Cs3Cu2I5纳米晶体的界面改性工程用于高效稳定的钙钛矿太阳能电池,Solar RRL

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Cs3Cu2I5纳米晶体的界面改性工程用于高效稳定的钙钛矿太阳能电池
Solar RRL ( IF 6.0 ) Pub Date : 2022-03-08 , DOI: 10.1002/solr.202200025
Le Liu ₁ , Donglei Zhou ₁ , Lu Zi ₁ , Rui Sun ₁ , Shuainan Liu ₁ , Bin Liu ₁ , Zhichong Shi ₁ , Dali Liu ₁ , Hongwei Song ₁

Affiliation

钙钛矿薄膜表面和晶界 (GBs) 的离子缺陷是影响有机-无机杂化钙钛矿太阳能电池 (PSC) 功率转换效率 (PCE) 的最重要因素。已经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，它仍然是一个巨大的挑战。在此，开发了一种改性方法，即引入全无机低维卤化铯铜纳米晶（Cs ₃ Cu ₂ I ₅ NCs）以减少钙钛矿薄膜表面和GBs的离子缺陷。_{Cs 3} Cu ₂ I ₅改性的冠军器件NCs表现出PCE从19.88%到22.03%的显着提升，填充因子从74.09%到82.21%。_{结果表明，钙钛矿薄膜与Cs 3} Cu ₂ I ₅ NCs之间发生固态相互扩散过程，可以提高PSCs的结晶度，降低界面复合损失，增强界面载流子传输。_{特别是Cs 3} Cu ₂ I ₅的元素分布钙钛矿薄膜中的 NC 会影响钙钛矿晶格中离子缺陷钝化的有效性。PSCs 设备在高湿度条件下 504 小时后保留了 91.6% 的初始 PCE。这项工作展示了一种使用特征钙钛矿 NC 的界面工程策略，它提供了一种钝化方法来实现高性能 PSC。

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Interfacial Modification Engineering with Cs3Cu2I5 Nanocrystals for Efficient and Stable Perovskite Solar Cells

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.

更新日期：2022-03-08

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