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首页> 外文期刊>Advanced Materials >Compositional Control in 2D Perovskites with Alternating Cations in the Inter layer Space for Photovoltaics with Efficiency over 18%
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Compositional Control in 2D Perovskites with Alternating Cations in the Inter layer Space for Photovoltaics with Efficiency over 18%

机译：层间空间中具有交替阳离子的2D钙钛矿中的组分控制，其光伏效率超过18％

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摘要

2D perovskites stabilized by alternating cations in the interlayer space (ACI) represent a very new entry as highly efficient semiconductors for solar cells approaching 15% power conversion efficiency (PCE). However, further improvements will require understanding of the nature of the films, e.g., the thickness distribution and charge-transfer characteristics of ACI quantum wells (QWs), which are currently unknown. Here, efficient control of the film quality of ACI 2D perovskite (GA)(MA)(n)PbnI3n+1 (n = 3) QWs via incorporation of methylammonium chloride as an additive is demonstrated. The morphological and optoelectronic characterizations unambiguously demonstrate that the additive enables a larger grain size, a smoother surface, and a gradient distribution of QW thickness, which lead to enhanced photocurrent transport/extraction through efficient charge transfer between low-n and high-n QWs and suppressed nonradiative charge recombination. Therefore, the additive-treated ACI perovskite film delivers a champion PCE of 18.48%, far higher than the pristine one (15.79%) due to significant improvements in open-circuit voltage and fill factor. This PCE also stands as the highest value for all reported 2D perovskite solar cells based on the ACI, Ruddlesden-Popper, and Dion-Jacobson families. These findings establish the fundamental guidelines for the compositional control of 2D perovskites for efficient photovoltaics.
机译：通过层间空间（ACI）中的交替阳离子稳定的2D钙钛矿代表了一个非常新的领域，因为太阳能电池的高效半导体接近15％的功率转换效率（PCE）。但是，进一步的改进将需要了解薄膜的性质，例如，目前尚不知道的ACI量子阱（QW）的厚度分布和电荷转移特性。在此，通过加入甲基氯化铵作为添加剂，有效控制了ACI 2D钙钛矿（GA）（MA）（n）PbnI3n + 1（n = 3）QW的薄膜质量。形态和光电特性明确表明，该添加剂可实现更大的晶粒尺寸，更光滑的表面以及QW厚度的梯度分布，从而通过在低n和高n QW之间进行有效的电荷转移而增强了光电流的传输/提取。抑制非辐射电荷复合。因此，由于开路电压和填充系数的显着提高，经过添加剂处理的ACI钙钛矿薄膜可提供18.48％的冠军PCE，远高于原始的（15.79％）。对于所有报道的基于ACI，Ruddlesden-Popper和Dion-Jacobson系列的2D钙钛矿太阳能电池，该PCE也是最高值。这些发现为高效光伏技术的2D钙钛矿成分控制建立了基本准则。

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  • 来源
    《Advanced Materials》 |2019年第44期|1903848.1-1903848.8|共8页
  • 作者

    Luo Tao; Zhang Yalan; Xu Zhuo; Niu Tianqi; Wen Jialun; Lu Jing; Jin Shengye; Liu Shengzhong (Frank); Zhao Kui;

  • 作者单位

    Shaanxi Normal Univ Key Lab Appl Surface & Colloid Chem Shaanxi Key Lab Adv Energy Devices Minist Educ Xian 710119 Shaanxi Peoples R China|Shaanxi Normal Univ Shaanxi Engn Lab Adv Energy Technol Sch Mat Sci & Engn Xian 710119 Shaanxi Peoples R China;

    Chinese Acad Sci Dalian Natl Lab Clean Energy iChEM Dalian Inst Chem Phys Dalian 116023 Peoples R China;

    Shaanxi Normal Univ Key Lab Appl Surface & Colloid Chem Shaanxi Key Lab Adv Energy Devices Minist Educ Xian 710119 Shaanxi Peoples R China|Shaanxi Normal Univ Shaanxi Engn Lab Adv Energy Technol Sch Mat Sci & Engn Xian 710119 Shaanxi Peoples R China|Chinese Acad Sci Dalian Natl Lab Clean Energy iChEM Dalian Inst Chem Phys Dalian 116023 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    ACI perovskites; charge transport; quantum wells; solar cells;

    机译：ACI钙钛矿;收费运输;量子阱太阳能电池;

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