Stable and High-Efficiency Methylammonium-Free Perovskite Solar Cells.,Advanced Materials

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Stable and High-Efficiency Methylammonium-Free Perovskite Solar Cells.
Advanced Materials ( IF 27.4 ) Pub Date : 2020-01-27 , DOI: 10.1002/adma.201905502
Xiao-Xin Gao _{1,

2,

3} , Wen Luo _{2,

4} , Yi Zhang ₂ , Ruiyuan Hu ₂ , Bao Zhang ₁ , Andreas Züttel ₄ , Yaqing Feng _{1,

3} , Mohammad Khaja Nazeeruddin ₂

Affiliation

Organic-inorganic metal halide perovskite solar cells (PSCs) have achieved certified power conversion efficiency (PCE) of 25.2% with complex compositional and bandgap engineering. However, the thermal instability of methylammonium (MA) cation can cause the degradation of the perovskite film, remaining a risk for the long-term stability of the devices. Herein, a unique method is demonstrated to fabricate highly phase-stable perovskite film without MA by introducing cesium chloride (CsCl) in the double cation (Cs, formamidinium) perovskite precursor. Moreover, due to the suboptimal bandgap of bromide (Br- ), the amount of Br- is regulated, leading to high power conversion efficiency. As a result, MA-free perovskite solar cells achieve remarkable long-term stability and a PCE of 20.50%, which is one of the best results for MA-free PSCs. Moreover, the unencapsulated device retains about 80% of the original efficiencies after a 1000 h aging study. These results provide a feasible approach to enhance solar cell stability and performance simultaneously, paving the way for commercializing PSCs.

中文翻译：

稳定且高效的无甲基铵钙钛矿太阳能电池。

有机-无机金属卤化物钙钛矿太阳能电池（PSC）通过复杂的成分和带隙工程实现了25.2％的认证功率转换效率（PCE）。但是，甲基铵（MA）阳离子的热不稳定性会引起钙钛矿薄膜的降解，仍然存在器件长期稳定性的风险。在本文中，通过在双阳离子（Cs，甲ami鎓）钙钛矿前体中引入氯化铯（CsCl），证明了一种独特的方法可以在不使用MA的情况下制造高度相稳定的钙钛矿膜。而且，由于溴的最佳带隙（Br-），调节了Br-的量，从而导致高功率转换效率。结果，不含MA的钙钛矿太阳能电池具有出色的长期稳定性，其PCE为20.50％，这是不含MA的PSC的最佳结果之一。此外，经过1000小时的老化研究后，未封装的设备保留了约80％的原始效率。这些结果提供了一种可行的方法来同时增强太阳能电池的稳定性和性能，为PSC的商业化铺平了道路。

更新日期：2020-03-03

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