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Enhanced Hole Transportation for Inverted Tin-Based Perovskite Solar Cells with High Performance and Stability

机译：高性能和高稳定性的倒装锡基钙钛矿太阳能电池的空穴传输增强。

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摘要

High electronic quality perovskite films with a balanced charge transportation is critical for satisfying high-performance for perovskite solar cells (PVSCs). However, the inferior band alignment of tin-based perovskite films with an adjacent hole-transport layer (HTL) leads to a poor hole transportation and collection. In this work, the semiconducting molecule poly[tetraphenylethene 3,3-(((2,2-diphenylethene-1,1-diyl)bis(4,1-phenylene))bis(oxy))bis(N,N-dimethylpropan-1-amine)tetraphenylethene] (PTN-Br) is introduced into a lead-free perovskite precursor to form a bulk heterojunction film. In addition, the PTN-Br molecule with the suitable highest occupied molecular orbital energy level (-5.41 eV) can fill into the grain boundaries of the perovskite film, serving as a hole-transport medium between grains. The gradient band alignment of the perovskite film with poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) HTL ensures excellent hole transportation and higher open-circuit voltage. In addition, the -conjugated polymer PTN-Br can passivate trap states within the perovskite film due to the formation of Lewis adducts between uncoordinated Sn atoms and the dimethylamino of PTN-Br. Consequently, a champion efficiency of 7.94% is achieved with significant enhancements in the open-circuit voltage and fill factor. Furthermore, the PTN-Br incorporated device shows better ultra violet (UV) stability because of the UV barrier and passivating effect of PTN-Br, retaining about 66% of its initial efficiency after 5 h of continuous UV light irradiation.
机译：具有平衡电荷传输的高电子品质钙钛矿薄膜对于满足钙钛矿太阳能电池（PVSC）的高性能至关重要。但是，锡基钙钛矿薄膜与相邻的空穴传输层（HTL）的较差的带取向导致不良的空穴传输和收集。在这项工作中，半导体分子聚[四苯乙烯3,3-（（（（2,2-二苯乙烯-1,1-二基）双（4,1-亚苯基））双（氧））双（N，N-二甲基丙烷）将[-1-胺）四苯基乙烯]（PTN-Br）引入无铅钙钛矿前体中，以形成体异质结薄膜。此外，具有合适的最高占据分子轨道能级（-5.41 eV）的PTN-Br分子可以填充钙钛矿薄膜的晶界，作为晶粒之间的空穴传输介质。钙钛矿薄膜与聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT：PSS）HTL的梯度带取向可确保出色的空穴传输和更高的开路电压。另外，由于在未配位的Sn原子和PTN-Br的二甲基氨基之间形成路易斯加合物，所以共轭聚合物PTN-Br可钝化钙钛矿膜内的陷阱态。因此，通过显着提高开路电压和填充系数，可以达到7.94％的最佳效率。此外，由于PTN-Br的紫外线阻隔和钝化效果，并入PTN-Br的装置显示出更好的紫外线（UV）稳定性，连续5h的紫外线照射后，其保持约66％的初始效率。

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  • 来源
    《Advanced Functional Materials》 |2019年第18期|1808059.1-1808059.9|共9页
  • 作者

    Liu Cong; Tu Jin; Hu Xiaotian; Huang Zengqi; Meng Xiangchuan; Yang Jia; Duan Xiaopeng; Tan Licheng; Li Zhen; Chen Yiwang;

  • 作者单位

    Nanchang Univ, IPEC, Coll Chem, 999 Xuefu Ave, Nanchang 330031, Jiangxi, Peoples R China;

    Wuhan Univ, Dept Chem, Wuhan 430072, Hubei, Peoples R China;

    ICCAS, Key Lab Green Printing, 2 Zhongguancun Beiyi St, Beijing 100190, Peoples R China;

    Nanchang Univ, IPEC, Coll Chem, 999 Xuefu Ave, Nanchang 330031, Jiangxi, Peoples R China;

    Nanchang Univ, IPEC, Coll Chem, 999 Xuefu Ave, Nanchang 330031, Jiangxi, Peoples R China;

    Nanchang Univ, IPEC, Coll Chem, 999 Xuefu Ave, Nanchang 330031, Jiangxi, Peoples R China;

    Nanchang Univ, IPEC, Coll Chem, 999 Xuefu Ave, Nanchang 330031, Jiangxi, Peoples R China;

    Nanchang Univ, IPEC, Coll Chem, 999 Xuefu Ave, Nanchang 330031, Jiangxi, Peoples R China;

    Wuhan Univ, Dept Chem, Wuhan 430072, Hubei, Peoples R China|Tianjin Univ, Inst Mol Aggregat Sci, Tianjin 300072, Peoples R China;

    Nanchang Univ, IPEC, Coll Chem, 999 Xuefu Ave, Nanchang 330031, Jiangxi, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    gradient band alignment; hole transportation; lead-free; Lewis adducts; UV stability;

    机译：梯度带取向;空穴传输;无铅;路易斯加合物;紫外稳定性;

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