Interfacial Modification Engineering with Cs 3 Cu 2 I 5 Nanocrystals for Efficient and Stable Perovskite Solar Cells
Interfacial Modification Engineering with Cs 3 Cu 2 I 5 Nanocrystals for Efficient and Stable Perovskite Solar Cells
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Cs 3 Cu 2 I 5 纳米晶的界面改性工程用于高效稳定的钙钛矿太阳能电池
DOI：
10.1002/solr.202200025
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发表时间：
2022
期刊：
影响因子：
7.9
通讯作者：
Hongwei Song
中科院分区：
文献类型：
--
作者：
Le Liu;Donglei Zhou;Lu Zi;Rui Sun;Shuainan Liu;Bin Liu;Zhichong Shi;Dali Liu;Hongwei Song
钙钛矿薄膜表面和晶界的离子缺陷是影响有机-无机杂化钙钛矿太阳能电池（PSC）能量转换效率（PCE）的重要因素。虽然人们提出了各种方法来解决这些问题，但由于这些缺陷的复杂性和多样性，仍然是一个巨大的挑战。本文提出了一种改进方法，即引入全无机低维卤化铯铜纳米晶（Cs3 Cu 2 I5 NCs）来减少钙钛矿薄膜表面的离子缺陷和晶界缺陷。冠军器件经Cs3 Cu 2 I5纳米粒子修饰后，PCE从19.88%提高到22.03%，填充因子从74.09%提高到82.21%。结果表明，钙钛矿薄膜与Cs3 Cu 2 I5纳米晶之间发生了固态互扩散过程，提高了纳米晶的结晶度，减少了界面复合损失，增强了PSC中的界面载流子输运。特别是，Cs3 Cu 2 I5纳米碳在钙钛矿薄膜中的元素分布影响钙钛矿晶格中离子缺陷钝化的有效性。PSC装置在高湿度条件下504 h后保留其初始PCE的91.6%。这项工作展示了使用特征钙钛矿NC的界面工程策略，其提供了实现高性能PSC的钝化方法。
Ion defects at surface and grain boundaries (GBs) of perovskite films are paramount factors that influence the power conversion efficiency (PCE) of organic–inorganic hybrid perovskite solar cells (PSCs). Various methods have been proposed to solve the problems, but it still remains a great challenge because of the sophisticated and multiplicity of these defects. Herein, a modification method is developed that all-inorganic low-dimensional cesium copper halide nanocrystals (Cs3Cu2I5 NCs) are introduced to reduce the ionic defects of perovskite films at the surface and GBs. The champion device modified by Cs3Cu2I5 NCs exhibits remarkable promotion of PCE from 19.88% to 22.03% and fill factor from 74.09% to 82.21%. The results show that the solid-state interdiffusion process occurs between the perovskite films and Cs3Cu2I5 NCs, which can improve the crystallinity, reduce interfacial recombination loss, and enhance the interfacial carrier transport in PSCs. Especially, the element distribution of Cs3Cu2I5 NCs in perovskite films affects the effectiveness of ionic defects passivation in the perovskite lattice. The PSCs device retains 91.6% of its initial PCE after 504 h under high moisture conditions. This work demonstrates an interfacial engineering strategy using the characteristic perovskite NCs, which provides a passivation method to achieve the high-performance PSCs.