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首页> 外文期刊>Advanced Materials >Synergistic Effect of Elevated Device Temperature and Excess Charge Carriers on the Rapid Light-Induced Degradation of Perovskite Solar Cells
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Synergistic Effect of Elevated Device Temperature and Excess Charge Carriers on the Rapid Light-Induced Degradation of Perovskite Solar Cells

机译：器件温度升高和电荷载流子对钙钛矿太阳能电池快速光致降解的协同效应

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摘要

With power conversion efficiencies now reaching 24.2%, the major factor limiting efficient electricity generation using perovskite solar cells (PSCs) is their long-term stability. In particular, PSCs have demonstrated rapid degradation under illumination, the driving mechanism of which is yet to be understood. It is shown that elevated device temperature coupled with excess charge carriers due to constant illumination is the dominant force in the rapid degradation of encapsulated perovskite solar cells under illumination. Cooling the device to 20 degrees C and operating at the maximum power point improves the stability of CH3NH3PbI3 solar cells over 100x compared to operation under open circuit conditions at 60 degrees C. Light-induced strain originating from photothermal-induced expansion is also observed in CH3NH3PbI3, which excludes other light-induced-strain mechanisms. However, strain and electric field do not appear to play any role in the initial rapid degradation of CH3NH3PbI3 solar cells under illumination. It is revealed that the formation of additional recombination centers in PSCs facilitated by elevated temperature and excess charge carriers ultimately results in rapid light-induced degradation. Guidance on the best methods for measuring the stability of PSCs is also given.
机译：目前，功率转换效率达到24.2％，限制钙钛矿型太阳能电池（PSC）高效发电的主要因素是其长期稳定性。特别是，PSC已证明在光照下会迅速降解，其驱动机理尚待了解。结果表明，由于恒定的照明而导致的器件温度升高与过量的电荷载流子相结合，是封装的钙钛矿型太阳能电池在照明下迅速降解的主要力量。与在60摄氏度的开路条件下运行相比，将设备冷却至20摄氏度并在最大功率点下运行可将CH3NH3PbI3太阳能电池的稳定性提高100倍以上。 ，不包括其他光致应变机制。但是，在光照下，CH3NH3PbI3太阳能电池的初始快速降解中，应变和电场似乎没有任何作用。揭示了在PSC中额外的重组中心的形成由于升高的温度而促进，过量的电荷载流子最终导致快速的光诱导降解。还给出了用于测量PSC稳定性的最佳方法的指南。

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  • 来源
    《Advanced Materials》 |2019年第35期|1902413.1-1902413.8|共8页
  • 作者

    Chen Bo; Song Jingfeng; Dai Xuezeng; Liu Ye; Rudd Peter N.; Hong Xia; Huang Jinsong;

  • 作者单位

    Univ N Carolina, Dept Appl Phys Sci, Chapel Hill, NC 27599 USA;

    Univ Nebraska Lincoln, Dept Phys & Astron, Lincoln, NE 68588 USA|Univ Nebraska Lincoln, Nebraska Ctr Mat & Nanosci, Lincoln, NE 68588 USA;

    Univ N Carolina, Dept Appl Phys Sci, Chapel Hill, NC 27599 USA;

    Univ Nebraska Lincoln, Dept Mech & Mat Engn, Lincoln, NE 68588 USA;

    Univ N Carolina, Dept Appl Phys Sci, Chapel Hill, NC 27599 USA;

    Univ Nebraska Lincoln, Dept Phys & Astron, Lincoln, NE 68588 USA|Univ Nebraska Lincoln, Nebraska Ctr Mat & Nanosci, Lincoln, NE 68588 USA;

    Univ N Carolina, Dept Appl Phys Sci, Chapel Hill, NC 27599 USA|Univ Nebraska Lincoln, Dept Mech & Mat Engn, Lincoln, NE 68588 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    energy generation; light-induced degradation; perovskite solar cells;

    机译：能量产生;光引起的降解;钙钛矿太阳能电池;

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