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Passivated Perovskite Crystallization via g-C_3N_4 for High-Performance Solar Cells

机译：通过g-C_3N_4钝化钙钛矿结晶，用于高性能太阳能电池

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摘要

Organometallic halide perovskite films with good surface morphology and large grain size are desirable for obtaining high-performance photovoltaic devices. However, defects and related trap sites are generated inevitably at grain boundaries and on surfaces of solution-processed polycrystalline perovskite films. Seeking facial and efficient methods to passivate the perovskite film for minimizing defect density is necessary for further improving the photovoltaic performance. Here, a convenient strategy is developed to improve perovskite crystallization by incorporating a 2D polymeric material of graphitic carbon nitride (g-C3N4) into the perovskite layer. The addition of g-C3N4 results in improved crystalline quality of perovskite film with large grain size by retarding the crystallization rate, and reduced intrinsic defect density by passivating charge recombination centers around the grain boundaries. In addition, g-C3N4 doping increases the film conductivity of perovskite layer, which is beneficial for charge transport in perovskite light-absorption layer. Consequently, a champion device with a maximum power conversion efficiency of 19.49% is approached owing to a remarkable improvement in fill factor from 0.65 to 0.74. This finding demonstrates a simple method to passivate the perovskite film by controlling the crystallization and reducing the defect density.
机译：具有良好的表面形态和大晶粒尺寸的有机金属卤化物钙钛矿膜对于获得高性能的光伏器件是理想的。但是，在固溶处理的多晶钙钛矿膜的晶界和表面不可避免地产生缺陷和相关的陷阱位点。寻找面部和有效的方法来钝化钙钛矿膜以最小化缺陷密度对于进一步提高光伏性能是必要的。在这里，开发了一种方便的策略，可以通过将石墨化碳氮化物（g-C3N4）的2D聚合材料掺入钙钛矿层来改善钙钛矿的结晶。 g-C3N4的添加可通过延迟结晶速率来提高具有大晶粒尺寸的钙钛矿薄膜的晶体质量，并通过钝化晶界周围的电荷复合中心来降低固有缺陷密度。另外，g-C3N4掺杂增加了钙钛矿层的膜电导率，这对于钙钛矿光吸收层中的电荷传输是有利的。因此，由于填充因数从0.65显着提高到0.74，因此具有最高功率转换效率为19.49％的冠军器件已经问世。该发现证明了通过控制结晶并降低缺陷密度来钝化钙钛矿膜的简单方法。

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  • 来源
    《Advanced Functional Materials》 |2018年第7期|43-50|共8页
  • 作者

    Jiang Lu-Lu; Wang Zhao-Kui; Li Meng; Zhang Cong-Cong; Ye Qing-Qing; Hu Ke-Hao; Lu Ding-Ze; Fang Peng-Fei; Liao Liang-Sheng;

  • 作者单位

    Soochow Univ, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Inst Funct Nano & Soft Mat FUNSOM, Suzhou 215123, Peoples R China;

    Soochow Univ, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Inst Funct Nano & Soft Mat FUNSOM, Suzhou 215123, Peoples R China;

    Soochow Univ, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Inst Funct Nano & Soft Mat FUNSOM, Suzhou 215123, Peoples R China;

    Soochow Univ, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Inst Funct Nano & Soft Mat FUNSOM, Suzhou 215123, Peoples R China;

    Soochow Univ, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Inst Funct Nano & Soft Mat FUNSOM, Suzhou 215123, Peoples R China;

    Wuhan Univ, Minist Educ, Dept Phys, Wuhan 430072, Hubei, Peoples R China;

    Wuhan Univ, Minist Educ, Dept Phys, Wuhan 430072, Hubei, Peoples R China;

    Soochow Univ, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Inst Funct Nano & Soft Mat FUNSOM, Suzhou 215123, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    perovskite crystallization; perovskite solar cells; passivation;

    机译：钙钛矿结晶;钙钛矿太阳能电池;钝化;

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