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Alkali Chlorides for the Suppression of the Interfacial Recombination in Inverted Planar Perovskite Solar Cells

机译：用于抑制倒置平面钙钛矿太阳能电池中界面重组的碱氯化物

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摘要

In this work, significant suppression of the interfacial recombination by facile alkali chloride interface modification of the NiOx hole transport layer in inverted planar perovskite solar cells is achieved. Experimental and theoretical results reveal that the alkali chloride interface modification results in improved ordering of the perovskite films, which in turn reduces defect/trap density, causing reduced interfacial recombination. This leads to a significant improvement in the open-circuit voltage from 1.07 eV for pristine NiOx to 1.15 eV for KCl-treated NiOx, resulting in a power conversion efficiency approaching 21%. Furthermore, the suppression of the ion diffusion in the devices is observed, as evidenced by stable photoluminescence (PL) under illumination and high PL quantum efficiency with alkali chloride treatment, as opposed to the luminescence enhancement and low PL quantum efficiency observed for perovskite on pristine NiOx. The suppressed ion diffusion is also consistent with improved stability of the devices with KCl-treated NiOx. Thus, it is demonstrated that a simple interfacial modification is an effective method to not only suppress interfacial recombination but also to suppress ion migration in the layers deposited on the modified interface due to improved interface ordering and reduced defect density.
机译：在这项工作中，实现了通过倒置平面钙钛矿太阳能电池中的NiOx空穴传输层的体内碱氯化物界面改性的界面重组的显着抑制。实验性和理论结果表明，碱氯化物界面改性导致钙钛矿膜的改善排序，这反过来降低缺陷/陷阱密度，导致界面重组降低。这导致从1.07eV的开路电压为原始NIOx到1.15eV的开路电压的显着改善，用于KCL处理的NIOx，导致电力转换效率接近21％。此外，观察到抑制装置中的离子扩散，如在照明和高PL量子效率下通过碱氯化物处理的稳定光致发光（PL）所证明的，而不是在原始的钙钛矿中观察到的发光增强和低PL量子效率niox。抑制的离子扩散也与具有KCl处理的NiOx的装置的稳定性提高。因此，证明简单的界面修饰是不仅抑制界面重组的有效方法，而且还具有由于改进的界面排序和降低的缺陷密度而抑制沉积在改进界面上的层中的离子迁移。

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  • 来源
    《Advanced energy materials》 |2019年第19期|1803872.1-1803872.10|共10页
  • 作者

    Chen Wei; Zhou Yecheng; Chen Guocong; Wu Yinghui; Tu Bao; Liu Fang-Zhou; Huang Li; Ng Alan Man Ching; Djurisic Aleksandra B.; He Zhubing;

  • 作者单位

    Southern Univ Sci & Technol Shenzhen Key Lab Full Spectral Solar Elect Genera Dept Mat Sci & Engn 1088 Xueyuan Rd Shenzhen 518055 Guangdong Peoples R China|Univ Hong Kong Dept Phys Pokfulam Hong Kong Peoples R China;

    Southern Univ Sci & Technol China Dept Phys Shenzhen 518055 Peoples R China;

    Southern Univ Sci & Technol Shenzhen Key Lab Full Spectral Solar Elect Genera Dept Mat Sci & Engn 1088 Xueyuan Rd Shenzhen 518055 Guangdong Peoples R China;

    Southern Univ Sci & Technol Shenzhen Key Lab Full Spectral Solar Elect Genera Dept Mat Sci & Engn 1088 Xueyuan Rd Shenzhen 518055 Guangdong Peoples R China;

    Southern Univ Sci & Technol Shenzhen Key Lab Full Spectral Solar Elect Genera Dept Mat Sci & Engn 1088 Xueyuan Rd Shenzhen 518055 Guangdong Peoples R China;

    Univ Hong Kong Dept Phys Pokfulam Hong Kong Peoples R China;

    Southern Univ Sci & Technol China Dept Phys Shenzhen 518055 Peoples R China;

    Southern Univ Sci & Technol China Dept Phys Shenzhen 518055 Peoples R China;

    Univ Hong Kong Dept Phys Pokfulam Hong Kong Peoples R China;

    Southern Univ Sci & Technol Shenzhen Key Lab Full Spectral Solar Elect Genera Dept Mat Sci & Engn 1088 Xueyuan Rd Shenzhen 518055 Guangdong Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    alkali chlorides; halide perovskites; interfacial recombination; nickel oxide;

    机译：碱氯化物;卤化物钙钛矿;界面重组;氧化镍;

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