of the perovskites(5-9), optimizing the interfaces within the device structures(10-13), and using new encapsulation techniques(14,15). However, further improvements are required in order to deliver a longer-lasting technology. Ion migration in the perovskite active layer-especially under illumination and heat-is arguably the most difficult aspect to mitigate(16-18). Here we incorporate ionic liquids into the perovskite film and thence into positive-intrinsic-negative photovoltaic devices, increasing the device efficiency and markedly improving the long-term device stability. Specifically, we observe a degradation in performance of only around five per cent for the most stable encapsulated device under continuous simulated full-spectrum sunlight for more than 1,800 hours at 70 to 75 degrees Celsius, and estimate that the time required for the device to drop to eighty per cent of its peak performance is about 5,200 hours. Our demonstration of long-term operational, stable solar cells under intense conditions is a key step towards a reliable perovskite photovoltaic technology.
机译：基于金属卤化物钙钛矿的太阳能电池是最有前途的光伏技术之一（1-4）。在过去的几年中，通过调整钙钛矿的成分（5-9），优化设备结构内的界面（10-13）并使用新的封装技术，大大提高了此类设备的长期操作稳定性。 （14,15）。但是，为了提供更持久的技术，还需要进一步的改进。钙钛矿活性层中的离子迁移-特别是在光照和热量下-可以说是最难缓解的方面（16-18）。在这里，我们将离子液体掺入钙钛矿薄膜中，然后将其掺入正本征负光电器件中，从而提高了器件效率并显着提高了长期器件的稳定性。具体来说，我们观察到在70-75摄氏度下连续模拟全光谱阳光下超过1800小时，最稳定的封装设备的性能仅下降5％，并估计设备下降所需的时间其最高性能的百分之八十约为5200小时。我们在激烈条件下长期稳定运行的太阳能电池的演示是迈向可靠的钙钛矿光伏技术的关键一步。

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  • 来源
    《Nature》 |2019年第7764期|245-250|共6页
  • 作者

    Bai Sai; Da Peimei; Li Cheng; Wang Zhiping; Yuan Zhongcheng; Fu Fan; Kawecki Maciej; Liu Xianjie; Sakai Nobuya; Wang Jacob Tse-Wei; Huettner Sven; Buecheler Stephan; Fahlman Mats; Gao Feng; Snaith Henry J.;

  • 作者单位

    Univ Oxford, Clarendon Lab, Oxford, England|Linkoping Univ, Dept Phys Chem & Biol IFM, Linkoping, Sweden;

    Univ Oxford, Clarendon Lab, Oxford, England;

    Univ Bayreuth, Dept Chem, Bayreuth, Germany|Xiamen Univ, Sch Elect Sci & Engn, Xiamen, Fujian, Peoples R China;

    Univ Oxford, Clarendon Lab, Oxford, England;

    Linkoping Univ, Dept Phys Chem & Biol IFM, Linkoping, Sweden;

    Empa, Lab Nanoscale Mat Sci, Dubendorf, Switzerland|Univ Basel, Dept Phys, Basel, Switzerland;

    Linkoping Univ, Dept Phys Chem & Biol IFM, Linkoping, Sweden;

    Univ Oxford, Clarendon Lab, Oxford, England;

    CSIRO Energy, Mayfield West, NSW, Australia;

    Univ Bayreuth, Dept Chem, Bayreuth, Germany;

    Empa Swiss Fed Labs Mat Sci & Technol, Lab Thin Films & Photovolta, Dubendorf, Switzerland;

    Linkoping Univ, Dept Phys Chem & Biol IFM, Linkoping, Sweden;

    Univ Oxford, Clarendon Lab, Oxford, England|Linkoping Univ, Dept Phys Chem & Biol IFM, Linkoping, Sweden;

    Univ Oxford, Clarendon Lab, Oxford, England;

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