Enhanced solar cell stability by hygroscopic polymer passivation of metal halide perovskite thin film†,Energy & Environmental Science

当前位置： X-MOL 学术 › Energy Environ. Sci. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Enhanced solar cell stability by hygroscopic polymer passivation of metal halide perovskite thin film†
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2018-07-02 00:00:00 , DOI: 10.1039/c8ee01101j
Min Kim _{1,

2,

3,

4} , Silvia G. Motti _{1,

2,

3,

4,

5} , Roberto Sorrentino _{1,

2,

3,

4,

5} , Annamaria Petrozza _{1,

2,

3,

4}

Affiliation

Long-term device stability is one of the most critical issues that impede perovskite solar cell commercialization. Here we show that a thin layer of a functional hygroscopic polymer, poly(ethylene oxide), PEO, on top of the perovskite thin film, can make perovskite-based solar cells highly stable during operation and in a humid atmosphere. We prove that PEO chemically interacts with lead ions on the perovskite surface, and thus passivates undercoordinated defect sites. Importantly, defect healing by PEO not only results in an improvement of the photo-voltage but also makes the perovskite thin film stable. We demonstrate that the hygroscopic PEO thin film can prevent water inclusion into the perovskite film by screening water molecules, thus having a multi-functional role. Overall, such interface engineering leads to highly durable perovskite solar cells, which, in the presence of PEO passivation, retained more than 95% of their initial power conversion efficiency over 15 h illumination, under load, in ambient atmosphere without encapsulation. Our findings experimentally reveal the role of interface engineering in mastering the instability of perovskite materials and propose a general approach for improving the reliability of perovskite-based optoelectronic devices.

中文翻译：

通过金属卤化物钙钛矿薄膜的吸湿性聚合物钝化增强太阳能电池的稳定性†

长期的器件稳定性是阻碍钙钛矿太阳能电池商业化的最关键问题之一。在这里，我们显示了钙钛矿薄膜顶部的功能性吸湿性聚合物聚环氧乙烷PEO薄层可以使钙钛矿基太阳能电池在运行过程中和在潮湿环境中高度稳定。我们证明，PEO与钙钛矿表面上的铅离子发生化学反应，从而钝化了配位不足的缺陷部位。重要的是，通过PEO进行的缺陷修复不仅导致光电压的提高，而且使钙钛矿薄膜稳定。我们证明了吸湿性PEO薄膜可以通过筛选水分子来防止水混入钙钛矿薄膜中，因此具有多功能的作用。全面的，此类界面工程可产生高度耐用的钙钛矿型太阳能电池，在存在PEO钝化的情况下，在有负载的情况下，在无封装的情况下，在有负载的情况下，经过15 h的照明，其初始功率转换效率可保持95％以上的初始功率转换效率。我们的发现通过实验揭示了界面工程在掌握钙钛矿材料的不稳定性方面的作用，并提出了一种提高基于钙钛矿的光电器件可靠性的通用方法。

更新日期：2018-07-02

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11